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Sudden movement of the machine or release of oil under pressure can cause injury to persons on or near the machine. To prevent possible injury, perform the procedure that follows before the test is done. |
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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, 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. |
| Tools Required | ||
| 4C4892 | Fittings Group | 1 |
- Before you do the testing and adjusting the following steps must be done:
- Apply the parking brake.
- Place the propel control lever in NEUTRAL position.
- Apply the parking brake.
- Remove the pin. Push the lock pin (1) in the hole that is in the yoke (2) .
Note: Straighten the machine so the pin will lock in place.
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| Illustration 1 | g00537550 |
Frame Lock Pin (1) Lock pin. (2) Yoke. | |
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| Illustration 2 | g00537555 |
Right Steering Cylinder (3) Line for right turn. | |
- Disconnect the pressure line (3) from the right steering cylinder. Install a tee and the 25000 kPa (3626 psi) pressure gauge in the cylinder port. The cylinder port is located at line (3). Connect line (3) to the tee. This gauge measures the steering relief valve pressure setting.
- Remove the plug for port (4) and install a 4000 kPa (580 psi) pressure gauge in port (4) for measuring the charge pressure.
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| Illustration 3 | g00537587 |
Brake Solenoid Valve Located in the Area of the Air Cleaner (4) Port for charge pressure for the "CB-534C" | |
- Start the engine and get the temperature of the hydraulic oil to 38 °C (100 °F). Put the engine speed at high idle and record the reading on the gauge for the charge pressure.
Note: The condition of the hydraulic filter can change the reading of the charge pressure. As the filter becomes plugged, the charge pressure will be lower. Replace the filter and recheck the gauge reading.
- Turn the steering wheel to the right until the steering relief valve opens. Record the reading on the gauge. The gauge reading from the charge pressure must be subtracted from the gauge reading from the steering relief valve. The relief valve pressure setting is 14000 ± 690 kPa (2031 ± 100 psi).
- If the steering system pressure is correct, stop the engine. Remove the pressure gauge and the tee from the steering cylinder. Reconnect the line (3). Disconnect the gauge from port (4). Move the lock pin (1) upward. Move the pin out of the yoke (2) .