R2900 Load Haul Dump Automatic Brake Application System (Low Transmission Oil Pressure) - Test - If Equipped Caterpillar


Automatic Brake Application System (Low Transmission Oil Pressure) - Test - If Equipped
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Certain AVSpare machines may be equipped with an optional Automatic Brake Application (ABA) system.

The ABA system warns the operator of an impending brake application (low transmission oil pressure) and applies the parking brake if the pressure further decreases, e.g. engine stalled.

If your machine is equipped with the optional ABA system, perform the following test to check that the system is functioning correctly.

Note: Before testing the operation of the Automatic Brake Application (ABA) system, test the holding ability of the machine parking brake.

Reference: For more information on testing the parking brake holding ability, refer to the Operation and Maintenance Manual, "Braking System - Test" for the machine that is being serviced.

  1. Be sure the area around the machine is clear of personnel and obstructions.



    Illustration 1g00945602

  1. Disconnect hose assembly (1) from the manifold on the rear frame crossmember.

  1. Install a 8S-4950 Cap (9/16-18 JIC) on the manifold tee fitting where the hose was removed.

  1. Start the engine and raise the bucket slightly.



    Illustration 2g00945603

  1. Move parking brake control to the OFF position.

  1. Move the transmission direction and speed control to the SECOND SPEED FORWARD position.

  1. Gradually increase the engine speed to high idle. The parking brake should remain engaged and the machine should not move.

    Note: The parking brake indicator and the action lamp should flash and the action alarm should sound. The Impending Brake Application (IBA) indicator should be illuminated.

  1. Reduce the engine speed to low idle, move the transmission direction and speed control to the NEUTRAL position. Engage the parking brake. Lower the bucket to the ground and stop the engine.


    NOTICE

    If the parking brake disengaged and the machine moved while testing the Automatic Brake Application (ABA) system, have the system inspected and repaired immediately before returning the machine to operation. Contact your AVSpare dealer or refer to the Braking Section of the machine Service Manual.

    Operating the machine with a defective ABA system may result in serious personal injury or death.


  1. Remove the cap from the tee fitting and reconnect hose assembly (1) to the manifold.

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