- Track-Type Tractor:
- D11R (S/N: AAF1-200; 9XR1-UP; 7PZ1-651)
Introduction
The hydraulic fan system and the pilot system have been improved. This special instruction provides the procedures to improve your hydraulic fan system and your pilot system. The procedures include adding a check valve at the discharge of the large fan pump and adding a restrictor valve to the discharge of the small pump. The check valve will isolate the large fan pump from the small fan pump. The restrictor valve will provide a regulated pressure to the pilot system even when the fan system is overrunning.
You should consider installing the new valves on your machine if you have experienced one of the following conditions:
- The service life of the large fan pump is unusually short and the pump port plate shows signs of erosion.
- You experience problems in the pilot system during rapid deceleration.
Refer to the necessary parts list for ordering parts.
After the installation of the new valves is complete, prepare the machines for service. Follow the procedure in the Operation and Maintenance Manual.
Safety
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Do not attempt to assemble this machine until you read and you understand the assembly instructions. Improper assembly procedures could result in injury or death. |
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Personal injury can result from hydraulic oil pressure and hot oil. Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system. Make sure all of the attachments have been lowered, and the oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand. |
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Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the machine. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop Products Guide"for tools and supplies to collect and contain fluids in Caterpillar machines. Dispose of all fluids according to local regulations. |
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Do not allow any dirt or foreign material to get into the hydraulic system during assembly, connection of lines, when components are filled with fluid, or during any maintenance operation. |
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Maintain the oil in the hydraulic system at the correct level to prevent pump cavitation. |
Necessary Parts
| Necessary Parts | |||
| Item | Qty | Pt. No. | Description |
| 1 | 1 | 5G-8290 | Hose As (1) |
| 2 | 1 | 9J-3866 | Adapter |
| 3 | 4 | 116-7209 | Bolt |
| 4 | 1 | 213-5202 | Tube As |
| 5 | 1 | 214-4159 | Hose As (1) |
| 6 | 1 | 226-6537 | Valve Group |
| 7 | 3 | 1P-3703 | Rectangular Seal |
| 8 | 4 | 7X-0290 | Bolt |
| 9 | 6 | 6V-8397 | O-Ring Seal |
| 10 | 1 | 6V-9850 | Swivel Elbow |
| 11 | 2 | 3J-1907 | O-Ring Seal |
| 12 | 1 | 6V-8781 | Face Seal Tee |
| 13 | 1 | 3K-0360 | O-Ring Seal |
| 14 | 1 | 6V-8634 | Connector |
| 15 | 1 | 3J-7354 | O-Ring Seal |
| 16 | 1 | 6V-9872 | Connector |
| 17 | 1 | 6V-8724 | Elbow |
| ( 1 ) | Part numbers for hose assemblies are for reference. Refer to the Hydraulic Information System (HIS) in order to manufacture hose assemblies. |
Machine Preparation
- Move the machine to a smooth horizontal location. Move away from machines that are working. Move away from personnel. Lower implements to the ground.
- Permit only one operator on the machine. Keep all other personnel away from the machine or keep personnel in the view of the operator.
- Engage the parking brake.
- Stop the engine.
- Turn the key to the ON position. Move the hydraulic control levers to all positions in order to release the pressure in the hydraulic system. Move the control lever to the FLOAT position.
- Use the vacuum breaker that is on the top of the hydraulic tank to release the pressure in the tank.
- Make sure that all of the hydraulic pressure is released before any fitting, any hose, or any component is loosened, tightened, removed or adjusted.
- The pressure in the system has now been released and lines or components can be removed.
- Drain the hydraulic tank at the drain port. Collect the hydraulic oil in a suitable container.
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| Illustration 1 | g00946019 |
- Remove the floorplate.
Removing the Current Components
- Remove tube (E) from the rear pump.
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| Illustration 2 | g00950403 |
- Remove existing valve group (B), quick disconnect (D), and pressure sensor (A) from the bottom of the fan pumps.
Note: Pressure sensor (A) will be used in the new valve group. Also, hose assembly (C) to the fan motor will be reused.
- Remove hose assembly (G) from the tee that was on existing valve group (B) and from solenoid valve (F) .
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| Illustration 3 | g00950402 |
Installation of the New Components
- Install pressure sensor (A) into valve group (6) next to restrictor valve (H). Install valve group (6) onto the front fan pump with four bolts (3).
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| Illustration 4 | g00949208 |
Bottom View of Fan Control Valve For clarity, several of the components have been removed from this illustration. | |
- Assemble O-ring (11), two O-rings (9), and tee (12). Install this tee assembly on purge valve (J) that is on the right hand rail. Assemble O-ring (9) and elbow (10). Connect this elbow assembly to the end of the tee assembly.
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| Illustration 5 | g00947951 |
For clarity, several of the components have been removed from this illustration. | |
- Assemble O-ring (15), connector (16), and O-ring (9). Install this connector assembly into the side of valve group (6). Connect hose assembly (1) to this connector assembly and to the tee assembly from Step 2.
- Use bolts (8) to assemble one rectangular seal (7), adapter (2), tube assembly (4), and one rectangular seal (7) to the rear pump. Use existing bolts (K) to connect tube assembly (4) and one rectangular seal (7) to valve group (6) .
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| Illustration 6 | g00947949 |
For clarity, several of the components have been removed from this illustration. | |
- Assemble O-ring (11), elbow (17), and O-ring (9). Install this elbow assembly into the front side of adapter (2) .
- Reroute existing hose assembly (L) from pilot filter (M) to the elbow assembly from Step 5. Connect the straight end of the hose assembly to pilot filter (M) .
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| Illustration 7 | g00947950 |
For clarity, several of the components have been removed from this illustration. | |
- Assemble O-ring (13), connector (14), and O-ring (9). Install this connector assembly in the right hand side of valve group (6). Connect hose assembly (5) to fan control solenoid valve (F) and the connector assembly.
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| Illustration 8 | g00947947 |
For clarity, several of the components have been removed from this illustration. | |
- Use existing hardware to reconnect hose assembly (C) to valve group (6) .