WRENCH- 4783990 - Caterpillar

Service Brake Holding Ability Test
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.Fasten the seat belt before you test the brakes.The following tests are used to determine if the service brake is 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. Note: In order to perform this test, the inching valve will need to be neutralized.
Illustration 1 g00708722
The master cylinder is located under the cab on the left side of the machine. Rod (1) connects the inching valve to the master cylinder for the service brakes.
Disconnect rod (1) from lever (2) .Note: Lever (2) must be fully forward in order to prevent the inching valve from actuating during the remainder of the test procedure.
Start the engine. Raise the bucket slightly.
Apply the service brake. Release the parking brake.
Move the direction control lever to FORWARD.
Gradually increase the engine speed to the middle RPM range. The machine should not move.
If the machine begins to move, reduce the engine speed immediately and engage the parking brake.
Reduce the engine speed to low idle. Move the direction control lever to NEUTRAL. Engage the parking brake. Lower the bucket to the ground. 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
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.Fasten the seat belt before you test the brakes.The following tests are used to determine if the parking brake is 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 will vary 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.
Remove the plate in order to access the relay assembly. The plate is located on the lower right side of the cab by the door.
Illustration 2 g00708724
Location of the relay for the parking brake and the relay for the back up alarm (1) Relay for the parking brake. (2) Relay for the back up alarm.
Disable the neutralizer by removing the relay for the parking brake (1) and the relay for the back up alarm (2) .
Illustration 3 g00708725
Jumper Wire Location (3) Location B5. (4) Location C3.
Insert 2G-5298 Wire Assembly into the relay assembly. Insert one end of the wire assembly into location B5 (3). Insert the other end of the wire assembly into location C3 (4) .Note: This will