Two Speed Rear Axle Pressure Protection Valve Replacement

Two Speed Rear Axle Pressure Protection Valve Replacement

Removal Procedure

1. Block the wheels.
2. Drain all of the air reservoirs. Refer to Draining Reservoirs in Air Brakes.

Important: Tag the air lines for later installation.


3. Remove the air lines at the two-speed rear axle pressure protection valve. Refer to Air Brakes.
4. Remove the following components from the two-speed rear axle pressure protection valve:

* The nuts
* The washers
* The bolts

5. Remove the two-speed rear axle pressure protection valve at the brake pedal bracket.
6. Inspect the air lines for the following conditions:

* Damage
* Kinks
* Wear

7. Repair or replace the air lines as needed. Refer to Hose and Line Replacement - Nylon and Metal Compression in Air Brakes.

Installation Procedure

1. Install the two-speed rear axle pressure protection valve at the brake pedal bracket.

Notice: Refer to Fastener Notice in Cautions and Notices.

2. Install the following components to the two-speed rear axle pressure protection valve:

* The bolts
* The washers
* The nuts

Tighten the two-speed rear axle pressure protection valve nuts to 13 Nm (106 lb in).

3. Install the air lines at the two-speed rear axle pressure protection valve. Refer to Hose and Line Replacement - Nylon and Metal Compression in Air Brakes.
4. Start the engine. Charge the system to the air compressor governor cutout point.
5. Stop the engine.
6. Inspect for air leaks using a soap solution.
7. Remove the wheel blocks.