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Pc200lc-7 shop manual download free

The models integrate the best design solutions that optimize the operational capabilities of the equipment while increasing economic performance, regardless of operating conditions.

Furthermore, all components, mechanisms, and main structural parts of the forklift are made by a Japanese company, which guarantees the high reliability of the equipment. The design features of the forklifts and a wide range of operating temperatures allow the use of equipment indoors and outdoors equally;. Forklift trucks are characterized by high functionality, productivity, and load capacity up to 1.

The special equipment is equipped with an informative control system that guarantees a smooth start even when turning on the spot, confident driving, maneuverability, and quick response to the slightest change in direction;. The carrying capacity of the model is three tons, which allows you to demonstrate high productivity in loading, unloading, and moving goods. Furthermore, the machine, with its significant dimensions, is distinguished by good maneuverability, which is of fundamental importance in confined spaces with poor traffic.

The dual pump system guarantees the successful operation of the steering and high-speed hydraulic systems independently of each other, even at idle.

Having decided to buy a Komatsu FD30T forklift, you will be able to ensure a high level of cargo handling in your warehouse with tangible savings in fuel resources. The forklift has high load capacity and maneuverability and guarantees the fastest and most efficient performance of a large daily volume of tasks. The powerful forklift delivers high performance for successful work in warehouses and indoor and outdoor storage areas.

This is a reliable and productive machine with a nominal load capacity of five tons, which you can buy in our company at an optimally balanced price. Furthermore, the model is equipped with a protective railing for the cab roof, which is located at different levels with the carrier frame, so the operator has all the conditions for comfortable and safe work.

A simple and convenient control format is provided by an automatic transmission. An optimized arrangement of controls also facilitates this. In addition, comfortable and safe conditions have been created for the operator, including a presence control system and a comfortable seat with premium cushioning.

Komatsu FD15T is a type of forklift equipped with an L-shaped fork. As a rule, Komatsu FD20T is used to lift various loads. However, in addition to forks, various attachments can also be used on the forklift, which allows you to lift even non-standard loads.

Your email address will not be published. Use of materials placed on this site is allowed only if there is an active link to Truckmanualshub. If you have any questions, please contact us. Functions and Features. Komatsu PC shop manual. Model, Notes. Download Komatsu pc 7 service manual. Open navigation menu. Close suggestions Search Search. User Settings. Skip carousel. Carousel Previous. Carousel Next. What is Scribd? Explore Ebooks. Bestsellers Editors’ Picks All Ebooks. Explore Audiobooks. Bestsellers Editors’ Picks All audiobooks.

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The very first Komatsu forklift was born in After that, inNorth America received its cars and appreciated the Japanese manufacturers. Various engines can be fdee on this equipment: diesel, gas, or gasoline. This factor determines the differences in power and load capacity.

Each type of engine has its advantages and disadvantages. Depending on the modification, Komatsu forklifts can load from shoo to 45 tons.

They can reach speeds of up to Compared with other types of equipment, forklifts are more environmentally friendly, economical, and easy to maintain and manage. The kit includes a hydraulic system that allows you to lift the load even at idle.

Also, the forklift ссылка на страницу be equipped with an additional pc200lc-7 shop manual download free in the form of attachments.

The models integrate the best design solutions that optimize the operational capabilities of the equipment while increasing economic performance, regardless of operating conditions.

Forklift trucks are characterized by high functionality, productivity, and load capacity up to 1. The special equipment is equipped with an informative control system that guarantees a smooth start even when turning on the spot, confident driving, maneuverability, and quick response pc200lc-7 the slightest change in direction. The carrying capacity of the pc200lc-7 shop manual download free is three tons, which allows you to demonstrate high productivity in loading, unloading, and moving goods.

Furthermore, the machine, with its significant dimensions, is distinguished by good maneuverability, which is of fundamental importance in pc200lc-7 shop manual download free spaces with poor traffic. The dual manhal system guarantees the successful operation of the steering and high-speed hydraulic systems independently of each other, even at idle. Having decided to buy a Komatsu Fee forklift, you pc200lc-7 shop manual download free be able to ensure a high level of cargo handling in your warehouse with tangible savings in fuel resources.

The forklift has high load capacity and maneuverability and guarantees the fastest and most efficient performance of pc200lc-7 shop manual download free large pc200lc-7 shop manual download free volume of tasks. The powerful grand theft pc game free download delivers high performance for successful work in warehouses and indoor and outdoor storage areas.

This is a reliable and pc200lc-7 shop manual download free machine with a nominal load capacity of five tons, which you can buy in our company at an optimally balanced price. Furthermore, the model is manuzl with a protective railing for the cab roof, which is located at different levels download 7 + crack the carrier frame, so the operator has all the conditions for comfortable and safe вот ссылка. A simple and convenient control format is provided by an automatic transmission.

An optimized arrangement of controls also facilitates this. In addition, comfortable and safe conditions have been created for the operator, including a presence control system and a comfortable seat with premium cushioning. Komatsu FD15T is a type of forklift equipped with an L-shaped fork. As a rule, Komatsu FD20T is used to lift various loads.

However, in addition to forks, various attachments can also be used on the forklift, which allows you to lift even non-standard loads. Thanks to this, Komatsu FD20T diesel forklifts have wide applications in various fields. Most often, the forklift is used in commercial and industrial warehouses of enterprises, hypermarkets, and warehouse terminals.

Diesel forklift trucks Komatsu FD20T are suitable for moving large and heavy rfee and carrying out loading and unloading operations.

The Komatsu FD35AT forklift has all the features required for long-term trouble-free operation and creates a comfortable and safe environment for operators operating the equipment. This model is no longer in productionso we will briefly present the characteristics:. Hi, Im looking a shop manual of Komatsu PC Do you have it? Your email address will not be published. Use of materials placed on this читать больше is allowed only if there is an active link to Truckmanualshub.

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This shop manual may contain attachments and optional equipment that are not available in your area. Please consult your local Xownload distributor for those items you may require. Materials and specifications are subject to change without notice. For details of the engine, see the Series Engine Shop Manual.

The affected pages are indicated by downllad use of the following marks. It is requested that necessary Mark Indication Action required actions be taken to these pages according to the table below.

Q Page to be newly added Add. Page to be deleted Discard. Pages having no marks are those previously revised or made additions. Time of Time of Time of Time of Time of Mark Pc200lc-7 shop manual download free Mark Page Mark Page Mark Page Mark Page revision revision revision revision revision q 12 9 q 12 9 q 12 9 q 12 9 q 12 6 q 12 6 2 5 5 5 5 5 5 5 5 5 pc200lc-7 shop manual download free 5 5 5 5 5 q 12 5 q 12 q 12 q 12 8 5. Proper service and repair is extremely important for safe machine operation.

The service and repair techniques recommended by Komatsu and described in this manual are gree effective and safe. Some of these techniques require the use of tools specially designed by Komatsu for the specific purpose. Ship prevent injury to workers, the symbol k is used to mark safety precautions in this manual.

The cautions accompanying these symbols should always be followed carefully. If any danger- ous situation arises or may possibly arise, first consider safety, and take the necessary actions to deal with the situation. Decide a place in the repair workshop to keep tools and removed parts. Always keep the tools Mistakes in operation are extremely dangerous.

Smoke only in the areas 1. Before carrying out any greasing or repairs, read provided for smoking. Never smoke while work- all the ссылка given on the decals pc200lc-7 shop manual download free are ing. Do not wear loose work clothes, or clothes pc200lc-7 shop manual download free buttons 7. Before adding oil or making any repairs, park the missing. Always wear safety glasses when pc200lc-7 shop manual download free 8.

Before starting work, lower blade, ripper, bucket parts with a grinder, etc. If welding repairs are needed, always have a this is not possible, insert the safety pin or use trained, experienced welder carry out the work. In addition, be sure to lock all the control welding gloves, apron, hand shield, cap and levers and hang warning signs on them. When disassembling or assembling, support the 4.

When carrying out any operation with two or machine нажмите чтобы перейти blocks, jacks or stands before more workers, always agree читать статью the operating starting work. Always inform your Remove all mud and oil from the steps or other fellow workers before starting any step of the places used to get on and off the machine.

Never jump on or compartment. If it is impossible to use the 5. Pc200lc-7 shop manual download free all tools in good condition and learn the handrails, ladders or steps, use a stand to pro- correct way to use them. Be sure to assemble all parts again in their origi- nal places. When removing the oil filler cap, drain plug or Replace any damaged parts with посмотреть еще parts.

When installing high pressure hoses, make sure The water and oil in the circuits are hot when the that they are not twisted. Damaged tubes are engine is stopped, so be careful not to get dangerous, so be extremely careful when install- burned. Also, check Wait for the oil and water to cool before carry- that connecting parts are correctly installed.

When assembling or installing parts, always use Before starting work, remove the leads from the the specified tightening torques. When installing battery. Always remove the lead pc200lc-7 shop manual download free the nega- protective parts such as guards, or parts which tive terminal first.

When raising heavy components, use a hoist or ticularly careful to check that they are installed увидеть больше. Check that the wire rope, chains and hooks are When aligning two holes, never insert your fin- free from damage.

Be careful not to get your fingers Pc200lc-7 shop manual download free use lifting смотрите подробнее which has ample caught in a hole.

When measuring hydraulic pressure, check that Install the lifting equipment at the correct places. Take care when removing or installing the tracks Do not work with по этой ссылке part still raised by the hoist of track-type machines.

When removing pc200lc-7 shop manual download free track, the track separates When removing covers which are under internal suddenly, so never let anyone stand at either pressure or under pressure from oc200lc-7 spring, end of pc200lc-7 shop manual download free track.

Slowly downloae the pressure, then slowly loosen the bolts to remove. When removing components, be careful not to break or damage the wiring. Damaged wiring may cause electrical fires. When removing piping, stop the fuel or oil from spilling out. If any fuel or oil drips onto the floor, wipe it up immediately. Fuel or oil on the maunal can cause you to slip, or can even start fires. As a general rule, do not use gasoline to wash parts. In particular, use only the minimum of gasoline when washing electrical parts.

Make sure you understand the contents of this manual and use it to full effect at every opportunity. This shop cp200lc-7 mainly contains the necessary technical information for operations performed in a service workshop. For ease of understanding, the manual is divided into the following chapters; these chapters are fur- ther divided into the each main group of components.

It serves not only to pc200lc-7 shop manual download free an under- standing of the structure, but also serves as reference material for troubleshooting. In addition, this section may contain hydraulic circuit diagrams, electric circuit diagrams, and mainte- nance standards. Troubleshooting charts correlating “Problems” with “Causes” are also included in this section. In addition, this section may give the specifications of attachments and options together.

The specifications contained in this shop manual are subject to change at any time and without any advance notice. Use the specifications given in the book with the latest date. They are pc200lc-7 shop manual download free as follows:. Therefore, to deal with So that the shop manual can be of ample practical all repairs for any modelit is necessary that chas- use, important safety and quality portions are sis, engine, electrical and attachment volumes be marked with the http://replace.me/8711.txt symbols.

Get sbop most up-to- Symbol Item Remarks date information before you start any work. See the page number on the bottom of the page. Download windows free for server application jboss technical precau- File the pages in correct order. Following examples show how feee read the page a Caution for preserving standards number. Example 1 Chassis volume : Pc200lc-7 shop manual download free of parts of sys- 10 – 3 4 tems.

Caution necessary Weight when selecting hoisting Item number Manaul and wire, or when working pos- Function ture is important, etc. Consecutive page number for each 3 Places that require special item.

Tightening attention for the tightening torque torque during assembly. Example 2 Engine volume :. Unit number 1. Engine Places where oil, water or 5 Item number 2. Testing and Adjust- Oil, water fuel must be added, and ing winrelais free download capacity. Manyal page number for each Places where oil or water 6 item.

Drain must be drained, and quantity to be drained. Additional pages: Pc200lc-7 shop manual download free pages are indicated by a hyphen – and number after the page number. File as in the example. Example: Added pages Slinging near the edge of the hook may cause k Heavy parts 25 kg or more must be lifted the rope to slip off the hook during hoisting, and with a hoist, etc.

SAD pc200lc-7 shop manual download free Check for existence of another part causing 3 Do not sling a heavy load with one rope alone, interference with the part to be removed. Standard “Z” or “S” twist ropes without galvanizing 4 Do not sling a heavy load with ropes forming a downkoad hanging angle from the hook. Rope diameter Rree load When hoisting a load with two or more ropes, the force subjected to each rope will increase mm kN tons with the hanging angles.

This weight becomes 9. The allowable load value is estimated to be one- sixth or one-seventh of the breaking strength of the rope used.

Accordingly, prepare an oil receiving container. Disconnection 1 Release the residual pressure from the hydrau- lic tank. See Fig. Do not hold rubber cap portion 4.

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Incomplete Project. Material List. Karo q Price. Case Rear 6. Piston Servo piston. Function The rotation and torque transmitted to the Rocker cam 4 has flat surface A, and shoe pump shaft are converted into hydraulic 5 is always pressed against this surface energy, and pressurized oil is discharged while sliding in a circular movement.

