IT38H Integrated Toolcarrier and 938H Wheel Loader Braking and Hydraulic Fan System Service Brake System Pressure - Test Caterpillar


Service Brake System Pressure - Test
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Table 1
Required Tools    
Part Number     Description     Qty    
1U-5481     Pressure Gauge Group     1    


NOTICE

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, "AVSpare Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on AVSpare products.

Dispose of all fluids according to local regulations and mandates.


  1. Stop the engine. Place the transmission control in the NEUTRAL position. Engage the parking brake.

  1. Depress the brake pedal repeatedly in order to release all oil pressure from the brake circuit.



    Illustration 1g01419115

    Brake Control Valve

    (1) Test port for the rear service brakes

    (2) Test port for the front service brakes

  1. Remove the protective cap from test port (1) for the rear service brakes. Install a 0 to 15850 kPa (0 to 2300 psi) pressure gauge.

  1. Observe the pressure gauge. Before you start the engine, the oil pressure must be at the pressure of the hydraulic oil tank.

  1. Start the engine and allow the hydraulic oil to reach normal operating temperature and normal operating pressure.

  1. Hold down the brake pedal and look at the pressure gauge. The brake pressure should be at 3327 ± 224 kPa (483 ± 32 psi).

  1. If the brake pressure is not in the correct range but the brake accumulator charging valve is functioning correctly, replace the brake control valve.

  1. Repeat this procedure at test port (2) for the front service brakes.

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