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Sudden movement of the machine or release of oil under pressure can cause serious injury to persons on or near the machine. To prevent possible injury, perform the procedure that follows before testing and adjusting the hydraulic system. |
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Injury to personnel can result if they are not in the operator's view. Allow only essential personnel near the machine, and make sure the personnel are in the operator's view when testing, to prevent injury. Make sure checks are done in an open area. |
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Personal injury can result from rotating and moving parts. Moving fan blades and moving parts will throw or cut any object or tool that falls or is pushed into them. Make sure no one is working on, underneath or close to an engine that is running. Make sure the area is free of personnel. |
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| NOTICE |
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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 product. 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 Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Caterpillar products. Dispose of all fluids according to local regulations and mandates. |
| Required Tools | |||
|---|---|---|---|
| Tool | Part Number |
Description | Qty |
| A | 6V-7830 | Pressure Gauge (Tetragauge) |
2 |
| B | 6V-9828 | Cap As | 1 |
| C | 6V-9507 | Plug (ORFS) |
1 |
| 4J-5477 | O-Ring Seal | 1 | |
| D | 6V-9829 | Cap As | 2 |
| E | 6V-9508 | Plug (ORFS) |
2 |
| 6V-8397 | O-Ring Seal | 2 | |
| F | 110-6349 | Fitting As | 2 |
| 3J-7354 | O-Ring Seal | 2 | |
| G | 4C-6500 | Digital Thermometer | 1 |
Note: This procedure centers the displacement control valve. The procedure Systems Operation, Testing and Adjusting, "Piston Pump Neutral (Drum) - Test and Adjust" in this publication should be performed before the following procedure is performed.
- Drive the machine to a smooth, horizontal surface.
- Move propel lever (1) to the NEUTRAL position.
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| Illustration 1 | g02091114 |
- Move parking brake switch (2) to the ON position.
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| Illustration 2 | g02091115 |
- Move throttle control switch (3) to the LOW IDLE position.
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| Illustration 3 | g02097153 |
- Move engine start switch (4) to the OFF position.
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| Illustration 4 | g02091116 |
- Block the wheels. Block the drum.
- Raise the cab. Refer to Disassembly and Assembly, KENR8176, "Cab - Tilt".
- Remove bolts (5) and the washers from the rear of side panel (6) .
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| Illustration 5 | g02097475 |
- Remove bolts (7) and the washers from the front of side panel (6). Remove side panel (6) .
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| Illustration 6 | g02097476 |
- Disconnect brake supply line (8) from the drum. Install Tool (B) on the port. Hand tighten Tool (B) on the port. Then, loosen the cap by one-half turn. Some oil may escape from the port when the brake seats. Contain any leakage, and dispose of the oil in accordance with local regulations and mandates. Use Tool (C) to plug the hose.
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| Illustration 7 | g02098993 |
- Disconnect hose (9) from the test block. Use Tool (E) to plug the hose. Use Tool (D) to cap the port.
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| Illustration 8 | g02101894 |
Note: Hose (9) and hose (10) are disconnected from the block in the next two steps in order to isolate the axle pump from the drum pump. The test block contains balance orifices.
- Disconnect hose (10) from the test block. Use Tool (E) to plug the hose. Use Tool (D) to cap the port.
- Remove plug (11) from port "M5". Install Tool (F) in port "M5".
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| Illustration 9 | g02101918 |
- Remove plug (12) from port "M4". Install Tool (F) in port "M4".
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| Illustration 10 | g02101933 |
- Connect one Tool (A) to Tool (F) in port "M4". Connect other Tool (A) to Tool (F) in port "M5".
- Remove key (13) and remove pin (14) from bracket (15). Move cable (16) out of the way.
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| Illustration 11 | g02101935 |
- Remove locknut (17) and washer (18) at the bottom of bracket (15). Remove bolt (19), washer (20), and washer (21) from the bracket. Move tie rod (22) out of the way.
Note: The locknut must be replaced before reassembly. Do not reuse the original locknut.
- Move engine start switch (4) to the START position. Release the switch when the engine starts.
- Move shift switch (23) to the HIGH SPEED position.
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| Illustration 12 | g02101953 |
- Operate the engine at low idle for a few minutes. Move throttle switch (3) to the HIGH IDLE position.
- Monitor the hydraulic oil temperature with Tool (G). Operate the machine until the oil temperature reaches 43 ± 6 °C (110 ± 10 °F).
- Move parking brake switch (2) to the OFF position.
- Loosen locknut (24). Watch the pressure on the gauges. If necessary, rotate adjustment screw (25) until the pressure is equal on both gauges.
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| Illustration 13 | g02101954 |
Drum Pump is Shown From Right Side | |
- Rotate adjustment screw (25) counterclockwise until the pressure at port "M4" (12) just begins to increase. Note the angular position of the wrench.
- Rotate adjustment screw (25) clockwise until the pressure at port "M5" (11) just begins to increase. Note the angular position of the wrench.
- Rotate adjustment screw (25) to the center of the two positions noted above. Hold the adjustment screw in place and tighten locknut (24) to a torque of 31 to 50 N·m (23 to 37 lb ft).
Note: Make sure that the pressure does not change when locknut (24) is tightened.
- Move parking brake switch (2) to the ON position.
- Move throttle control switch (3) to the LOW IDLE position.
- Move engine start switch (4) to the OFF position.
- Remove Tool (E) from hose (10) and remove Tool (D) that is on the port for the test block. Reconnect hose (10) to the test block.
- Remove Tool (E) from hose (9) and remove Tool (D) from the port on the test block. Reconnect hose (9) to the test block.
- Remove Tool (A), and remove Tool (F) from port "M5". Install plug (12) .
- Remove Tool (A), and remove Tool (F) from port "M4". Install plug (11) .
- Install bolt (19) and washer (20) in tie rod (22). Install washer (20) on the bolt and place the bolt through hole bracket (15) .
- Install washer (18) and locknut (17) on bolt (19). Tighten the locknut.
Note: The locknut must be replaced before reassembly. Do not reuse the original locknut.
- Hold cable (16) in position, and install pin (14) in bracket (15). Install key (13) in the pin.
- Remove Tool (C) and Tool (D). Reconnect brake supply line (8) to the drum motor.
- Hold side panel (6) in position, and install washers and bolts (5) .
- Hold side panel (6) in position, and install washers and bolts (7) .
- Lower the cab. Refer to Disassembly and Assembly, KENR8176, "Cab - Tilt".