Rocker cam 4 brings high pressure oil at cyl- It is possible to change the discharge amount inder surface B with cradle 2 , which is by changing the swash plate angle. Cylinder block 7 is supported to shaft 1 by Piston 6 carries out relative movement in a spline, and shaft 1 is supported by the the axial direction inside each cylinder cham- front and rear bearings. The tip of piston 6 is a concave ball, and The cylinder block seals the pressure oil to shoe 5 is caulked to it to form one unit.

Pis- valve plate 8 and carries out relative rota- ton 6 and shoe 5 form a spherical bearing. This surface is designed so that the oil pressure balance is maintained at a suitable level. The oil inside each cylinder chamber of cylinder block 7 is sucked in and discharged through valve plate 8. Operation 1 Operation of pump i Cylinder block 7 rotates together with shaft 1 , and shoe 5 slides on flat surface A.

When this happens, rocker cam 4 moves along cylindrical surface B, so angle between center line X of rocker cam 4 and the axial direction of cylinder block 7 changes.

Angle is called the swash plate angle. In this way, piston 6 slides on the inside of cylinder block 7 , so a difference between volumes E and F is created inside cylinder block 7. The suction and discharge is car- ried out by this difference F – E.

In other words, when cylinder block 7 rotates and the volume of chamber E becomes smaller, the oil is discharged dur- ing that stroke. On the other hand, the vol- ume of chamber F becomes larger, and as the volume becomes bigger, the oil is sucked in. In actual fact, the swash plate angle never becomes 0. Swash plate angle is changed by servo piston Servo piston 12 moves in a reciprocal movement according to the signal pressure from the PC and LS valves.

This straight line movement is transmitted through rod 13 to rocker cam 4 , and rocker cam 4 , which is supported by the cylindrical surface to cradle 2 , slides in a rotating movement in direction of arrow.

With servo piston 12 , the area receiving the pressure is different on the left and the right, so main pump discharge pres- sure self pressure PP is always brought to the chamber receiving the pressure at the small diameter piston end. Output pressure Pen of the LS valve is brought to the chamber receiving the pressure at the large diameter end. The relationship in the size of pressure PP at the small diameter piston end and pres- sure Pen at the large diameter end, and the ratio between the area receiving the pressure of the small diameter piston and the large diameter piston controls the movement of servo piston Plug PP : Pump port 2.

Locknut PDP : Drain port 3. Piston 8. PP1 : Pump port 1. Servo piston assembly PP2 : Pump pressure pilot port 2. Plug PT : Drain port 3. Pin PM : PC mode selector pressure pilot port 4. Seat 7. Cover 8. When isig changes between 0 and 1A, the set pressure of the spring changes according to this, and the selector point for the pump dis- charge amount changes at the rated central valve between 0. In this way, it carries out equal horsepower control so that the horsepower absorbed by the pump does not exceed the engine horsepower.

In other words, If the load during the opera- tion becomes larger and the pump discharge pressure rises, it reduces the discharge amount from the pump; and if the pump dis- charge pressure drops, it increases the dis- charge amount from the pump. The controller senses the actual speed of the engine, and if the speed drops because of an increase in the load, it reduces the pump the set value, the command current to the PC- discharge amount to allow the speed to EPC valve solenoid from the controller recover.

In other words, when the load increases according to the drop in the engine increases and the engine speed drops below speed to reduce the pump swash plate angle. Pump The LS valve is a three-way selector valve, pressure PP enters the large diameter end of with pressure PLS LS pressure from the the piston from port K and the same pump outlet port of the control valve brought to pressure PP also enters port J at the small spring chamber B, and main pump discharge diameter end of the piston, so the swash plate pressure PP brought to port H of sleeve 8.

The set pressure of the spring changes. Before the engine is started, servo piston 12 is pushed to the right. It is interconnected with the drain circuit through the control valve spool. There- becomes smaller for example, when the area fore, the swash plate moves in the direction of opening of the control valve becomes to make the discharge amount larger.

If piston When spool 6 moves, port D and port E are 7 is pushed to the left, it acts to make the set joined and connected to the PC valve. When pressure of spring 4 weaker, and the differ- this happens, the PC valve is connected to the ence between PLS and PP changes when drain port, so circuit D – K becomes drain ports D and E of spool 6 are connected.

The operation of the PC valve is explained later. When LS because of the difference in area between the differential pressure PLS becomes larger large diameter end and the small diameter for example, when the area of opening of the end of servo piston 12 , servo piston 12 is control valve becomes smaller and pump pushed to the left. This command current acts on the PC- this position.

EPC valve and outputs the signal pres- The size of command current X is deter- sure. When this signal pressure is mined by the nature of the operation received, the force pushing piston 2 is lever operation , the selection of the changed. Piston 2 For the F pump, it is the R pump pressure stops at a position where the combined For the R pump, it is the F pump pressure force pushing spool 3 is balanced, and.

In other words, the spring load is changed by piston 9 extending or compress- ing springs 4 and 6. Self pres- sure PP1 enters port B and the small diame- ter end of servo piston 9 , and other pump pressure PP2 enters port A. When pump pressures PP1 and PP2 are small, spool 3 is on the right. If port E and port G of the LS valve are connected see 1 LS valve , the pressure entering the large diameter end of the piston from port J becomes drain pressure PT, and servo piston 9 moves to the right.

As a result, the pressure at port C rises, and the pressure at the large diameter end of the piston also rises, so the movement of piston 9 to the right is stopped. When load on actuator is large and pump discharge pressure is high When the load is large and pump dis- If main pump pressure PP increases fur- charge pressures PP1 and PP2 are high, ther and spool 3 moves further to the the force pushing spool 3 to the left left, main pump pressure PP1 flows to becomes larger and spool 3 moves to port C and acts to make the discharge the position in the diagram above.

When amount the minimum. When piston 9 this happens, as shown in the diagram moves to the left, springs 4 and 6 are above, part of the pressurized oil from compressed and push back spool 3. When port E and port G of the LS valve The position in which piston 9 stops are connected see 1 LS valve , the pres- when this happens is further to the left sure from port J enters the large diameter than the position when pump pressures end of servo piston 9 , and servo piston PP1 and PP2 are low.

When load on main pump is light If there is a failure in the pump controller, At this point, port C is connected to the turn emergency pump drive switch ON to drain pressure of port D, and the large switch to the resistor side. In this case, the diameter end of the piston of servo piston power source is taken directly from the 9 also becomes the drain pressure PT battery.

But if the current is used as it is, it through the LS valve. When this happens, is too large, so use the resistor to control the pressure at the small diameter end of the current flowing to PC-EPC valve sole- the piston is large, so servo piston 9 noid 1.

If the main pump pressure PP1 and PP2 are low, the combined force of the pump pressure and the force of PC-EPC valve solenoid 1 is weaker than the spring set force, so spool 3 is balanced at a posi- tion to the left. When main pump load is heavy In the same way as in the previous item, and discharge amount Q is determined as when the emergency pump drive switch shown in the diagram for the valve of the is ON, the command current sent to PC- current sent to the PC-EPC valve solenoid EPC valve solenoid 1 becomes constant.

For this reason, the force of piston 2 The curve when the PC prolix switch is pushing spool 3 is constant. ON is curve 2, which is to the left of If main pump pressures PP1 and PP2 curve 1 for when the pump controller is increase, spool 3 moves further to the normal. In this case, the pressure from port A flows to port C, so servo piston 9 moves to the left to make the discharge amount smaller by the same mechanism as explained in item 2 -b, and stops at a position to the left of the position when the load on the pump is light.

In other words, even when the emergency pump drive switch is ON, the curve for the pump pressure PP. Body 5. Spool 6. Plunger PT : To tank 3. Spring 7. The EPC valve consists of the proportional solenoid portion and the hydraulic valve portion. When it receives signal current i from the pump controller, it generates the EPC out- put pressure in proportion to the size of the signal, and outputs it to the LS valve. When signal current is 0 coil deener- gized When there is no signal current flowing from the controller to coil 5 , coil 5 is generalized.

Therefore, the circuit pressure between the EPC valve and the LS valve is controlled in proportion to the size of the signal current. When signal current is maximum coil energized When the signal current flows to coil 5 , coil 5 is energized.

When this happens, the signal current is at its maximum, so the propulsion force of plunger 6 is also at its maximum. For this reason, spool 2 is pushed fully to the left by push pin 4. At the same time, port PT closes and stops the oil from flowing to the tank. Cover 1 3. Cover 2 This control valve consists of a 6-spool 4. Pump merge-divider valve valve unit type , 1 service valves, a pump 5. Back pressure valve merge-divider valve, a back pressure valve, 6.

Boom lock valve and a boom hydraulic drift prevention 7. Service valve valve. Since all the valves are assembled together with connecting bolts and their passes are connected to each other inside the assem- bly, the assembly is small in size and easy to maintain. Since one spool of this control valve is used for one work equipment unit, its struc- ture is simple. Unload valve 9. Pressure compensation valve Service 2. Pressure compensation valve Arm OUT Pressure compensation valve Right travel Pressure compensation valve Left travel for- Reverse ward 4.

Pressure compensation valve Left swing Pressure compensation valve Right swing 6. Pressure compensation valve Left travel Pressure compensation valve Right travel reverse forward 7.

Pressure compensation valve Arm IN 8. Pressure compensation valve Service Main relief valve. Spool Arm 6. Spool Bucket 2. Spool Right travel 7. Spool Service 3. Spool Swing 8. Unload valve 4. Spool Boom 9. Main relief valve 5. Spool Left travel Spool return spring.

Safety-suction valve Arm OUT Safety-suction valve Arm IN 2. Suction valve Right travel reverse LS shuttle valve Arm 3. LS shuttle valve Right travel 4. Suction valve Left travel reverse LS select valve 5. LS shuttle valve Boom 6. Safety-suction valve Service LS shuttle valve Left travel 7. Safety-suction valve 2-stage Service LS shuttle valve Bucket 8. LS shuttle valve Service 9. Suction valve Left travel forward LS check valve Pressure relief plug Suction valve Right travel forward.

Standard size Repair limit Free length x Installed Installed Free Installed If damaged or 22 Check valve spring Outside diameter length load length load deformed, replace spring 1. Unload valve 5. Safety-suction valve 2. Main relief valve 6. Spool Suction valve 3. Safety valve Boom 7. Pressure compensation valve Pressure compensation valve 4. Lift check valve 8.

LS shuttle valve Reverse LS shuttle valve 9. Pressure compensation valve IN Forward Safety-suction valve Suction valve Check valve for regeneration cir- cuit. Safety-suction valve 7. Spool 8. Spool 3. Pressure compensation valve DUMP 9. LS shuttle valve LS shuttle valve 5. Pressure compensation valve CURL Pressure compensation valve 6. Safety-suction valve. Spool 5. Suction valve 2. Pressure compensation 6. Pump merge-divider valve valve Left 7.

Pressure compensation Travel junction valve 3. Return spring 4. Pressure compensation 8. Hydraulic drift prevention Suction valve valve Right valve Spool 9.

Pressure compensation Pressure compensation valve Reverse valve Lower Check valve for regeneration valve Forward circuit Suction valve. LS bypass plug 2. Main relief valve Screw 3. Pump merge-divider valve Main Poppet 4.

Return spring Spring Pressure reducing valve pilot 5. Pump merge-divider valve For LS Spring Pressure reducing valve main 6. Valve Pressure reducing valve 7. Valve Sequence valve Spring Safety valve 8. Spring Sequence valve Distributor and confluence valve Left 7. Pressure compensation valve Travel junction valve 3.

The relief valve set pressure is set to 2 stages. When power is needed, pilot pressure P is turned ON and the pressure is set to high pressure. The relief valve set pressure is determined by the installed load of spring 1. First stage It is unnecessary to set the first and second stage individually. The second stage is set when the first stage is set.

When pilot pressure P is ON: High-pressure setting In addition to the installed load of spring 1 , pilot pressure P is applied to poppet diameter d1, so the set pressure becomes higher.

Spring 3. Sleeve It is possible to adjust the division of the oil 4. Poppet flow to the service valve when the service 5. Spring valve for attachment is operated together 6. Locknut etc. Plastic cap Variable in proportion to surface area The pump pressure leaving the service valve SS. From service valve spool spool acts on the left end of valve 1 , and at CP. Cylinder port the same time passes through throttle a and LS.

Load pressure from other work equipment enters chamber g. The maximum LS pressure passes through throttle d and enters chamber e. At the same time, the cylinder port pressure passes through passage c and throttle f, and goes to chamber h. In addition, the force of spring 2 acts on valve 1 , and the force of spring 5 acts on poppet 4.

The force of spring 5 can be adjusted with screw 6. The pump pressure and LS pressure are determined by the pressure of the other work equipment, but the cylinder port pressure becomes the actuating pressure of the attach- ment. If the difference between pump pressure P and the cylinder pressure becomes greater than the force of spring 5 , poppet 4 is pushed to the right and the passage opens, so the pump passage is connected to the cyl- inder port through throttle a, chamber g, and passages b and c, and the oil flows to the cyl- inder port.

