793B Off-Highway Truck Air System and Brakes Caterpillar


Relief Valve (Electric Drive Pump) - Adjust

Usage:

793B 1HL

Table 1
Tools Needed  Qty 
6V-3079 Pressure Hose Assembly 
6V-4143 Coupler Assembly 
8T-0857 Pressure Gauge ( 0 to 10000 kPa (0 to 1450 psi)

  1. Stop the engine.


    Illustration 1g00297279
    Location of the pressure taps for the parking brake release pressure

  2. Install a 8T-0857 Pressure Gauge ( 0 to 10000 kPa (0 to 1450 psi)) to one of the pressure taps for the parking brake release pressure.

  3. Turn the engine start switch to the ON position.


    Illustration 2g00280798
    Switch for the electric powered parking and secondary brake release pump

  4. Move the switch for the electric powered parking and secondary brake release pump to the ON position. Hold the switch until the pressure that is shown on the pressure gauge stops rising.

  5. The minimum pressure on the gauge should be 3792 kPa (550 psi). The maximum pressure on the gauge should be 4481 kPa (650 psi).


    Illustration 3g00297265
    Relief valve

  6. Turn the relief valve at the electric powered parking and secondary brake release pump in order to make any adjustments.

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