AD30 Underground Articulated Truck Braking System General Information Caterpillar


General Information
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------ WARNING! ------

Sudden movement of the machine or release of oil under pressure can cause injury to persons on or near the machine.

To prevent possible injury, perform the procedure that follows before testing and adjusting the brake system.

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Note: Permit only one operator on the machine. Keep all other personnel away from the machine or in the operator's sight.

  1. Move the machine to a smooth, horizontal location. Move away from operating machines and away from other personnel.

  1. Move the transmission control to the NEUTRAL position.

  1. Engage the parking brake.

  1. Install the steering frame lock.

  1. Put wheel blocks in front of the wheels and behind the wheels.



    Illustration 1g00994589

    Retaining pin for the dump body

  1. If it is necessary to raise the dump body of the truck, install the body retaining pins.



    Illustration 2g01025172

    Retaining pin for the tailgate

  1. If it is necessary to work around the tailgate, install the tailgate retaining pins.

  1. Stop the engine.

  1. Depress the service brake pedal at least 70 times to remove the oil pressure from the brake accumulators.

  1. Make sure that all oil pressure is released before any fitting, hose or component is loosened, tightened, removed, or adjusted.

Note: The hydraulic system involves the operation of the brakes, the brake cooling, and the hoist. The troubleshooting for the hydraulic system in this section deals with the brakes and the brake cooling system. Refer to Hydraulic System, Systems Operation, Testing and Adjusting for more information about the hydraulic system for the hoist.

Troubleshooting can be difficult. There is a list of possible problems on the following pages. In order to repair a problem, refer to the problem and the probable causes that are listed below.

This list of problems and probable causes will only give an indication of the existence of a possible problem and of the repairs that may be required. There are sometimes more repairs or other repairs that are required beyond the recommendations that are in the list. Remember that a problem is not normally caused by only one part. A problem is usually caused by the relation of one part with other parts. This list can not provide all possible problems and all probable causes. The service person must find the problem and the source of the problem. The service person must then perform the necessary repairs.

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