Differential Lock Switch Replacement

Differential Lock Switch Replacement

Removal Procedure

1. Apply the parking brake.
2. Block the vehicle wheels.
3. Drain all of the air reservoirs. Refer to Draining Reservoirs in Air Brakes.





Important: Tag the air lines for later installation.


4. Remove the air lines at the differential lock control valve. Refer to Hose and Line Replacement - Nylon Push-In Type Fitting in Air Brakes.




5. Disconnect the wiring harness connector.
6. Remove the following components from the differential lock control valve:

* The nuts
* The washers
* The bolts
* Remove the differential lock control valve.

Installation Procedure

1. Install the differential lock control valve.

Notice: Refer to Fastener Notice in Cautions and Notices.

2. Install the following components to the differential lock control valve:

* The bolts
* The washers
* The nuts

Tighten the nuts to 13 Nm (115 lb in).




3. Connect the wiring harness connector.




4. Install the air lines at the differential lock control valve. Refer to Hose and Line Replacement - Nylon Push-In Type Fitting in Air Brakes.
5. Start the engine.
6. Inspect for air leaks. Refer to Air Brake System Testing in Air Brakes.
7. Verify proper operation of the inter-axle differential lock.
8. Remove the wheel blocks.