Basic principle 1 Control of pump swash plate The pump swash plate angle pump dis- charge amount is controlled so that LS dif- ferential pressure PLS the difference between pump pressure PP and control valve outlet port LS pressure PLS load pressure of actuator is constant. If LS differential pressure PLS becomes lower than the set pressure of the LS valve when the actuator load pressure is high , the pump swash plate moves towards the maximum position; if it becomes higher than the set pressure of the LS valve when the actuator load pressure is low , the pump swash plate moves towards the min- imum position.

When engine is stopped Poppet 11 is pressed by spring 12 against the seat and port PR is not connected to TS. Valve 14 is pressed by spring 13 against the left side and port P2 is connected to PR. Valve 7 is pressed by spring 8 against the left side and port P2 is not connected to A2. When in neutral or load pressure P2 is low When boom is lowered and arm is in IN position and they are moving down under own weight Note: When load pressure A2 is lower than self-pres- sure reducing valve output pressure PR.

If the PR pressure rises above the set level, poppet 11 opens and the hydraulic oil flows from the PR port through orifice “a” in spool 14 and open part of poppet 11 to seal drain port TS. Accordingly, differential pressure is gener- ated between before and after orifice “a” in spool 14 and then spool 14 moves to close the pass between port P2 and PR.

The P2 pressure is controlled constant at the set pressure by the area of the oil pass at this time and supplied as the PR pressure. When load pressure P2 is high If load pressure A2 rises and the pump dis- charge increases because of operation of the work equipment, the dx P2 pressure rises higher than the total of the force of spring 8 and the value of d x PR pressure, and then valve 7 moves to the right stroke end. As a result, the area of the pass between ports P2 and A2 increases and the pass resis- tance lowers and the loss of the engine power is reduced.

If the PR pressure rises above the set pres- sure, poppet 11 opens and the hydraulic oil flows from the PR port through orifice “a” in spool 14 and open part of poppet 11 to seal drain port TS. When abnormally high pressure is generated If the PR pressure on the self-pressure reducing valve rises high abnormally, ball 16 separates from the seat against the force of spring 15 and the hydraulic oil flows from output port PR to TS. Accord- ingly, the PR pressure lowers.

By this oper- ation, the hydraulic devices PPC valves, solenoid valves, etc. Safety valve set pressure Brake release pressure 1. Brake spring 8. Housing Safety valve 2. Drive shaft 9.

Check valve 3. Spacer Cylinder block Check valve spring 4. Case Valve plate Shuttle valve 5. Disc Reverse prevention valve Shuttle valve spring 6. Plate Center shaft 7. Brake piston Center spring. Operation of swing lock 1. When swing lock solenoid valve is deacti- vated When the swing lock solenoid valve is deacti- vated, the pressurized oil from the main pump is shut off and port B is connected to the tank cir- cuit.

As a result, brake piston 7 is pushed down by brake spring 1 , discs 5 and plates 6 are pushed together, and the brake is applied. When swing lock solenoid valve is excited When the swing lock solenoid valve is excited, the valve is switched and the pressure oil from the main pump enters port B and flows to brake chamber a. The pressure oil entering chamber a overcomes brake spring 1 and pushes brake piston 7 up.

As a result, discs 5 and plates 6 are separated and the brake is released. Function When the swing is stopped, the outlet port circuit of the motor from the control valve is closed, but the motor continues to rotate under inertia, so the pressure at the output side of the motor becomes abnormally high, and this may damage the motor. To prevent this, the abnormally high pres- sure oil is relieved to port S from the outlet port of the motor high-pressure side to prevent any damage.

Operation 1 When starting swing When the swing control lever is operated to swing right, the pressure oil from the pump passes through the control valve and is supplied to port MA.

With the oil from the outlet port of the motor, the return circuit to the tank is closed by the control valve , so the pressure at port MB rises.

The oil pressure rises further until it reaches the set pressure of relief valve 1. As a result, a high braking torque acts on the motor and stops the motor. This prevents cavitation at port MA. Valve body 2. Spool MA side 3. Spring MA side 4. Plug 5. Spool MB side 6. Spring MB side 7. Outline This valve reduces the swing back genera- tion in the swing body by the inertia of the swing body, the backlash and rigidity of the machinery system, and the compression of the hydraulic oil when the swing is stopped.

This is effective in preventing spillage of the load and reducing the cycle time when stopping the swing the posi- tioning ability is good and it is possible to move swiftly to the next job.

When this happens, pressure MA is below the set pressure of spring 3 , so spool 2 does not move. For this reason, the pres- sure oil is closed by spool 2 , and the brak- ing force is ensured.

Pressure MA goes to chamber a, so spool 2 pushes spring 3 and moves to the right, and MA is con- nected to B. At the same time, b is con- nected to f through the drill hole in spool 5 , so the reversal pressure at port MA is bypassed to port T to prevent the 2nd reversal. Cover A1. To tank 2. Body A2. From control valve port A5 T1. From L. Slipper seal C1. From control valve port B2 4. O-ring B2. From control valve port B5 B1.

Shaft D1. From control valve port A2 E. Check Item Criteria Remedy. Regulator piston 9. Check valve spring Valve plate 2. Spring Output shaft Counterbalance valve 3.

Fulcrum a of rocker cam 4 is eccentric to point of force b of the combined force of the propulsion force of cylinder 6 , so the com- bined force of the piston propulsion force acts as a moment to angle rocker cam 4 in the direction of the maximum swash plate angle. When the solenoid valve is excited, the pilot pressure oil from the main pump flows to port P, and pushes regulator valve 9 to the left direction of the arrow.

Because of this, the main pressure oil from the control valve passes through passage d in regulator valve 9 , enters regulator piston 15 at the bottom, and pushes regulator pis- ton 15 to the right in the direction of the arrow. As a result, rocker cam 4 moves in the mini- mum swash plate angle direction, the motor capacity becomes minimum. It overcomes the force of spring 11 , and SJP pushes piston 12 to the left in the direc- tion of the arrow.

OR When this happens, the force pushing plate 13 and disc 14 together is lost, so plate 13 and disc 14 separate and the brake is released. When stopping travel When the travel lever is placed in neutral, counterbalance valve spool 19 returns to the neutral position and the circuit to the parking brake is closed. The pressurized oil in chamber A of brake piston 12 is drained to the case from the orifice in the brake piston, and brake piston SJP 12 is pushed to the right in the direction of the arrow by spring OR As a result, plate 13 and disc 14 are pushed together, and the brake is applied.

To prevent this these valves act to make the machine travel according to the engine speed pump discharge amount. Operation when pressure oil is supplied When the travel lever is operated, the pres- surized oil from the control valve is sup- plied to port PA. However, the motor outlet port is closed by suction safety valve 18B and spool 19 , so the pressure at the supply side rises.

The pressurized oil at the supply side flows from orifice E1 and E2 in spool 19 to chamber S1. When the pressure in cham- ber S1 goes above the spool switching pressure, spool 19 is pushed to the right in the direction of the arrow. As a result, port MB and port PB are con- nected, the outlet port side of the motor is opened, and the motor starts to rotate.

Operation of brake when traveling downhill If the machine tries to run away when travel- ing downhill, the motor will turn under no load, so the pressure at the motor inlet port will drop, and the pressure in chamber S1 through orifices E1 and E2 will also drop.

When the pressure in chamber S1 drops below the spool switching pressure, spool 19 is returned to the left, in the direction of the arrow by spring 20 , and outlet port MB is throttled. As a result, the pressure at the outlet port side rises, resistance is generated to the rota- tion of the motor, and this prevents the machine from running away. In other words, the spool moves to a position where the pressure at the outlet port MB bal- ances the pressure at the inlet port and the force generated by the weight of the machine.

It throttles the outlet port circuit and controls the travel speed according to the amount of oil discharged from the pump. The safety valve acts to release this abnormal pressure and send it to the inlet port side of the motor to prevent damage to the equipment. Operation 1. When travel is stopped or when travel- ing downhill, rotating to right When the motor inlet port pressure pressure PA goes down, the pressure in chamber S1 also goes down. When it goes below the switching pressure of the spool, spool is returned to the left by spring 20 , and outlet port passage B1 is throttled.

When this hap- pens, the motor continues to rotate under inertia, so the outlet pressure pressure MB rises. The oil then passes through large notch A1 in counterbalance valve spool 19 and flows to chamber MA in the circuit on the opposite side.

Function Operation This valve connects both travel circuits to each When pilot pressure is turned ON other so that the hydraulic oil will be supplied If the pilot pressure from the travel junction sole- evenly to both travel motors and the machine will noid valve becomes higher than the force of travel straight. When pilot pressure is turned OFF If pilot pressure PST from the sole- If the oil flow rates in both travel motors noid valve is 0, travel junction spool become different from each other, the oil 13 is pressed by the force of spring flows through the route between port PTL, 14 against the right side and the travel junction spool 13 , and port PTR so pass between ports PTL and PTR is that the oil flow rates will be equalized again.

When travel lever is operated If the right travel lever is set in the reverse or At this time, the right travel reverse or for- forward direction, the right travel reverse or ward PPC pressure is applied through orifice forward PPC pressure pushes spool 7 to the 6 of piston 4 to the left end of piston 8 to left or right. Travel PPC valve 8.

Service PPC valve 9. Service pedal Spool 7. Joint 2. Metering spring 8. Plate 3. Centering spring 9. Retainer 4. Filter 6. Nut For connection of lever Unit: mm. When this happens, fine control hole f is shut off from drain chamber D, and at almost the same time, it is connected to pump pressure chamber PP, so pilot pres- sure oil from the main pump passes through fine control hole f and goes from port P1 to port A. When the pressure at port P1 becomes higher, spool 1 is pushed back and fine control hole f is shut off from pump pres- sure chamber PP.

At almost the same time, it is connected to drain chamber D to release the pressure at port P1. When this happens, spool 1 moves up or down so that the force of metering spring 2 is bal- anced with the pressure at port P1. The relationship in the position of spool 1 and body 10 fine control hole f is at a point midway between drain hole D and pump pressure chamber PP does not change until retainer 9 contacts spool 1. Therefore, metering spring 2 is com- pressed proportionally to the amount of movement of the control lever, so the pres- sure at port P1 also rises in proportion to the travel of the control lever.

In this way, the control valve spool moves to a position where the pressure in chamber A the same as the pressure at port P1 and the force of the control valve spool return spring are balanced.

When this happens, fine control hole f is connected to drain chamber D and the pressure oil at port P1 is released. If the pressure at port P1 drops too far, spool 1 is pushed down by metering spring 2 , and fine control hole f is shut off from drain chamber D. At almost the same time, it is connected to pump pressure chamber PP, and the pump pressure is sup- plied until the pressure at port P1 recovers to a pressure that corresponds to the lever position.

When the spool of the control valve returns, oil in drain chamber D flows in from fine control hole f in the valve on the side that is not working. The oil passes through port P2 and enters chamber B to fill the chamber with oil. Therefore, the pilot pressure oil from the main pump passes through fine control hole f and flows to chamber A from port P1, and pushes the control valve spool.

The oil returning from chamber B passes from port P2 through fine control hole f and flows to drain chamber D. Plate 6. Centering spring 2. Body 7. Valve 3. Damper 4. Collar 9. Steering signal 5. Metering spring Steering signal valve spring. Spool 1 is also pushed by metering spring 2 , and moves down. When this happens, fine control hole f is shut off from drain chamber D.

At almost the same time, it is connected to pump pressure chamber PP, and the pilot pres- sure of the main pump is sent from port A through fine control hole f to port P1. When the pressure at port P1 rises, spool 1 is pushed back. Fine control hole f is shut off from pump pressure chamber PP. At almost the same time, it is connected to drain chamber D, so the pressure at port P1 escapes. As a result, spool 1 moves up and down until the force of metering spool 2 is bal- anced with the pressure at port P1.

The relationship of the position of spool 1 and body 10 fine control hole f is in the middle between drain hole D and pump pressure chamber PP does not change until retainer 9 contacts spool 1.

Therefore, metering spring 2 is com- pressed in proportion to the travel of the control lever, so the pressure at port P1 also rises in proportion to the travel of the control lever.

In this way, the spool of the control valve spool moves to a position where the pressure of chamber A same as pressure at port P1 and the force of the return spring of the control valve spool are balanced. Because of this, fine control hole f is con- nected to drain chamber D, and the pressur- ized oil at port P1 is released. If the pressure at port P1 drops too much, spool 1 is pushed up by metering spring 2 , so fine control hole f is shut off from drain chamber D.

At almost the same time, it is connected to pump pressure chamber PP, so the pressure at port P1 supplies the pump pressure until the pressure recovers to a pres- sure equivalent to the position of the lever.

