COUPLING 5R0086 - Caterpillar

Sudden movement of the machine or release of oil under pressure can cause injury to persons on or near the machine.To prevent possible injury, perform the procedure that follows before testing and adjusting the brake system.
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.
Note: Press the horn to alert personnel in the area.Note: Test the brakes on a dry, level surface. Make sure that the area around the machine is clear. Move the machine away from other operating machines and away from personnel.Note: If the machine is on stands, place the steering frame lock in the LOCKED position. Clear the area around the wheels in order to allow the wheels to rotate.Note: Engage the parking brake.
Table 1
Required Tools    
Part Number     Description     Quantity    
198-4240     Digital Pressure Indicator     1    
2G-5298     Wire     1    
Remove the access panel on the lower right side of the machine by the door.
Illustration 1 g00477474
Location of the Parking Brake Relay and Parking Brake Alarm Relay (1) Parking brake alarm relay (2) Parking brake relay
Disable the neutralizer by removing the parking brake alarm relay and the parking brake relay.
Illustration 2 g00477475
Jumper Wire Location (3) Location F3 (4) Location D5
Insert 2G-5298 Wire Assembly into the relay panel at locations F3 and D5.Note: This will supply the power to the directional control lever. The limit switch to the parking brake control lever will be ignored.
Remove the access panel on the lower right side of the machine under the battery compartment.
Illustration 3 g01052503
Pressure Tap Location for the High Pressure Oil of the Drive Loop (5) Pressure tap for the high pressure oil of the drive loop.
Install 198-4240 Digital Pressure Indicator to the pressure tap for the high pressure oil of the drive loop (5) .
Secure the digital pressure indicator so that the digital pressure indicator can be viewed during the test. Do NOT hold the digital pressure indicator.
Sit in the seat and fasten the seat belt.
Start the engine. Allow the machine to reach normal operating temperature.
With the machine at low idle, slightly raise the empty bucket or attachment. Push down and hold either brake pedal in order to apply the service brakes.
Recheck that the parking brake control lever is pulled completely upward.
Release the service brakes. Gradually press down the accelerator pedal until the machine moves. For the 914G, the digital pressure indicator should read 21500 6000 kPa (3120 870 psi). For the IT14G, the digital pressure indicator should read 20300 6000 kPa (2940 870 psi).
Reduce the engine speed. Lower the bucket or attachment to the ground. Stop the engine.
After repairing or replacing the parking brake components, perform this test again.
If the pressure is with the specification, disconnect the digital pressure indicator. Remove the 2G-5298 Wire Assembly. Install relays (1) and (2) and install the relay panel.