992K Wheel Loader and 854K Wheel Dozer Braking System Caterpillar

Parking Brake System Pressure - Test

Usage:

992K 880

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Hot oil and hot components can cause personal injury. Do not allow hot oil or hot components to contact skin.

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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, "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.

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Illustration 3	g06217556
(Typical Example) Standard Pressure Tap Location (8) Rear brake accumulator pressure (12) Front brake accumulator pressure

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Illustration 4	g06212613
(Typical Example) Remote Pressure Tap Location (If Equipped) (4) Pilot supply (Steering) (5) Steering pump pressure (6) Rear brake pressure (7) Front brake pressure (8) Rear brake accumulator pressure (9) Left steering cylinder pressure (10) Right steering cylinder pressure (11) Brake pump pressure (12) Front brake accumulator pressure

Attach a hydraulic hose and a 0 to 28000 kPa (0 to 4000 psi) pressure gauge to pressure port (8).
Start the engine and allow the accumulator oil pressure to increase to the cut-in pressure.
Note: When the engine is running, the accumulator oil pressure will continue to increase to approximately 13790 kPa (2000 psi).
Push in the parking brake control knob and stop the engine.
Depress the brake pedal repeatedly until the parking brake control knob automatically moves out to the ENGAGED position.
Look at the reading on the pressure gauge. The correct hydraulic oil pressure that automatically engages the parking brake should be below 6035 ± 515 kPa (875 ± 75 psi).
If the reading on the pressure gauge is not correct, the operation of the parking brake control valve is not correct.
Inspect the parking brake control valve for parts that are worn or damaged. If any parts are worn or damaged, replace the parking brake control valve.
Remove the test equipment.