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797F and 797F XQ Off-Highway Trucks Visual Service Procedure (VSP) Maintenance Intervals Caterpillar


Braking System - Test

Usage:

797F LAJ

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------ WARNING! ------

Personal injury can result if the machine moves during testing. If the machine begins to move during testing, reduce the engine speed immediately and place the transmission control in the P position in order to engage the parking brake.

The following tests are used to determine if the service brake system, the secondary brake system, and the parking brake system are functional. These tests are not intended to measure the maximum brake holding effort. The brake holding effort that is required to sustain a machine at a specific engine rpm varies depending on the machine. The variations are the differences in the engine setting, in the power train efficiency, and in the brake holding ability, and so forth.

During the test of the brakes, compare the previous engine rpm and the recent engine rpm. This comparison will determine the system deterioration.

Start By:

a. Prepare the machine for maintenance. Refer to Operation and Maintenance Manual, "Prepare the Machine for Maintenance".

Service Brake Holding Ability Test

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    Illustration 1g06113674

  1. Ensure that the machine is on a dry level surface.

  2. Check the area around the machine. Make sure that the machine is clear of personnel and clear of obstacles.
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    Illustration 2g06113694

  1. Fasten the seat belt before you test the brakes.

  2. Start the engine.

  3. Depress the service brake control to apply the service brakes.

  4. Move the transmission control to the D position.

  5. Gradually increase the engine speed to 1300 rpm.
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    Illustration 3g06113695

  1. Check to ensure that the machine does not move. If the machine moved while testing the brakes, contact your Cat dealer.

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NOTICE

If the machine moved while testing the brakes, contact your Cat dealer.

Have the Cat dealer inspect and, if necessary, repair the parking/secondary brakes before returning the machine to operation.

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    Illustration 4g06113696

  1. Release the throttle, and allow the engine speed to return to idle.

  2. Move the transmission control to the P - Park Brake Applied position.

  3. Release the service brake control.

  4. Stop the engine.

Secondary Brake Holding Ability Test

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    Illustration 5g06113674

  1. Ensure that the machine is on a dry level surface.

  2. Check the area around the machine. Make sure that the machine is clear of personnel and clear of obstacles.
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    Illustration 6g06113690

  1. Fasten the seat belt before you test the brakes.

  2. Start the engine.

  3. Depress secondary brake control to apply the secondary brakes.

  4. Move the transmission control to the D position.

  5. Gradually increase the engine speed to 1300 rpm.
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    Illustration 7g06113691

  1. Check to ensure that the machine does not move. If the machine moved while testing the brakes, contact your Cat dealer.

Show/hide table
NOTICE

If the machine moved while testing the brakes, contact your Cat dealer.

Have the Cat dealer inspect and, if necessary, repair the parking/secondary brakes before returning the machine to operation.

    Show/hide table
    Illustration 8g06113692

  1. Release the throttle, and allow the engine speed to return to idle.

  2. Move the transmission control to the P - Park Brake Applied position.

  3. Release the secondary brake control.

  4. Stop the engine.

Parking Brake Holding Ability Test

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    Illustration 9g06113674

  1. Ensure that the machine is on a dry level surface.

  2. Check the area around the machine. Make sure that the machine is clear of personnel and clear of obstacles.
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    Illustration 10g06113678

  1. Fasten the seat belt before you test the brakes.

  2. Start the engine.

  3. Depress the button for the high gear limit raise and depress the button for the high gear limit lower at the same time, and move the transmission control to the D position.

    Note: The buttons can be released when the transmission control is in the D position, and the parking brake will remain on.

  4. Gradually increase the engine speed to 1300 rpm.
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    Illustration 11g06113684

  1. Check to ensure that the machine does not move. If the machine moved while testing the brakes, contact your Cat dealer.

Show/hide table
NOTICE

If the machine moved while testing the brakes, contact your Cat dealer.

Have the Cat dealer inspect and, if necessary, repair the parking/secondary brakes before returning the machine to operation.

    Show/hide table
    Illustration 12g06113687

  1. Release the throttle, and allow the engine speed to return to idle.

  2. Move the transmission control to the P - Park Brake Applied position.

  3. Stop the engine.

Caterpillar Information System:

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