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Escaping fluid under pressure, even a pinhole size leak, can penetrate body tissue, causing serious injury, and possible death. If fluid is injected into your skin, it must be treated immediately by a doctor familiar with this type of injury. Always use a board or cardboard when checking for a leak. |
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Personal injury or death can result if two persons are not used in the following procedure. |
| 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, PERJ1017, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat® products. Dispose of all fluids according to local regulations and mandates. |
| Service Brake Pressure | |
| Pump Pressure | Setting |
| Service Brake Valve(1) | |
| (1) | For both Front and Rear Brakes |
| Hand Retarder Brake System | |
| Description | Specification |
| Hand retarder brake pressure with park brake released and throttle depressed, then fully apply hand retarder lever 100 % and record brake pressure off dash display screen. | |
| With park brake released record the retarder lever position % when lever is fully applied off dash display screen. | 8 ± 2% |
| With park brake released record retarder lever output % when lever is fully applied off dash screen. | 77 ± 5% |
This information includes the following test:
- Service Brake System
- Hand Retarder Brake System
This information includes the following adjustment:
- Service Brake System
- Hand Retarder Brake System
| Required Tools | |
| Part Number | Description |
| 8T-0857 | Pressure Gauge (0 TO 10,000-KPA (0 TO 1450-PSI)) |
Note: All tests and all adjustments must be made while the hydraulic oil is at normal operating temperature.
- Park the machine on a smooth, level surface.
- Place the transmission in the NEUTRAL position.
- Engage the parking brake.
- Stop the engine.
- Place blocks in front of the wheels and behind the wheels.
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Illustration 1 g06241215 - Move the steering frame lock in the LOCKED position.
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Illustration 2 g06148030 - Lift and hold knob (1) for 5 seconds to release pressure oil in the hydraulic accumulator.
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Illustration 3 g06235428 - Slowly remove hydraulic tank filler cap (2) to relieve any pressure in the hydraulic tank.
Reference: For information about preparing a machine for troubleshooting, refer to the Testing and Adjusting, "Machine Preparation for Troubleshooting" for the machine that is being serviced.
- Remove the protective cap from test port (2) to test the oil pressure of the service brakes. Install a
0 to 10000 kPa (0 to 1450 psi) pressure gauge. - Start the engine and allow the hydraulic oil to reach normal operating temperature and normal operating pressure.
- If the brake pressure is not in the correct range but the brake accumulator charging valve is functioning correctly, replace the brake control valve.
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| Illustration 4 | g06238636 |
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Location of Brake Control Valve (1) is located under the pedal assembly on the floor of the cab. | |
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| Illustration 5 | g06295474 |
| (2) Test port for service brakes | |