 |
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. |
 |
| NOTICE |
|---|
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 Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids on Caterpillar products. Dispose of all fluids according to local regulations and mandates. |
- Disconnect any implements from the machine. Move the machine to a smooth horizontal surface. Move away from other machines and personnel.
- Permit only one operator on the machine. Keep all other personnel away from the machine.
| Tools Needed | ||
|---|---|---|
| Part Number | Description | Quantity |
| 6V-3965 | Nipple Assembly | 1 |
| 3J-1907 | O-Ring Seal | 1 |
| 8T-0855 | Pressure Gauge | 1 |
 | |
| Illustration 1 | g00509048 |
(1) Purge valve | |
- Remove purge valve (1) from either side on top of the center housing.
- Install the 8T-0855 Pressure Gauge onto the nipple assembly. This is a 0 to 4000 kPa (0 to 580 psi) pressure gauge.
- Start the engine. Run the engine at low idle.
- Warm the hydraulic oil to at least 60°C (140°F). At least two segments should be visible on the bargraph for hydraulic oil temperature.
- Run the engine at 1900 rpm. Depress the service brake pedal by 51 mm (2 inch).
- The brake hydraulic pressure should be approximately 1720 kPa (249.5 psi).
Note: Movement of the service brake pedal causes the pressure to vary greatly.
- Ensure that there are no leaks in the system.
- Make sure that the brake hydraulic pressure does not decrease gradually.
Note: If the brake hydraulic pressure decreases, see Systems Operation/Testing and Adjusting, "Brake System Leakage Test" for more information.
- Make sure that the brake hydraulic pressure does not decrease gradually.
- Stop the engine.