Hydraulic System, Brakes

Fig. 8 Hydraulic Pressure Relief Valve:

Prior to performing any service on the hydraulic system, relieve system pressure by turning pressure relief valve 1/2 turn, Fig. 8. Failure to release hydraulic pressure may cause damage or personal injury.

1. Check hydraulic fluid level, fill as required.
2. Release hydraulic pressure as follows:
a. Open pressure relief valve about 1/2 turn.
3. Connect pressure tester tool No. 126 589 14 21 00 or equivalent, to high pressure hose valve.
4. Start engine, ensuring system is depressurized.
5. If pressure is below below 1888 psi (133 bar), replace hydraulic pump.