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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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| 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 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. |
| Required Tools | |||
|---|---|---|---|
| Tool | Part Number | Description | Qty |
| A | 198-4234 | Digital Pressure Indicator | 1 |
| 198-4238 | Pressure Gauge 0 - 35000 kPa (0 - 5000 psi) |
1 | |
| B | 7X-2444 | Swivel Tee | 1 |
| C | 6V-3965 | Nipple | 1 |
| D | 4C-6500 | Digital Thermometer | 1 |
Note: Perform the Relief Valve (Charge)–Test and Adjust before you perform this test.
Note: Perform the following steps before conducting this procedure:
- Park the machine on a flat, level surface.
- Place the propel control lever in NEUTRAL.
- Engage the parking brake.
- Stop the engine.
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| Illustration 1 | g01085258 |
- Install Tools B and C in the BR port of brake manifold (1) .
- Connect the sensor from Tool A to Tool C.
- Start the engine. Operate the engine at 2250 rpm (high idle). Monitor the hydraulic oil temperature with Tool D. Operate the machine until the oil temperature reaches 43° ± 5.6°C (110° ± 10°F).
- With the propel lever in NEUTRAL, release the parking brake. Read the pressure on Tool A. The pressure should be a minimum of 1930 kPa (280 psi).
- Stop the engine.
- If the pressure is lower than the specification, troubleshoot the parking brake system.
- If the pressure is correct, remove the tooling.