When the control valve returns, oil in drain chamber D flows in from fine control hole f’ of the valve on the side that is not moving. It passes through port P2 and goes to cham- ber B to charge the oil. Fine control hole f is shut off from drain chamber D, and is connected to pump pressure chamber PP. Therefore, the pilot pressure oil from the main pump passes through fine control hole f and flows to chamber A from port P1 to push the control valve spool.

The return oil from chamber B passes from port P2 through fine control hole f’ and flows to drain chamber D. Accordingly, if the machine is traveling is judged by the signal of port P5. Steering signal If the operation quantities of both levers are different from each other as in the steering operation, the higher one of the PPC output pressures on both sides is output as the steering signal.

Any signal is not output from port P6 while the machine is travelling straight forward or reverse or in neutral. Accordingly, if the machine is being steered is judged by the signal of port P6. While the left motor is operating for forward travel the signal of port P2 is output and the right motor is also operating for forward travel the signal of port P4 is output , the pressures in left spring chamber k and right spring chamber l of steering signal valve j are set high.

In the case of the following drawing, the pressure in left spring chamber k of steering signal valve j is P2. The pressure in right spring chamber l is P4.

While the left motor is operating for reverse travel the signal of port P1 is output and the right motor is operating for forward travel the signal of port P4 is output , only the pressure in right spring chamber l of steering signal valve j is set high. Accordingly, the steering signal valve moves to the left and outputs the steering signal port P6. Spool 2. Metering spring 3. Centering spring 4. Piston 5. Lever 6.

Retainer 8. Ports A and B of the control valve and ports a and b of the PPC valve are con- nected to drain port T through fine control hole X of spool 1.

When lever 5 is moved, metering spring 2 is pushed by piston 4 and retainer 7 , and spool 1 is pushed down by this. As a result, fine control portion Y is con- nected with port a, and the pressurized oil from port P flows from port a to port A of the control valve. When the pressure at port a becomes higher, spool 1 is pushed back by the force acting on the end of the spool, and fine control portion Y closes.

As a result, spool 1 moves up and down to balance the force at port a and the force at metering spring 2. Therefore, metering spring 2 is com- pressed in proportion to the amount the control lever is moved. The spring force becomes larger, so the pressure at port a also increases in proportion to the amount the control lever is operated. In this way, the control valve spool moves to a position where the pressure of port A the same as the pressure at port a is bal- anced with the force of the return spring of the control valve spool.

Merge-divider solenoid valve tion valve ACC: To accumulator 4. Travel speed solenoid valve A3. To main valve Merge- 5. Swing brake solenoid valve divider valve 6. Connector 2. Moving core 3. Coil 4. Block 6. Since the signal current does not flow from the controller, solenoid 3 is turned off. Accordingly, spool 4 is pressed by spring 6 against the left side. By this operation, the pass from P to A is closed and the hydraulic oil from the main pump does not flow into the actuator.

At this time, the oil from the actuator is drained through ports A and T into the tank. The signal current flows from the controller to solenoid 3 , and the latter is turned on. Accordingly, spool 4 is pressed against to the right side. By this operation, the hydraulic oil from the main pump flows through port P and spool 4 to port A, then flows into the actuator. At this time, port T is closed and the oil does not flow into the tank. Gas plug 2.

Shell 3. Holder 2 5. Bladder 6. Oil port. Drain plug Rated pressure: 6. Case Relief valve cracking pressure: 4. Head cover 0. The main hydraulic oil is shut off from the Function holding pressure on the boom cylinder bot- This valve prevents the oil in the boom cylin- tom side. The total of this pressure 1. When boom lever is in “RAISE” position If the boom lever is set in the “RAISE” posi- and the force of spring 4 closes poppet 5 to tion, the pressure of the main hydraulic oil is shut off the main hydraulic oil from the hold- applied toward the left to area “A” of the ring ing pressure on the boom cylinder bottom.

At this time, If the boom lever is set in the “LOWER” posi- if this pressure is higher than the force of tion, pilot spool 2 is pushed by the pilot spring 4 , poppet 5 moves to the left. By this pressure from the PPC valve and the hydrau- operation, the main hydraulic oil from the lic oil in chamber “b” in the poppet is drained control valve flows through the open part of through orifice “c”. The oil on the boom bottom side flows from 2.

When boom lever is in neutral orifice “a” through chamber “b” and orifice “c” If the control lever is returned to the neutral to the drain hole, and the oil pressure in position while the boom is raised, the oil in chamber “b” lowers. If the hydraulic drift prevention valve for the 4. When abnormally high pressure is gener- arm cylinder head circuit is installed ated optional , the hydraulic oil in the boom cylin- If abnormally high pressure is generated in der bottom circuit or that in the arm cylinder the boom cylinder bottom circuit, the hydrau- head circuit, having higher pressure, pushes lic oil in port B pushes check valve 6 open, check valve 6 or 6A open, then safety valve then safety valve 3 operates.

This valve applies back pressure to the drain circuit to prevent generation of negative pres- sure on the hydraulic devices for the work equipment motors, cylinders, etc. While engine is stopped Any oil is not supplied from the pump to the self-pressure reducing valve and valve 1 is pressed by only the force of spring 2 toward the right and drain circuit “a” of the control valve is connected through orifice “b” of valve 1 to port T.

While engine is running Output pressure PR of the self-pressure reducing valve is applied through the con- trol valve to spring chamber “c” of the back pressure valve. Output pressure PR applied to spring chamber “c” is applied to the left end of valve 1 area of d to push valve 1 to the right. At this time, pressure PA of drain circuit “a” of the control valve is applied to the right end of valve 1 area of d1 to push valve 1 to the left. Valve 1 is balanced so that the back pres- sure PA will be as follows.

Spool V : To control valve 2. When a breaker is installed, the return oil from the breaker does not pass through the main valve, but returns directly to the hydraulic tank. When other attachments crusher, etc. When attachment other than breaker is installed Spool 1 is pushed fully to the left by the force of spring 2 , ATT port and port V are interconnected, and ATT port and port T are shut off, so the attachment and main valve are interconnected.

When breaker is installed When the pilot pressure from the attachment circuit selector solenoid valve overcomes the force of spring 2 , the spool 1 moves fully to the right. ATT port and port V are shut off and ATT port and port T are interconnected, so the oil returning from the breaker does not pass through the main valve, but passes through port T and returns directly to the hydraulic tank. Standard Tolerance Standard clear- Clearance Clearance between connecting size ance limit Shaft Hole 1 pin and bushing of revolving frame and boom Clearance between connecting Arm as individual part 0 Hot water pickup piping A.

Fresh air 2. Air conditioner compressor B. Recirculated air 3. Refrigerant piping C. Condenser 5. Receiver tank 6. Hot water return piping 7. Air conditioner unit 8. Battery relay 2. Battery The engine can be started and stopped with 3.

Starting switch only starting switch 3. Fuel control dial The engine throttle and pump controller 7 5. Linkage reveives the signal of fuel control dial 4 and 6. Starting motor transmits the drive signal to governor motor 7.

Engine throttle and pump controller 9 to control the governor lever angle of fuel 8. Fuel injection pump injection pump 8 and control the engine 9. Governor motor speed. Engine speed control The fuel control dial sends a signal to the engine throttle and pump controller according to the position of the dial.

The engine throttle and pump controller calcu- lates the angle of the governor motor according to this signal, and sends a signal to drive the governor motor so that it is at that angle. When this happens, the operating angle of the governor motor is detected by the potentiometer, and feedback is sent to the engine throttle and pump controller, so that it can observe the operation of the governor motor. When this happens, to maintain the electric power in the system until the engine stops completely, the engine throttle and pump controller itself drives the battery relay.

Knob 2. Dial 3. Spring 4. Ball 5. Potentiometer 6. Function The fuel control dial is installed under the monitor panel, and a potentiometer is installed under the knob. The potentiome- ter shaft is turned by turning the knob. As the potentiometer shaft is turned, the resistance of the variable resistor in the potentiometer changes and a throttle sig- nal is sent to the engine throttle and pump controller.

The hatched area in the graph shown at right is the abnormality detection area. Potentiometer A potentiometer for feedback is installed to 2.

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Description: Pc Flag for inappropriate content. Download now. Original Title: Service Manual Pc 7 1. Jump to Page. Search inside document. Related Interests Manufactured Goods. Manufactured Goods. Sk70sr-1es Shop Manual. Shop manual PC 8 ing. Grit: The Power of Passion and Perseverance.

Yes Please. Doosan Basic Excavator Training. Komatsu Pump. Sany Excavators SYC. Principles: Life and Work. Fear: Trump in the White House. Unit: mm. Check item Criteria Remedy. Backlash between No. Swing pinion No. Spacer 3. Case 4. Ring gear 7. Swing motor 9. Oil level gauge Drain plug. Backlash between swing motor shaft and Standard clearance Clearance limit 14 No.

Swing circle inner race No. Ball 3. Swing circle outer race. Reduction ratio: a. Outer race soft zone S position. Axial clearance of bearing Standard clearance Clearance limit 4 Replace when mounted on chassis 0. Inner race soft zone S position 13 b. Amount of grease: Link pitch mm mm mm mm. Standard Tolerance Repair limit size 10 Vertical width of idler guide Track frame Rebuild or Idler support replace Horizontal width of idler Track frame 11 guide Idler support Standard size Repair limit.

PCLC-7 Standard size Repair limit 1 Outside diameter of protruding Standard size Repair limit 1 Outside diameter of flange Standard clearance Clearance limit 8 Axial clearance of roller 0.

Triple-grouser shoe 3. Swamp shoe 2. Road liner 4. Flat shoe. No Check item Criteria Remedy. Standard size Repair limit 1 Link pitch Standard size Repair limit 3 Link height 97 Repair or replace Thickness of link metal 4 Regular 2. Protrusion of Regular 4. Overall length of Regular 13 pin Master Overall length of Regular Standard Tightening torque Additional tightening Lower limit torque b.

Standard Tolerance Standard Clearance between master pin size Shaft Hole clearance 25 and bushing Standard size Repair limit Lug welding, Height of Triple-grouser rebuild or 26 16 replace grouser Road liner 70 25 Replace. Standard size Repair limit 1 Height 26 Bucket cylinder 2. Arm cylinder 3. Boom cylinder 4. Hydraulic tank 5. Hydraulic filter 6. Swing motor 8. Hydraulic pump 9.

Control valve Oil cooler Multi-pattern selector valve PPC valve Lock lever electric type Center swivel joint Travel PPC valve Attachment circuit selector valve Holding valve Accumulator Hydraulic tank Tank capacity: l 3. Oil filler cap Amount of oil inside tank: l 4. Filter element Pressure valve 5. Strainer Relief cracking pressure: 6.

Bypass valve Shaft Front 7. Cylinder block 2. Cradle 8. Valve plate 3. Case Front 9. End cap 4. Rocker cam Shaft Rear 5.

Shoe Case Rear 6. Piston Servo piston. Function The rotation and torque transmitted to the Rocker cam 4 has flat surface A, and shoe pump shaft are converted into hydraulic 5 is always pressed against this surface energy, and pressurized oil is discharged while sliding in a circular movement.

Pis- valve plate 8 and carries out relative rota- ton 6 and shoe 5 form a spherical bearing. This surface is designed so that the oil pressure balance is maintained at a suitable level.

The oil inside each cylinder chamber of cylinder block 7 is sucked in and discharged through valve plate 8. Operation 1 Operation of pump i Cylinder block 7 rotates together with shaft 1 , and shoe 5 slides on flat surface A. When this happens, rocker cam 4 moves along cylindrical surface B, so angle between center line X of rocker cam 4 and the axial direction of cylinder block 7 changes. Angle is called the swash plate angle.

In this way, piston 6 slides on the inside of cylinder block 7 , so a difference between volumes E and F is created inside cylinder block 7. The suction and discharge is car- ried out by this difference F – E.

In actual fact, the swash plate angle never becomes 0. Swash plate angle is changed by servo piston Servo piston 12 moves in a reciprocal movement according to the signal pressure from the PC and LS valves. This straight line movement is transmitted through rod 13 to rocker cam 4 , and rocker cam 4 , which is supported by the cylindrical surface to cradle 2 , slides in a rotating movement in direction of arrow. With servo piston 12 , the area receiving the pressure is different on the left and the right, so main pump discharge pres- sure self pressure PP is always brought to the chamber receiving the pressure at the small diameter piston end.

Output pressure Pen of the LS valve is brought to the chamber receiving the pressure at the large diameter end. The relationship in the size of pressure PP at the small diameter piston end and pres- sure Pen at the large diameter end, and the ratio between the area receiving the pressure of the small diameter piston and the large diameter piston controls the movement of servo piston Plug PP : Pump port 2.

In this way, it carries out equal horsepower control so that the horsepower absorbed by the pump does not exceed the engine horsepower.

When pressure of spring 4 weaker, and the differ- this happens, the PC valve is connected to the ence between PLS and PP changes when drain port, so circuit D – K becomes drain ports D and E of spool 6 are connected. The operation of the PC valve is explained later. When LS because of the difference in area between the differential pressure PLS becomes larger large diameter end and the small diameter for example, when the area of opening of the end of servo piston 12 , servo piston 12 is control valve becomes smaller and pump pushed to the left.

