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Personal injury can result from rotating and moving parts. Stay clear of all rotating and moving parts. Never attempt adjustments while the machine is moving or the engine is running unless otherwise specified. The machine must be parked on a level surface and the engine stopped. Attach a "Do Not Operate" or similar warning tag to the start switch and controls before servicing, repairing, or making adjustments to the machine. |
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Personal injury or death can result from sudden machine movement. Sudden movement of the machine can cause injury to persons on or near the machine. To prevent injury or death, make sure that the area around the machine is clear of personnel and obstructions before operating the machine. |
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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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| 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 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 suitable to collect and contain fluids in Caterpillar machines. Dispose of all fluids according to local regulations and mandates. |
| Required Tools | |||
|---|---|---|---|
| Tool | Part Number |
Description | Qty |
| A (1) | 198-4234 | Pressure Gauge Tool Gp | 1 |
| B (1) | 198-4236 | Adapter Cable As | 1 |
| C | 198-4238 | Pressure Sensor Gp 0 to 35000 kPa (0 to 5000 psi) |
1 |
| D | 4C-6500 | Digital Thermometer | 1 |
| ( 1 ) | Tool (A) and Tool (B) are part of 198-4240 Digital Pressure Indicator . |
- Drive the machine to a smooth, horizontal surface.
- Move propulsion lever (1) to the NEUTRAL position.
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| Illustration 1 | g01407630 |
- Move parking brake switch (2) to the ON position.
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| Illustration 2 | g01407609 |
- Move throttle switch (3) to the LOW IDLE position.
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| Illustration 3 | g01407610 |
- Move engine start switch (4) to the OFF position.
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| Illustration 4 | g01407660 |
- Remove bolts (5) and remove right cover plate (6) .
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| Illustration 5 | g01408900 |
- Remove bolts (7) and remove left cover plate (8) .
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| Illustration 6 | g01408904 |
- Connect Tool (C) to Tool (B). Connect Tool (B) to Tool (A).
- Connect Tool (C) to charge pressure tap (9) on the drum propulsion pump.
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| Illustration 7 | g01408909 |
The Drum Pump is Shown From Left Side. | |
- Move engine start switch (4) to the START position. Release the switch when the engine starts.
- Operate the engine at low idle for few minutes. Move throttle switch (3) to the HIGH IDLE position.
- Monitor hydraulic oil temperature with Tool (D). Operate the machine until the oil reaches a temperature of 43 ± 5.6 °C (110 ± 10 °F).
- Read charge pressure on Tool (A). The pressure should be 2600 ± 250 kPa (377 ± 36 psi).
- Move throttle switch (3) to the LOW IDLE position.
- Move engine start switch (4) to the OFF position.
- If the pressure is inside the specified range, go to Step 25. If the pressure is outside the specified range, go to Step 17.
- Raise the cab. Refer to Disassembly and Assembly, KENR6413, "Cab - Tilt".
- Remove charge relief valve (10) on the drum pump.
 | |
| Illustration 8 | g01408913 |
The Drum Pump is Shown From Right Side. | |
- Remove the following components from the pump housing:
- Spool (11)
- Poppet (12)
- Shims (13)
- Spring (14)
- Spool (11)
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| Illustration 9 | g01408916 |
- Add shims (13) in order to increase pressure. Remove shims in order to decrease pressure.
Note: A change of 1 mm (0.04 inch) in shim thickness results in a pressure change of 390 kPa (57 psi).
- Install the following components in the pump housing:
- Spring (14)
- Shims (13)
- Poppet (12)
- Spool (11)
- Spring (14)
- Install charge relief valve (10) .
- Lower the cab but do not install cover plate (6) or cover plate (8). Refer to Disassembly and Assembly, KENR6413, "Cab - Tilt".
- Go to Step 10.
- Remove Tool (C) from charge pressure tap (9) .
- Lower the cab. Refer to Disassembly and Assembly, KENR6413, "Cab - Tilt".
- Replace cover plates (6) and (8). Install bolts (5) and (7) .