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

There must be no air in the hydraulic oil. Air in the system can prevent the complete application of the brakes.

Service Brakes

1. Move the machine to a hard, level surface that is dry and free of debris.

2. Install the steering frame lock.

3. Set the parking brake.

4. Check the oil level in the hydraulic tank for the steering system and for the braking system. Keep the hydraulic tank full during the procedure.

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Illustration 1	g00110073
Typical Air Purge Screw for the Service Brakes (1) Air purge screw.

5. Connect a hose to air purge screw (1). Put the other end of the hose in a clear container.

6. Start the engine and run the engine at low idle.

7. Open air purge screw (1) so that oil can flow through the hose. Depress the brake pedal until the flow of oil from the hose is free of air bubbles.

8. Close the air purge screw. Repeat this procedure for each service brake, but purge only one service brake at a time.

9. Fill the hydraulic oil tank to the correct level.

10. If the service brakes seem spongy during operation, perform the procedure again.

Parking Brake

1. Place wood blocks in front of the tires and behind the tires.

2. Start the engine and allow the oil pressure to reach the cutout pressure. Stop the engine.

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Illustration 2	g00110072
Parking Brake Control Knob

3. Push in the parking brake control knob.

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Illustration 3	g00110116
Air Purge Screw for the Parking Brake (2) Air purge screw.

4. Connect a hose to air purge screw (2) on the side of the parking brake housing. Put the other end of the hose in a clear container.

5. Slowly open air purge screw (2) so that oil can flow through the hose. Allow the oil to flow until there are no air bubbles in the oil. Close the air purge screw.