Two Speed Rear Axle Shift Motor Replacement (HR2)

Two Speed Rear Axle Shift Motor Replacement (HR2)

Removal Procedure




1. Apply the parking brake.
2. Block the wheels.
3. Shift the two-speed rear axle shift control valve to the LOW range.
4. Drain all of the air reservoirs. Refer to Draining Reservoirs in Air Brakes.
5. Remove the air line at the two-speed rear axle shift motor. Refer to Hose and Line Replacement - Nylon and Metal Compression in Air Brakes.
6. Remove the two-speed rear axle shift motor mounting stud nuts (1) and the washers (2).
7. Remove the two-speed rear axle shift motor (3).
8. Remove the two-speed rear axle spring (7) from the two-speed rear axle shift fork (5).
9. Remove the two-speed rear axle shift fork seal (6) from the differential carrier housing (4).
10. Inspect the air lines for the following conditions:

* Damage
* Kinks
* Wear

11. 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 shift fork seal (6) onto the differential carrier housing (4).
2. Install the two-speed rear axle spring (7) onto the two speed rear axle shift fork (5).




3. Apply a thin coat of rear axle lubricant to the shift fork and the two-speed rear axle shift motor lever. Refer to Fluid and Lubricant Recommendations [1][2]Fluid Type Specifications for the rear axle lubricant specifications.





Important: Ensure that the two-speed rear axle shift motor lever engages with the two speed rear axle shift fork (5).


4. Install the two-speed rear axle shift motor (3).

Notice: Refer to Fastener Notice in Cautions and Notices.

5. Install the two-speed rear axle shift motor washers (2) and the nuts (1).

Tighten the two-speed rear axle shift motor nuts (1) to 74 Nm (55 lb ft).




6. Fill the two-speed rear axle motor with lubricant. Refer to Fluid and Lubricant Recommendations [1][2]Fluid Type Specifications for the two-speed rear axle shift motor lubrication specifications.

1. Remove the two-speed rear axle shift motor pipe plug (1) from the two speed rear axle shift motor filler hole.
2. Fill the two-speed rear axle shift motor with lubricant.
3. Ensure that the two speed rear axle shift motor lubricant is level with the bottom of the two-speed rear axle shift motor filler hole.
4. Install the two-speed rear axle shift motor pipe plug (1) into the two-speed rear axle shift motor filler hole.

Tighten the two-speed rear axle shift motor pipe plug (1) to 13 Nm (115 lb ft).

7. Install the air line at the two-speed rear axle shift motor. Refer to Hose and Line Replacement - Nylon and Metal Compression in Air Brakes.
8. Start the engine. Charge the system to the air compressor governor cutout point.
9. Stop the engine.
10. Inspect for air leaks using a soap solution.
11. Verify proper operation of the two-speed rear axle.
12. Remove the wheel blocks.