Service Brake Holding Ability Test
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Personal injury can result if the machine moves while testing. If the machine begins to move during test, reduce the engine speed immediately and engage the parking brake. |
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Make sure that the area around the machine is clear of personnel and clear of obstacles.
Test the service brake on a dry, level surface.
Fasten your seat belt before you test the service brake.
The service brake holding ability test determines whether the service brake is functional. This test is not intended to measure the maximum brake holding effort.
The brake holding effort that is required to hold a machine at a specific engine rpm will be different for various machines. This is due to the following variances:
- engine setting
- engine power
- engine efficiency
- brake holding ability
When the machine begins to move, the engine rpm should be compared to a previous test. Use the comparison as an indication of system deterioration.
- Before you test the service brake, apply the parking brake. Move the transmission control to the NEUTRAL position. Start the engine. Allow the engine to fully charge the brake system.
- Apply the service brake. Move the transmission control to the FIRST SPEED FORWARD position. Release the parking brake.
- Gradually increase the engine rpm. The service brake should prevent the machine from moving away when the engine is running at 1700 rpm.
- If the machine moves, reduce the engine speed immediately and apply the parking brake. Move the transmission control to the NEUTRAL position. Machine movement indicates that the service brake system requires service.
The engine rpm should be 1700 rpm or more when the test is carried out. For future comparisons, record the actual engine rpm that is achieved during the test.
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If the machine moved while testing the service brakes, contact your Caterpillar dealer. Have the dealer inspect and, if necessary, repair the service brakes before returning the machine to operation. |
Parking Brake Check
The test for the parking brake must be carried out with the rated load in the body.
Test the service brakes and the secondary steering system on level ground before you carry out this procedure.
- Drive the machine onto an incline of 15%. The machine must be pointing down the incline.
- Engage the service brakes in order to stop the machine on the incline. The area around the machine must be clear of personnel and obstacles.
- Move the parking brake control to the ENGAGED position. Move the transmission control to the N position.
- Shut off the engine.
- Gradually disengage the service brakes.
- If the machine moves forward, engage the service brakes immediately. Start the engine. Disengage the parking brake and drive the machine onto level ground. Shut off the engine.
If the machine moved during the test, the parking brake requires service.
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If the machine moved while testing the parking brake, inspect the parking brake components for wear or damage. Repair or replace the worn or damaged parking brake components as required before returning the machine to service. |