EXPANDER G- 6V4020 - Caterpillar

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.
The following tests are used to determine if the service brake, the secondary brake and the parking brake 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, etc. During the test of the brakes, compare the previous engine rpm and the recent engine rpm. This will determine the system deterioration.Service Brake Holding Ability Test
Fasten the seat belt before you test the brakes.
Check the area around the machine. Make sure that the machine is clear of personnel and clear of obstacles.
Test the brakes on a dry, level surface.
Start the engine. Allow the air system to build up to the operating pressure.
Illustration 1 g00715528
Apply the service brake pedal.
Release the parking brake.
Move the transmission direction and speed control lever to the FIRST SPEED FORWARD position.
Gradually increase the engine speed to 1200 rpm. The machine should not move.
Reduce the engine speed to low idle. Move the transmission direction and speed control lever to the NEUTRAL position. Engage the parking brake switch. Stop the engine.
If the machine moved while testing the brakes, contact your Caterpillar dealer.Have the dealer inspect and, if necessary, repair the service brake before returning the machine to operation.
Secondary Brake Holding Ability Test
Fasten the seat belt before you test the brakes.
Check the area around the machine. Make sure that the machine is clear of personnel and clear of obstacles.
Test the brakes on a dry, level surface.
Start the engine and allow the air system to build up to the operating pressure.
Illustration 2 g00715529
Apply the secondary brake control pedal.
Release the parking brake switch.
Move the transmission direction and speed control lever to the FIRST SPEED FORWARD position.
Gradually increase the engine speed to 1200 rpm. The machine should not move.
Reduce the engine speed to low idle. Move the transmission direction and speed control lever to the NEUTRAL position. Engage the parking brake. Stop the engine.
If the machine moved while testing the brakes, contact your Caterpillar dealer.Have the Caterpillar dealer inspect and, if necessary, repair the parking/secondary brakes before returning the machine to operation.
Parking Brake Holding Ability Test
Fasten the seat belt before you test the brakes.
Check the area around the machine. Make sure that the machine is clear of personnel and clear of obstacles.
Test the brakes on a dry, level surface.
Start the engine and allow the air system to build up to the operating pressure.
Illustration 3 g00715530
Engage the parking brake switch.
Move the transmission direction and speed control lever to the FIRST SPEED FORWARD position.
Gradually increase the engine speed to 1200 rpm. The machine should not move.
Reduce the engine speed to low idle. Move the transmission direction and speed control lever to the NEUTRAL position. Leave the