This command current acts on the PC- this position. EPC valve and outputs the signal pres- The size of command current X is deter- sure. When this signal pressure is mined by the nature of the operation received, the force pushing piston 2 is lever operation , the selection of the changed. Piston 2 For the F pump, it is the R pump pressure stops at a position where the combined For the R pump, it is the F pump pressure force pushing spool 3 is balanced, and.

If port E and port G of the LS valve are connected see 1 LS valve , the pressure entering the large diameter end of the piston from port J becomes drain pressure PT, and servo piston 9 moves to the right.

In this way, the pump discharge amount moves in the direction of increase. As servo piston 9 moves further, springs 4 and 6 expand and the spring force becomes weaker. When the spring force becomes weaker, spool 3 moves to the left, so the connection between port C and port D is cut, and the pump discharge pressure ports B and C are connected. As a result, the pressure at port C rises, and the pressure at the large diameter end of the piston also rises, so the movement of piston 9 to the right is stopped.

When load on actuator is large and pump discharge pressure is high When the load is large and pump dis- If main pump pressure PP increases fur- charge pressures PP1 and PP2 are high, ther and spool 3 moves further to the the force pushing spool 3 to the left left, main pump pressure PP1 flows to becomes larger and spool 3 moves to port C and acts to make the discharge the position in the diagram above.

When this happens, is too large, so use the resistor to control the pressure at the small diameter end of the current flowing to PC-EPC valve sole- the piston is large, so servo piston 9 noid 1.

In this case, the pressure from port A flows to port C, so servo piston 9 moves to the left to make the discharge amount smaller by the same mechanism as explained in item 2 -b, and stops at a position to the left of the position when the load on the pump is light. In other words, even when the emergency pump drive switch is ON, the curve for the pump pressure PP. Body 5. Spool 6. Plunger PT : To tank 3. Spring 7. The EPC valve consists of the proportional solenoid portion and the hydraulic valve portion.

When it receives signal current i from the pump controller, it generates the EPC out- put pressure in proportion to the size of the signal, and outputs it to the LS valve. When signal current is 0 coil deener- gized When there is no signal current flowing from the controller to coil 5 , coil 5 is generalized.

For this reason, spool 2 is pushed to the right in the direction of the arrow by spring 3. When signal current is very small coil energized When a very small signal current flows to coil 5 , coil 5 is energized, and a propul- sion force is generated which pushes plunger 6 to the left. Therefore, the circuit pressure between the EPC valve and the LS valve is controlled in proportion to the size of the signal current.

When signal current is maximum coil energized When the signal current flows to coil 5 , coil 5 is energized. When this happens, the signal current is at its maximum, so the propulsion force of plunger 6 is also at its maximum.

For this reason, spool 2 is pushed fully to the left by push pin 4. At the same time, port PT closes and stops the oil from flowing to the tank. Cover 1 3. Cover 2 This control valve consists of a 6-spool 4. Pump merge-divider valve valve unit type , 1 service valves, a pump 5. Back pressure valve merge-divider valve, a back pressure valve, 6. Boom lock valve and a boom hydraulic drift prevention 7. Service valve valve.

Since all the valves are assembled together with connecting bolts and their passes are connected to each other inside the assem- bly, the assembly is small in size and easy to maintain. Since one spool of this control valve is used for one work equipment unit, its struc- ture is simple. Unload valve 9. Pressure compensation valve Service 2. Pressure compensation valve Arm OUT Pressure compensation valve Right travel Pressure compensation valve Left travel for- Reverse ward 4.

Pressure compensation valve Left swing Pressure compensation valve Right swing 6. Pressure compensation valve Left travel Pressure compensation valve Right travel reverse forward 7. Pressure compensation valve Arm IN 8. Pressure compensation valve Service Main relief valve. Spool Arm 6.

Spool Bucket 2. Spool Right travel 7. Spool Service 3. Spool Swing 8. Unload valve 4. Spool Boom 9. Main relief valve 5. Spool Left travel Spool return spring. Safety-suction valve Arm OUT Safety-suction valve Arm IN 2.

Suction valve Right travel reverse LS shuttle valve Arm 3. LS shuttle valve Right travel 4. Suction valve Left travel reverse LS select valve 5. LS shuttle valve Boom 6.

Safety-suction valve Service LS shuttle valve Left travel 7. Safety-suction valve 2-stage Service LS shuttle valve Bucket 8. LS shuttle valve Service 9. Suction valve Left travel forward LS check valve Pressure relief plug Suction valve Right travel forward. Standard size Repair limit Free length x Installed Installed Free Installed If damaged or 22 Check valve spring Outside diameter length load length load deformed, replace spring 1.

Unload valve 5. Safety-suction valve 2. Main relief valve 6. Spool Suction valve 3. Safety valve Boom 7. Pressure compensation valve Pressure compensation valve 4. Lift check valve 8. LS shuttle valve Reverse LS shuttle valve 9. Pressure compensation valve IN Forward Safety-suction valve Suction valve Check valve for regeneration cir- cuit. Safety-suction valve 7. Spool 8. Spool 3.

Pressure compensation valve DUMP 9. LS shuttle valve LS shuttle valve 5. Pressure compensation valve CURL Pressure compensation valve 6. Safety-suction valve. Spool 5. Suction valve 2. Pressure compensation 6.

Pump merge-divider valve valve Left 7. Pressure compensation Travel junction valve 3. Return spring 4. Pressure compensation 8. Hydraulic drift prevention Suction valve valve Right valve Spool 9. Pressure compensation Pressure compensation valve Reverse valve Lower Check valve for regeneration valve Forward circuit Suction valve.

Valve Pressure reducing valve 7. Valve Sequence valve Spring Safety valve 8. Spring Sequence valve Distributor and confluence valve Left 7.

Pressure compensation valve Travel junction valve 3. The relief valve set pressure is set to 2 stages. When power is needed, pilot pressure P is turned ON and the pressure is set to high pressure.

The relief valve set pressure is determined by the installed load of spring 1. First stage It is unnecessary to set the first and second stage individually. The second stage is set when the first stage is set. When pilot pressure P is ON: High-pressure setting In addition to the installed load of spring 1 , pilot pressure P is applied to poppet diameter d1, so the set pressure becomes higher.

The maximum LS pressure passes through throttle d and enters chamber e. At the same time, the cylinder port pressure passes through passage c and throttle f, and goes to chamber h. In addition, the force of spring 2 acts on valve 1 , and the force of spring 5 acts on poppet 4. The force of spring 5 can be adjusted with screw 6. The pump pressure and LS pressure are determined by the pressure of the other work equipment, but the cylinder port pressure becomes the actuating pressure of the attach- ment.

If the difference between pump pressure P and the cylinder pressure becomes greater than the force of spring 5 , poppet 4 is pushed to the right and the passage opens, so the pump passage is connected to the cyl- inder port through throttle a, chamber g, and passages b and c, and the oil flows to the cyl- inder port.

If the hydraulic oil flows in port P2, the dx P2 pressure becomes equal to the total of the force of spring 8 and the value of area of d x PR pressure, then the area of the pass between ports P2 and A2 is so adjusted that the P2 pressure will be kept constant above the PR pressure. If the PR pressure rises above the set level, poppet 11 opens and the hydraulic oil flows from the PR port through orifice “a” in spool 14 and open part of poppet 11 to seal drain port TS.

When load pressure P2 is high If load pressure A2 rises and the pump dis- charge increases because of operation of the work equipment, the dx P2 pressure rises higher than the total of the force of spring 8 and the value of d x PR pressure, and then valve 7 moves to the right stroke end.

As a result, the area of the pass between ports P2 and A2 increases and the pass resis- tance lowers and the loss of the engine power is reduced. If the PR pressure rises above the set pres- sure, poppet 11 opens and the hydraulic oil flows from the PR port through orifice “a” in spool 14 and open part of poppet 11 to seal drain port TS. When abnormally high pressure is generated If the PR pressure on the self-pressure reducing valve rises high abnormally, ball 16 separates from the seat against the force of spring 15 and the hydraulic oil flows from output port PR to TS.

Accord- ingly, the PR pressure lowers. By this oper- ation, the hydraulic devices PPC valves, solenoid valves, etc. Safety valve set pressure Brake release pressure 1.

Brake spring 8. Housing Safety valve 2. Drive shaft 9. Check valve 3. Spacer Cylinder block Check valve spring 4. Case Valve plate Shuttle valve 5. Disc Reverse prevention valve Shuttle valve spring 6. Plate Center shaft 7. Brake piston Center spring. Operation of swing lock 1. When swing lock solenoid valve is deacti- vated When the swing lock solenoid valve is deacti- vated, the pressurized oil from the main pump is shut off and port B is connected to the tank cir- cuit.

The pressure oil entering chamber a overcomes brake spring 1 and pushes brake piston 7 up. As a result, discs 5 and plates 6 are separated and the brake is released. Function When the swing is stopped, the outlet port circuit of the motor from the control valve is closed, but the motor continues to rotate under inertia, so the pressure at the output side of the motor becomes abnormally high, and this may damage the motor. To prevent this, the abnormally high pres- sure oil is relieved to port S from the outlet port of the motor high-pressure side to prevent any damage.

Operation 1 When starting swing When the swing control lever is operated to swing right, the pressure oil from the pump passes through the control valve and is supplied to port MA.

With the oil from the outlet port of the motor, the return circuit to the tank is closed by the control valve , so the pressure at port MB rises. As a result, rotation resistance is generated in the motor, so the braking effect starts. If the pressure at port MB becomes higher than the pressure at port MA, it pushes shuttle valve A 4 and chamber C becomes the same pressure as port MB. The oil pressure rises further until it reaches the set pressure of relief valve 1.

As a result, a high braking torque acts on the motor and stops the motor. This prevents cavitation at port MA. Valve body 2. Spool MA side 3. Spring MA side 4. Plug 5. Spool MB side 6. Spring MB side 7. Outline This valve reduces the swing back genera- tion in the swing body by the inertia of the swing body, the backlash and rigidity of the machinery system, and the compression of the hydraulic oil when the swing is stopped.

This is effective in preventing spillage of the load and reducing the cycle time when stopping the swing the posi- tioning ability is good and it is possible to move swiftly to the next job. When this happens, pressure MA is below the set pressure of spring 3 , so spool 2 does not move.

For this reason, the pres- sure oil is closed by spool 2 , and the brak- ing force is ensured. Pressure MA goes to chamber a, so spool 2 pushes spring 3 and moves to the right, and MA is con- nected to B. At the same time, b is con- nected to f through the drill hole in spool 5 , so the reversal pressure at port MA is bypassed to port T to prevent the 2nd reversal. Cover A1. To tank 2. Body A2. From control valve port A5 T1.

From L. Slipper seal C1. From control valve port B2 4. O-ring B2. From control valve port B5 B1. Shaft D1. From control valve port A2 E. Check Item Criteria Remedy. Regulator piston 9. Check valve spring Valve plate 2. Spring Output shaft Counterbalance valve 3.

Regulator valve Ring 4. Retainer guide Spool return spring 5. Motor case Pin Brake piston 6. Suction safety valve spring Plate 7. Suction safety valve Retainer Disc 8. Check valve Cylinder The solenoid valve is deactivated, so the pilot At the same time, the pressurized oil at regu- pressure oil from the main pump does not lator piston 15 passes through orifice c in flow to port P. Fulcrum a of rocker cam 4 is eccentric to point of force b of the combined force of the propulsion force of cylinder 6 , so the com- bined force of the piston propulsion force acts as a moment to angle rocker cam 4 in the direction of the maximum swash plate angle.

When the solenoid valve is excited, the pilot pressure oil from the main pump flows to port P, and pushes regulator valve 9 to the left direction of the arrow. Because of this, the main pressure oil from the control valve passes through passage d in regulator valve 9 , enters regulator piston 15 at the bottom, and pushes regulator pis- ton 15 to the right in the direction of the arrow.

As a result, rocker cam 4 moves in the mini- mum swash plate angle direction, the motor capacity becomes minimum. It overcomes the force of spring 11 , and SJP pushes piston 12 to the left in the direc- tion of the arrow. OR When this happens, the force pushing plate 13 and disc 14 together is lost, so plate 13 and disc 14 separate and the brake is released.

When stopping travel When the travel lever is placed in neutral, counterbalance valve spool 19 returns to the neutral position and the circuit to the parking brake is closed. The pressurized oil in chamber A of brake piston 12 is drained to the case from the orifice in the brake piston, and brake piston SJP 12 is pushed to the right in the direction of the arrow by spring OR As a result, plate 13 and disc 14 are pushed together, and the brake is applied.

When the pressure in cham- ber S1 goes above the spool switching pressure, spool 19 is pushed to the right in the direction of the arrow. As a result, port MB and port PB are con- nected, the outlet port side of the motor is opened, and the motor starts to rotate.

When this happens, the passage to the suction- safety valve becomes the circuit flowing through the small notch B2 in the counter- balance valve spool. As a result, a big dif- ference in pressure is created, and the pump pressure rises to provide a powerful drawbar pull. Function Operation This valve connects both travel circuits to each When pilot pressure is turned ON other so that the hydraulic oil will be supplied If the pilot pressure from the travel junction sole- evenly to both travel motors and the machine will noid valve becomes higher than the force of travel straight.

When pilot pressure is turned OFF If pilot pressure PST from the sole- If the oil flow rates in both travel motors noid valve is 0, travel junction spool become different from each other, the oil 13 is pressed by the force of spring flows through the route between port PTL, 14 against the right side and the travel junction spool 13 , and port PTR so pass between ports PTL and PTR is that the oil flow rates will be equalized again.

Travel PPC valve 8. Service PPC valve 9. Service pedal Spool 7. Joint 2. Metering spring 8. Plate 3. Centering spring 9. Retainer 4. Filter 6. Nut For connection of lever Unit: mm. When this happens, fine control hole f is shut off from drain chamber D, and at almost the same time, it is connected to pump pressure chamber PP, so pilot pres- sure oil from the main pump passes through fine control hole f and goes from port P1 to port A.

When this happens, spool 1 moves up or down so that the force of metering spring 2 is bal- anced with the pressure at port P1. The relationship in the position of spool 1 and body 10 fine control hole f is at a point midway between drain hole D and pump pressure chamber PP does not change until retainer 9 contacts spool 1. Therefore, metering spring 2 is com- pressed proportionally to the amount of movement of the control lever, so the pres- sure at port P1 also rises in proportion to the travel of the control lever.

In this way, the control valve spool moves to a position where the pressure in chamber A the same as the pressure at port P1 and the force of the control valve spool return spring are balanced.

The oil passes through port P2 and enters chamber B to fill the chamber with oil. Therefore, the pilot pressure oil from the main pump passes through fine control hole f and flows to chamber A from port P1, and pushes the control valve spool. The oil returning from chamber B passes from port P2 through fine control hole f and flows to drain chamber D. Plate 6. Centering spring 2. Body 7. Valve 3. Damper 4. Collar 9. Steering signal 5.

Metering spring Steering signal valve spring. Spool 1 is also pushed by metering spring 2 , and moves down. When this happens, fine control hole f is shut off from drain chamber D. At almost the same time, it is connected to pump pressure chamber PP, and the pilot pres- sure of the main pump is sent from port A through fine control hole f to port P1. When the pressure at port P1 rises, spool 1 is pushed back. Fine control hole f is shut off from pump pressure chamber PP.

At almost the same time, it is connected to drain chamber D, so the pressure at port P1 escapes. As a result, spool 1 moves up and down until the force of metering spool 2 is bal- anced with the pressure at port P1.

If the pressure at port P1 drops too much, spool 1 is pushed up by metering spring 2 , so fine control hole f is shut off from drain chamber D. At almost the same time, it is connected to pump pressure chamber PP, so the pressure at port P1 supplies the pump pressure until the pressure recovers to a pres- sure equivalent to the position of the lever. When the control valve returns, oil in drain chamber D flows in from fine control hole f’ of the valve on the side that is not moving.

It passes through port P2 and goes to cham- ber B to charge the oil. Fine control hole f is shut off from drain chamber D, and is connected to pump pressure chamber PP.

Therefore, the pilot pressure oil from the main pump passes through fine control hole f and flows to chamber A from port P1 to push the control valve spool. The return oil from chamber B passes from port P2 through fine control hole f’ and flows to drain chamber D.

Accordingly, if the machine is traveling is judged by the signal of port P5. Steering signal If the operation quantities of both levers are different from each other as in the steering operation, the higher one of the PPC output pressures on both sides is output as the steering signal.

Accordingly, the steering signal valve is kept in neutral and the steering signal Port P6 is not output. If the operation quantities of both levers are different from each other as in the steering operation If the difference of the pilot pressure between both sides is higher than a certain level , the pilot pressure is output as the steering signal. In the case of the following drawing, the pressure in left spring chamber k of steering signal valve j is P2.

The pressure in right spring chamber l is P4. While the left motor is operating for reverse travel the signal of port P1 is output and the right motor is operating for forward travel the signal of port P4 is output , only the pressure in right spring chamber l of steering signal valve j is set high. Accordingly, the steering signal valve moves to the left and outputs the steering signal port P6.

Spool 2. Metering spring 3. Centering spring 4. Piston 5. Lever 6. Retainer 8. Ports A and B of the control valve and ports a and b of the PPC valve are con- nected to drain port T through fine control hole X of spool 1. When lever 5 is moved, metering spring 2 is pushed by piston 4 and retainer 7 , and spool 1 is pushed down by this.

As a result, fine control portion Y is con- nected with port a, and the pressurized oil from port P flows from port a to port A of the control valve. When the pressure at port a becomes higher, spool 1 is pushed back by the force acting on the end of the spool, and fine control portion Y closes.

Merge-divider solenoid valve tion valve ACC: To accumulator 4. Travel speed solenoid valve A3. To main valve Merge- 5. Swing brake solenoid valve divider valve 6. Connector 2. Moving core 3. Coil 4.

Pc200lc-7 shop manual download free.Komatsu PC200-7 PC200LC-7 Excavator Service Manual Download

Electronic guides mainly contain necessary technical information for operations performed in-service workshop, safety rules, troubleshooting, repair recommendation, and how to solve any problems with your technic. Before using this machine it is very important to carefully read the “safety rules” section.

This will help you to avoid various technical failures of your device and to avoid serious injuries. Factory files are designed to work on a personal computer or laptop. An online text comes in PDF format in the English language. If you have any questions, write to us and we will answer all your questions.

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Spool Left travel Spool return spring. Safety-suction valve Arm OUT Safety-suction valve Arm IN 2. Suction valve Right travel reverse LS shuttle valve Arm 3. LS shuttle valve Right travel 4. Suction valve Left travel reverse LS select valve 5. LS shuttle valve Boom 6. Safety-suction valve Service LS shuttle valve Left travel 7. Safety-suction valve 2-stage Service LS shuttle valve Bucket 8.

LS shuttle valve Service 9. Suction valve Left travel forward LS check valve Pressure relief plug Suction valve Right travel forward. Standard size Repair limit Free length x Installed Installed Free Installed If damaged or 22 Check valve spring Outside diameter length load length load deformed, replace spring 1.

Safety-suction valve. Spool 5. Suction valve 2. Pressure compensation 6. Pump merge-divider valve valve Left 7.

Pressure compensation Travel junction valve 3. Return spring 4. Pressure compensation 8. Hydraulic drift prevention Suction valve valve Right valve Spool 9. Pressure compensation Pressure compensation valve Reverse valve Lower Check valve for regeneration valve Forward circuit Suction valve.

LS bypass plug 2. Main relief valve Screw 3. Pump merge-divider valve Main Poppet 4. Return spring Spring Pressure reducing valve pilot 5. Pump merge-divider valve For LS Spring Pressure reducing valve main 6. Valve Pressure reducing valve 7. Valve Sequence valve Spring Safety valve 8. Spring Sequence valve Distributor and confluence valve Left 7.

Pressure compensation valve Travel junction valve 3. The relief valve set pressure is set to 2 stages. When power is needed, pilot pressure P is turned ON and the pressure is set to high pressure. The relief valve set pressure is determined by the installed load of spring 1. First stage It is unnecessary to set the first and second stage individually. The second stage is set when the first stage is set. When pilot pressure P is ON: High-pressure setting In addition to the installed load of spring 1 , pilot pressure P is applied to poppet diameter d1, so the set pressure becomes higher.

From service valve spool spool acts on the left end of valve 1 , and at CP. Cylinder port the same time passes through throttle a and LS. Load pressure from other work equipment enters chamber g. The maximum LS pressure passes through throttle d and enters chamber e. At the same time, the cylinder port pressure passes through passage c and throttle f, and goes to chamber h.

In addition, the force of spring 2 acts on valve 1 , and the force of spring 5 acts on poppet 4. The force of spring 5 can be adjusted with screw 6.

The pump pressure and LS pressure are determined by the pressure of the other work equipment, but the cylinder port pressure becomes the actuating pressure of the attach- ment. If the difference between pump pressure P and the cylinder pressure becomes greater than the force of spring 5 , poppet 4 is pushed to the right and the passage opens, so the pump passage is connected to the cyl- inder port through throttle a, chamber g, and passages b and c, and the oil flows to the cyl- inder port.

When this happens, a differential pressure is formed between the upstream and downstream sides of throttle a, and the pressure in chamber g goes down, so the force pushing valve 1 to the left is reduced. In other words, the area ratio becomes smaller, so valve 1 moves to the right and increases the flow from the pump to the cylin- der. Basic principle 1 Control of pump swash plate The pump swash plate angle pump dis- charge amount is controlled so that LS dif- ferential pressure PLS the difference between pump pressure PP and control valve outlet port LS pressure PLS load pressure of actuator is constant.

If LS differential pressure PLS becomes lower than the set pressure of the LS valve when the actuator load pressure is high , the pump swash plate moves towards the maximum position; if it becomes higher than the set pressure of the LS valve when the actuator load pressure is low , the pump swash plate moves towards the min- imum position.

When two actuators are operated together, this valve acts to make pressure difference P between the upstream inlet port and down- stream outlet port of the spool of each valve the same regardless of the size of the load pressure. This valve reduces the discharge pressure of the main pump and supplies it as control pressure for the solenoid valves, PPC valves, etc.. When engine is stopped Poppet 11 is pressed by spring 12 against the seat and port PR is not connected to TS. Valve 14 is pressed by spring 13 against the left side and port P2 is connected to PR.

Valve 7 is pressed by spring 8 against the left side and port P2 is not connected to A2. When in neutral or load pressure P2 is low When boom is lowered and arm is in IN position and they are moving down under own weight Note: When load pressure A2 is lower than self-pres- sure reducing valve output pressure PR. If the hydraulic oil flows in port P2, the dx P2 pressure becomes equal to the total of the force of spring 8 and the value of area of d x PR pressure, then the area of the pass between ports P2 and A2 is so adjusted that the P2 pressure will be kept constant above the PR pressure.

Accord- ingly, the PR pressure lowers. By this oper- ation, the hydraulic devices PPC valves, solenoid valves, etc. Safety valve set pressure Brake release pressure 1. Brake spring 8. Housing Safety valve 2. Drive shaft 9. Check valve 3. Spacer Cylinder block Check valve spring 4.

Case Valve plate Shuttle valve 5. Disc Reverse prevention valve Shuttle valve spring 6. Plate Center shaft 7. Brake piston Center spring. Operation of swing lock 1. When swing lock solenoid valve is deacti- vated When the swing lock solenoid valve is deacti- vated, the pressurized oil from the main pump is shut off and port B is connected to the tank cir- cuit.

To prevent this, the abnormally high pres- sure oil is relieved to port S from the outlet port of the motor high-pressure side to prevent any damage. Operation 1 When starting swing When the swing control lever is operated to swing right, the pressure oil from the pump passes through the control valve and is supplied to port MA.

As a result, the pressure at port MA rises, the starting torque is generated in the motor, and the motor starts to rotate. The oil from the out- let port of the motor passes from port MA through the control valve and returns to the tank. With the oil from the outlet port of the motor, the return circuit to the tank is closed by the control valve , so the pressure at port MB rises. As a result, rotation resistance is generated in the motor, so the braking effect starts.

If the pressure at port MB becomes higher than the pressure at port MA, it pushes shuttle valve A 4 and chamber C becomes the same pressure as port MB. The oil pressure rises further until it reaches the set pressure of relief valve 1. As a result, a high braking torque acts on the motor and stops the motor.

This prevents cavitation at port MA. Valve body 2. Spool MA side 3. Spring MA side 4. Plug 5. Spool MB side 6. Spring MB side 7.

Outline This valve reduces the swing back genera- tion in the swing body by the inertia of the swing body, the backlash and rigidity of the machinery system, and the compression of the hydraulic oil when the swing is stopped. This is effective in preventing spillage of the load and reducing the cycle time when stopping the swing the posi- tioning ability is good and it is possible to move swiftly to the next job. When this happens, pressure MA is below the set pressure of spring 3 , so spool 2 does not move.

Cover A1. To tank 2. Body A2. From control valve port A5 T1. From L. Slipper seal C1. From control valve port B2 4. O-ring B2. From control valve port B5 B1. Shaft D1. From control valve port A2 E. Check Item Criteria Remedy. Regulator piston 9. Check valve spring Valve plate 2. Spring Output shaft Counterbalance valve 3. Regulator valve Ring 4. Retainer guide Spool return spring 5. Motor case Pin Brake piston 6.

Suction safety valve spring Plate 7. Suction safety valve Retainer Disc 8. Check valve Cylinder The solenoid valve is deactivated, so the pilot At the same time, the pressurized oil at regu- pressure oil from the main pump does not lator piston 15 passes through orifice c in flow to port P. Fulcrum a of rocker cam 4 is eccentric to point of force b of the combined force of the propulsion force of cylinder 6 , so the com- bined force of the piston propulsion force acts as a moment to angle rocker cam 4 in the direction of the maximum swash plate angle.

It overcomes the force of spring 11 , and SJP pushes piston 12 to the left in the direc- tion of the arrow. OR When this happens, the force pushing plate 13 and disc 14 together is lost, so plate 13 and disc 14 separate and the brake is released. When stopping travel When the travel lever is placed in neutral, counterbalance valve spool 19 returns to the neutral position and the circuit to the parking brake is closed.

The pressurized oil in chamber A of brake piston 12 is drained to the case from the orifice in the brake piston, and brake piston SJP 12 is pushed to the right in the direction of the arrow by spring OR As a result, plate 13 and disc 14 are pushed together, and the brake is applied. To prevent this these valves act to make the machine travel according to the engine speed pump discharge amount. Operation when pressure oil is supplied When the travel lever is operated, the pres- surized oil from the control valve is sup- plied to port PA.

However, the motor outlet port is closed by suction safety valve 18B and spool 19 , so the pressure at the supply side rises. The pressurized oil at the supply side flows from orifice E1 and E2 in spool 19 to chamber S1. When the pressure in cham- ber S1 goes above the spool switching pressure, spool 19 is pushed to the right in the direction of the arrow.

As a result, port MB and port PB are con- nected, the outlet port side of the motor is opened, and the motor starts to rotate. Operation of brake when traveling downhill If the machine tries to run away when travel- ing downhill, the motor will turn under no load, so the pressure at the motor inlet port will drop, and the pressure in chamber S1 through orifices E1 and E2 will also drop.

When the pressure in chamber S1 drops below the spool switching pressure, spool 19 is returned to the left, in the direction of the arrow by spring 20 , and outlet port MB is throttled.

As a result, the pressure at the outlet port side rises, resistance is generated to the rota- tion of the motor, and this prevents the machine from running away. In other words, the spool moves to a position where the pressure at the outlet port MB bal- ances the pressure at the inlet port and the force generated by the weight of the machine. It throttles the outlet port circuit and controls the travel speed according to the amount of oil discharged from the pump.

The safety valve acts to release this abnormal pressure and send it to the inlet port side of the motor to prevent damage to the equipment.

Operation 1. When travel is stopped or when travel- ing downhill, rotating to right When the motor inlet port pressure pressure PA goes down, the pressure in chamber S1 also goes down. When it goes below the switching pressure of the spool, spool is returned to the left by spring 20 , and outlet port passage B1 is throttled. When this hap- pens, the motor continues to rotate under inertia, so the outlet pressure pressure MB rises.

The oil then passes through large notch A1 in counterbalance valve spool 19 and flows to chamber MA in the circuit on the opposite side. When rotating to left The operation is the reverse of when rotating to the right. When this happens, the passage to the suction- safety valve becomes the circuit flowing through the small notch B2 in the counter- balance valve spool. As a result, a big dif- ference in pressure is created, and the pump pressure rises to provide a powerful drawbar pull.

When this happens, spool 1 moves up or down so that the force of metering spring 2 is bal- anced with the pressure at port P1.

The relationship in the position of spool 1 and body 10 fine control hole f is at a point midway between drain hole D and pump pressure chamber PP does not change until retainer 9 contacts spool 1.

Therefore, metering spring 2 is com- pressed proportionally to the amount of movement of the control lever, so the pres- sure at port P1 also rises in proportion to the travel of the control lever. In this way, the control valve spool moves to a position where the pressure in chamber A the same as the pressure at port P1 and the force of the control valve spool return spring are balanced.

When the spool of the control valve returns, oil in drain chamber D flows in from fine control hole f in the valve on the side that is not working. Functions and Features. Komatsu PC shop manual. Model, Notes. Download Komatsu pc 7 service manual. Open navigation menu. Close suggestions Search Search. User Settings. Skip carousel. Carousel Previous. Carousel Next. What is Scribd? Explore Ebooks. Bestsellers Editors’ Picks All Ebooks. Explore Audiobooks. Bestsellers Editors’ Picks All audiobooks.

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The design features of the forklifts and a wide range of operating temperatures allow the use of equipment indoors and outdoors equally;. Forklift trucks are characterized by high functionality, productivity, and load capacity up to 1. The special equipment is equipped with an informative control system that guarantees a smooth start even when turning on the spot, confident driving, maneuverability, and quick response to the slightest change in direction;.

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PC and up. Jan 21, Manual de operacion y mantenimiento de komatsu PC Operators and maintenance personnel must read this manual before operating.

Komatsu Pc Workshop Manual. Hydraulic Excavator Service. PC Batch Controller Description. Functions and Features. Komatsu PC shop manual. Model, Notes. Download Doownload pc 7 service manual. Open navigation menu. Close suggestions Search Search. User Settings. Skip carousel. Carousel Previous. Carousel Next. What is Scribd? Explore Источник. Bestsellers Editors’ Picks All Ebooks.

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У шифров-убийц обычно есть функция злопамятства – чтобы не допустить использования метода проб и ошибок. Некорректный ввод только ускорит процесс разрушения. Два некорректных ввода – и шифр навсегда захлопнется от нас на замок. Тогда всему придет конец. Директор нахмурился и повернулся к экрану.

Body A2. From control valve port A5 T1. From L. Slipper seal C1. From control valve port B2 4. O-ring B2. From control valve port B5 B1. Shaft D1. From control valve port A2 E. Check Item Criteria Remedy. Regulator piston 9. Check valve spring Valve plate 2.

Spring Output shaft Counterbalance valve 3. Regulator valve Ring 4. Retainer guide Spool return spring 5. Motor case Pin Brake piston 6. Suction safety valve spring Plate 7. Suction safety valve Retainer Disc 8. Check valve Cylinder The solenoid valve is deactivated, so the pilot At the same time, the pressurized oil at regu- pressure oil from the main pump does not lator piston 15 passes through orifice c in flow to port P. Fulcrum a of rocker cam 4 is eccentric to point of force b of the combined force of the propulsion force of cylinder 6 , so the com- bined force of the piston propulsion force acts as a moment to angle rocker cam 4 in the direction of the maximum swash plate angle.

When the solenoid valve is excited, the pilot pressure oil from the main pump flows to port P, and pushes regulator valve 9 to the left direction of the arrow.

Operation when pressure oil is supplied When the travel lever is operated, the pres- surized oil from the control valve is sup- plied to port PA. However, the motor outlet port is closed by suction safety valve 18B and spool 19 , so the pressure at the supply side rises.

When the pressure in chamber S1 drops below the spool switching pressure, spool 19 is returned to the left, in the direction of the arrow by spring 20 , and outlet port MB is throttled.

When travel is stopped or when travel- ing downhill, rotating to right When the motor inlet port pressure pressure PA goes down, the pressure in chamber S1 also goes down. When it goes below the switching pressure of the spool, spool is returned to the left by spring 20 , and outlet port passage B1 is throttled. When this hap- pens, the motor continues to rotate under inertia, so the outlet pressure pressure MB rises. The oil then passes through large notch A1 in counterbalance valve spool 19 and flows to chamber MA in the circuit on the opposite side.

When the pressure at port P1 becomes higher, spool 1 is pushed back and fine control hole f is shut off from pump pres- sure chamber PP. At almost the same time, it is connected to drain chamber D to release the pressure at port P1. When this happens, spool 1 moves up or down so that the force of metering spring 2 is bal- anced with the pressure at port P1. The relationship in the position of spool 1 and body 10 fine control hole f is at a point midway between drain hole D and pump pressure chamber PP does not change until retainer 9 contacts spool 1.

Therefore, metering spring 2 is com- pressed proportionally to the amount of movement of the control lever, so the pres- sure at port P1 also rises in proportion to the travel of the control lever.

In this way, the control valve spool moves to a position where the pressure in chamber A the same as the pressure at port P1 and the force of the control valve spool return spring are balanced.

Therefore, the pilot pressure oil from the main pump passes through fine control hole f and flows to chamber A from port P1, and pushes the control valve spool. The oil returning from chamber B passes from port P2 through fine control hole f and flows to drain chamber D.

Plate 6. Centering spring 2. Body 7. Valve 3. Damper 4. Collar 9. Steering signal 5. Metering spring Steering signal valve spring. Spool 1 is also pushed by metering spring 2 , and moves down. When this happens, fine control hole f is shut off from drain chamber D. At almost the same time, it is connected to pump pressure chamber PP, and the pilot pres- sure of the main pump is sent from port A through fine control hole f to port P1.

When the pressure at port P1 rises, spool 1 is pushed back. Fine control hole f is shut off from pump pressure chamber PP. At almost the same time, it is connected to drain chamber D, so the pressure at port P1 escapes. As a result, spool 1 moves up and down until the force of metering spool 2 is bal- anced with the pressure at port P1.

The relationship of the position of spool 1 and body 10 fine control hole f is in the middle between drain hole D and pump pressure chamber PP does not change until retainer 9 contacts spool 1. Therefore, metering spring 2 is com- pressed in proportion to the travel of the control lever, so the pressure at port P1 also rises in proportion to the travel of the control lever. In this way, the spool of the control valve spool moves to a position where the pressure of chamber A same as pressure at port P1 and the force of the return spring of the control valve spool are balanced.

Because of this, fine control hole f is con- nected to drain chamber D, and the pressur- ized oil at port P1 is released. If the pressure at port P1 drops too much, spool 1 is pushed up by metering spring 2 , so fine control hole f is shut off from drain chamber D. At almost the same time, it is connected to pump pressure chamber PP, so the pressure at port P1 supplies the pump pressure until the pressure recovers to a pres- sure equivalent to the position of the lever.

Therefore, the pilot pressure oil from the main pump passes through fine control hole f and flows to chamber A from port P1 to push the control valve spool.

Accordingly, the steering signal valve moves to the left and outputs the steering signal port P6. Spool 2. Metering spring 3. Centering spring 4. Piston 5. Lever 6. Retainer 8. Ports A and B of the control valve and ports a and b of the PPC valve are con- nected to drain port T through fine control hole X of spool 1. When lever 5 is moved, metering spring 2 is pushed by piston 4 and retainer 7 , and spool 1 is pushed down by this. As a result, fine control portion Y is con- nected with port a, and the pressurized oil from port P flows from port a to port A of the control valve.

When the pressure at port a becomes higher, spool 1 is pushed back by the force acting on the end of the spool, and fine control portion Y closes.

The spring force becomes larger, so the pressure at port a also increases in proportion to the amount the control lever is operated. In this way, the control valve spool moves to a position where the pressure of port A the same as the pressure at port a is bal- anced with the force of the return spring of the control valve spool.

Accordingly, spool 4 is pressed by spring 6 against the left side. By this operation, the pass from P to A is closed and the hydraulic oil from the main pump does not flow into the actuator. At this time, the oil from the actuator is drained through ports A and T into the tank.

The signal current flows from the controller to solenoid 3 , and the latter is turned on. Accordingly, spool 4 is pressed against to the right side. By this operation, the hydraulic oil from the main pump flows through port P and spool 4 to port A, then flows into the actuator.

At this time, port T is closed and the oil does not flow into the tank. Gas plug 2. Shell 3. Holder 2 5. Bladder 6. Oil port. Drain plug Rated pressure: 6. Case Relief valve cracking pressure: 4. Head cover 0. The main hydraulic oil is shut off from the Function holding pressure on the boom cylinder bot- This valve prevents the oil in the boom cylin- tom side.

The total of this pressure 1. When boom lever is in “RAISE” position If the boom lever is set in the “RAISE” posi- and the force of spring 4 closes poppet 5 to tion, the pressure of the main hydraulic oil is shut off the main hydraulic oil from the hold- applied toward the left to area “A” of the ring ing pressure on the boom cylinder bottom.

The oil on the boom bottom side flows from 2. When boom lever is in neutral orifice “a” through chamber “b” and orifice “c” If the control lever is returned to the neutral to the drain hole, and the oil pressure in position while the boom is raised, the oil in chamber “b” lowers. If the hydraulic drift prevention valve for the 4. When abnormally high pressure is gener- arm cylinder head circuit is installed ated optional , the hydraulic oil in the boom cylin- If abnormally high pressure is generated in der bottom circuit or that in the arm cylinder the boom cylinder bottom circuit, the hydrau- head circuit, having higher pressure, pushes lic oil in port B pushes check valve 6 open, check valve 6 or 6A open, then safety valve then safety valve 3 operates.

Standard Tolerance Standard clear- Clearance Clearance between connecting size ance limit Shaft Hole 1 pin and bushing of revolving frame and boom Clearance between connecting Arm as individual part 0 Hot water pickup piping A. Fresh air 2. Air conditioner compressor B. Recirculated air 3. Refrigerant piping C.

Condenser 5. Receiver tank 6. Hot water return piping 7. Air conditioner unit 8. Battery relay 2. Battery The engine can be started and stopped with 3. Starting switch only starting switch 3. Right now there is no transportation to the eBook shop.

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Explore Magazines. Editors’ Picks All magazines. Explore Podcasts All podcasts. Difficulty Beginner Intermediate Advanced. Explore Documents. Service Manual Pc 7. Uploaded by Hafid Rahman. Document Information click to expand document information Description: Pc Original Title Service Manual Pc 7 1. Did you find this document useful? Is this content inappropriate? Report this Document. As a rule, Komatsu FD20T is used to lift various loads. However, in addition to forks, various attachments can also be used on the forklift, which allows you to lift even non-standard loads.

Thanks to this, Komatsu FD20T diesel forklifts have wide applications in various fields. Most often, the forklift is used in commercial and industrial warehouses of enterprises, hypermarkets, and warehouse terminals. Diesel forklift trucks Komatsu FD20T are suitable for moving large and heavy loads and carrying out loading and unloading operations. The Komatsu FD35AT forklift has all the features required for long-term trouble-free operation and creates a comfortable and safe environment for operators operating the equipment.

This model is no longer in production , so we will briefly present the characteristics:. Hi, Im looking a shop manual of Komatsu PC Do you have it? Your email address will not be published. Use of materials placed on this site is allowed only if there is an active link to Truckmanualshub.

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А потом решил отплатить ей той же монетой. Он начал подписывать свои записки «Любовь без воска, Дэвид». Таких посланий она получила больше двух десятков. И все был подписаны одинаково: «Любовь без воска». Она просила его открыть скрытый смысл этих слов, но Дэвид отказывался и только улыбался: «Из нас двоих ты криптограф».

WebDec 28, · Get pclc 7 shop manual download free PDF file for free from our online library. PCLC 7 SHOP MANUAL DOWNLOAD FREE — | PDF | 61 Pages | KB . WebKomatsu PCLC-7L Excavator Service Manual. INCLUDES the following manuals: Komatsu PCLC-7L Excavator Shop Manual CEBM Komatsu PCLC-7L . WebNov 20, · You are free to download anything at all that we provide here, it will not cost you the slightest. DOWNLOAD HERE. Everyone knows that reading Pclc 7 Shop .

Pc200lc-7 shop manual download free.SM PC, PCLC-7 | PDF | Rope | Electrical Connector

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В желающих принять его на работу не было недостатка, а увидав, что он может творить на компьютере, они уже не хотели его отпускать. Профессионализм Хейла достиг высокого уровня, и у него появились знакомые среди интернет-пользователей по всему миру. Он был представителем новой породы киберпсихов и общался с такими же ненормальными в других странах, посещая непристойные сайты и просиживая в европейских чатах.

Никакой «Цифровой крепости» не существует! – сказал Стратмор. – Что. – Не существует алгоритма, не поддающегося взлому. – Нет, существует. Я видел его в Интернете.

Original Title: Service Manual Pc 7 1. Jump to Page. Search inside document. Related Interests Manufactured Goods. Manufactured Goods. Sk70sr-1es Shop Manual. Shop manual PC 8 ing. Grit: The Power of Passion and Perseverance. Yes Please. Doosan Basic Excavator Training. Komatsu Pump.

Sany Excavators SYC. Principles: Life and Work. Fear: Trump in the White House. Shop Manual Wa The World Is Flat 3. The Outsider: A Novel. The Handmaid’s Tale. The Alice Network: A Novel. Valve 14 is pressed by spring 13 against the left side and port P2 is connected to PR. Valve 7 is pressed by spring 8 against the left side and port P2 is not connected to A2.

When in neutral or load pressure P2 is low When boom is lowered and arm is in IN position and they are moving down under own weight Note: When load pressure A2 is lower than self-pres- sure reducing valve output pressure PR. If the hydraulic oil flows in port P2, the dx P2 pressure becomes equal to the total of the force of spring 8 and the value of area of d x PR pressure, then the area of the pass between ports P2 and A2 is so adjusted that the P2 pressure will be kept constant above the PR pressure.

If the PR pressure rises above the set level, poppet 11 opens and the hydraulic oil flows from the PR port through orifice “a” in spool 14 and open part of poppet 11 to seal drain port TS.

Accordingly, differential pressure is gener- ated between before and after orifice “a” in spool 14 and then spool 14 moves to close the pass between port P2 and PR. The P2 pressure is controlled constant at the set pressure by the area of the oil pass at this time and supplied as the PR pressure. When load pressure P2 is high If load pressure A2 rises and the pump dis- charge increases because of operation of the work equipment, the dx P2 pressure rises higher than the total of the force of spring 8 and the value of d x PR pressure, and then valve 7 moves to the right stroke end.

When abnormally high pressure is generated If the PR pressure on the self-pressure reducing valve rises high abnormally, ball 16 separates from the seat against the force of spring 15 and the hydraulic oil flows from output port PR to TS.

Disc Reverse prevention valve Shuttle valve spring 6. Plate Center shaft 7. Brake piston Center spring. Operation of swing lock 1.

When swing lock solenoid valve is deacti- vated When the swing lock solenoid valve is deacti- vated, the pressurized oil from the main pump is shut off and port B is connected to the tank cir- cuit. As a result, brake piston 7 is pushed down by brake spring 1 , discs 5 and plates 6 are pushed together, and the brake is applied. When swing lock solenoid valve is excited When the swing lock solenoid valve is excited, the valve is switched and the pressure oil from the main pump enters port B and flows to brake chamber a.

The oil from the out- let port of the motor passes from port MA through the control valve and returns to the tank. With the oil from the outlet port of the motor, the return circuit to the tank is closed by the control valve , so the pressure at port MB rises.

As a result, rotation resistance is generated in the motor, so the braking effect starts. If the pressure at port MB becomes higher than the pressure at port MA, it pushes shuttle valve A 4 and chamber C becomes the same pressure as port MB. The oil pressure rises further until it reaches the set pressure of relief valve 1. As a result, a high braking torque acts on the motor and stops the motor. This prevents cavitation at port MA. Valve body 2. Spool MA side 3.

Spring MA side 4. Plug 5. Spool MB side 6. Spring MB side 7. Outline This valve reduces the swing back genera- tion in the swing body by the inertia of the swing body, the backlash and rigidity of the machinery system, and the compression of the hydraulic oil when the swing is stopped. This is effective in preventing spillage of the load and reducing the cycle time when stopping the swing the posi- tioning ability is good and it is possible to move swiftly to the next job.

When this happens, pressure MA is below the set pressure of spring 3 , so spool 2 does not move. For this reason, the pres- sure oil is closed by spool 2 , and the brak- ing force is ensured.

Check valve Cylinder The solenoid valve is deactivated, so the pilot At the same time, the pressurized oil at regu- pressure oil from the main pump does not lator piston 15 passes through orifice c in flow to port P. Fulcrum a of rocker cam 4 is eccentric to point of force b of the combined force of the propulsion force of cylinder 6 , so the com- bined force of the piston propulsion force acts as a moment to angle rocker cam 4 in the direction of the maximum swash plate angle.

OR When this happens, the force pushing plate 13 and disc 14 together is lost, so plate 13 and disc 14 separate and the brake is released.

In other words, the spool moves to a position where the pressure at the outlet port MB bal- ances the pressure at the inlet port and the force generated by the weight of the machine. It throttles the outlet port circuit and controls the travel speed according to the amount of oil discharged from the pump.

The safety valve acts to release this abnormal pressure and send it to the inlet port side of the motor to prevent damage to the equipment. Operation 1. When travel is stopped or when travel- ing downhill, rotating to right When the motor inlet port pressure pressure PA goes down, the pressure in chamber S1 also goes down.

When it goes below the switching pressure of the spool, spool is returned to the left by spring 20 , and outlet port passage B1 is throttled. When this hap- pens, the motor continues to rotate under inertia, so the outlet pressure pressure MB rises. The oil then passes through large notch A1 in counterbalance valve spool 19 and flows to chamber MA in the circuit on the opposite side.

When rotating to left The operation is the reverse of when rotating to the right. When this happens, the passage to the suction- safety valve becomes the circuit flowing through the small notch B2 in the counter- balance valve spool. As a result, a big dif- ference in pressure is created, and the pump pressure rises to provide a powerful drawbar pull. Function Operation This valve connects both travel circuits to each When pilot pressure is turned ON other so that the hydraulic oil will be supplied If the pilot pressure from the travel junction sole- evenly to both travel motors and the machine will noid valve becomes higher than the force of travel straight.

If the pressure at port P1 drops too far, spool 1 is pushed down by metering spring 2 , and fine control hole f is shut off from drain chamber D.

At almost the same time, it is connected to pump pressure chamber PP, and the pump pressure is sup- plied until the pressure at port P1 recovers to a pressure that corresponds to the lever position. When the spool of the control valve returns, oil in drain chamber D flows in from fine control hole f in the valve on the side that is not working. The oil passes through port P2 and enters chamber B to fill the chamber with oil. Therefore, the pilot pressure oil from the main pump passes through fine control hole f and flows to chamber A from port P1, and pushes the control valve spool.

The oil returning from chamber B passes from port P2 through fine control hole f and flows to drain chamber D.

Fine control hole f is shut off from pump pressure chamber PP. At almost the same time, it is connected to drain chamber D, so the pressure at port P1 escapes.

As a result, spool 1 moves up and down until the force of metering spool 2 is bal- anced with the pressure at port P1. The relationship of the position of spool 1 and body 10 fine control hole f is in the middle between drain hole D and pump pressure chamber PP does not change until retainer 9 contacts spool 1. Therefore, metering spring 2 is com- pressed in proportion to the travel of the control lever, so the pressure at port P1 also rises in proportion to the travel of the control lever.

It passes through port P2 and goes to cham- ber B to charge the oil. Fine control hole f is shut off from drain chamber D, and is connected to pump pressure chamber PP.

Steering signal If the operation quantities of both levers are different from each other as in the steering operation, the higher one of the PPC output pressures on both sides is output as the steering signal. Any signal is not output from port P6 while the machine is travelling straight forward or reverse or in neutral. Accordingly, if the machine is being steered is judged by the signal of port P6. While the left motor is operating for forward travel the signal of port P2 is output and the right motor is also operating for forward travel the signal of port P4 is output , the pressures in left spring chamber k and right spring chamber l of steering signal valve j are set high.

In the case of the following drawing, the pressure in left spring chamber k of steering signal valve j is P2. The pressure in right spring chamber l is P4. While the left motor is operating for reverse travel the signal of port P1 is output and the right motor is operating for forward travel the signal of port P4 is output , only the pressure in right spring chamber l of steering signal valve j is set high.

Therefore, metering spring 2 is com- pressed in proportion to the amount the control lever is moved. The spring force becomes larger, so the pressure at port a also increases in proportion to the amount the control lever is operated. In this way, the control valve spool moves to a position where the pressure of port A the same as the pressure at port a is bal- anced with the force of the return spring of the control valve spool.

By this operation, the hydraulic oil from the main pump flows through port P and spool 4 to port A, then flows into the actuator. At this time, port T is closed and the oil does not flow into the tank. Gas plug 2. Shell 3. Holder 2 5. Bladder 6. Oil port.

Drain plug Rated pressure: 6. Case Relief valve cracking pressure: 4. Head cover 0. The main hydraulic oil is shut off from the Function holding pressure on the boom cylinder bot- This valve prevents the oil in the boom cylin- tom side.

If the hydraulic drift prevention valve for the 4. When abnormally high pressure is gener- arm cylinder head circuit is installed ated optional , the hydraulic oil in the boom cylin- If abnormally high pressure is generated in der bottom circuit or that in the arm cylinder the boom cylinder bottom circuit, the hydrau- head circuit, having higher pressure, pushes lic oil in port B pushes check valve 6 open, check valve 6 or 6A open, then safety valve then safety valve 3 operates. This valve applies back pressure to the drain circuit to prevent generation of negative pres- sure on the hydraulic devices for the work equipment motors, cylinders, etc.

While engine is stopped Any oil is not supplied from the pump to the self-pressure reducing valve and valve 1 is pressed by only the force of spring 2 toward the right and drain circuit “a” of the control valve is connected through orifice “b” of valve 1 to port T. While engine is running Output pressure PR of the self-pressure reducing valve is applied through the con- trol valve to spring chamber “c” of the back pressure valve. Output pressure PR applied to spring chamber “c” is applied to the left end of valve 1 area of d to push valve 1 to the right.

At this time, pressure PA of drain circuit “a” of the control valve is applied to the right end of valve 1 area of d1 to push valve 1 to the left. Valve 1 is balanced so that the back pres- sure PA will be as follows.

Standard Tolerance Standard clear- Clearance Clearance between connecting size ance limit Shaft Hole 1 pin and bushing of revolving frame and boom Komatsu FH Related Posts. Leave a Reply Cancel reply Your email address will not be published.

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В задней ее части располагались двенадцать терминалов, образуя совершенную окружность. Такая форма их размещения должна была способствовать интеллектуальному общению криптографов, напоминая им, что они всего лишь члены многочисленной команды – своего рода рыцари Круглого стола взломщиков кодов. По иронии судьбы в Третьем узле секреты не очень-то любили.

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