Air Brake Chamber Clevis Replacement Rockwell

1. Block the wheels.
2. Cage the rear air brake chambers. Refer to Caging the Rear Air Brake Chamber .
3. Drain all air reservoirs. Refer to Draining Reservoirs in Air Brakes.
4. Mark the position of the slack adjuster to the camshaft by drawing a straight line on both parts.



5. Remove the front air brake chamber clevis pin retainers.
6. Remove the front air brake chamber clevis pins.



7. Remove the rear air brake chamber clevis pin retainers.
8. Remove the rear air brake chamber clevis pins.
9. Fully release the air brake automatic slack adjuster.
10. Disengage the pawl with a screwdriver.
11. Turn the slack adjuster adjusting nut until the slack adjuster is free from the air brake chamber clevis.
12. Release the pawl so that the pawl snaps into engagement.



13. Loosen the jam nut.
14. Remove the air brake chamber clevis and the jam nut.
15. Inspect the service brake chamber pushrod for damage.

Overhaul or replace the service brake chamber assembly if damaged.

1. Loosely assemble the jam nut and the air brake chamber clevis to the service brake chamber pushrod.
2. Adjust the air brake chamber clevis. Turn the air brake chamber clevis clockwise in order to decrease the distance. Turn the clevis counterclockwise in order to increase the distance.



3. Adjust the front air brake chamber clevis to 72.0 mm (2.83 in) from the mounting surface of the service brake chamber to the center of the air brake chamber clevis pin mounting hole.




Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

4. Adjust the rear air brake chamber clevis to 68.5 mm (2.69 in) from the mounting surface of the spring brake chamber to the center of the air brake chamber clevis pin mounting hole.

Tighten

•	Tighten the front air brake chamber clevis jam nut (type 16 air brake chamber) to 45 N·m (33 lb ft).

•	Tighten the front air brake chamber clevis jam nut (types 20 and 24 air brake chamber) to 78 N·m (57 lb ft).

•	Tighten the rear air brake chamber clevis jam nut to 77 N·m (56 lb ft).




5. Fully release the slack adjuster.
6. Disengage the pawl with a screwdriver.



7. Turn the slack adjuster adjusting nut until the slack adjuster arm is properly aligned with the holes in the air brake chamber clevis.
8. Release the pawl so that the pawl snaps into engagement.



9. Install the front air brake chamber clevis pins.
10. Install the new front air brake chamber clevis pin retainers.



11. Install the rear air brake chamber clevis pins.
12. Install the new rear air brake chamber clevis pin retainers.
13. Adjust the brakes. Refer to Air Drum Brake Adjustment .
14. Start the engine.
15. Charge the system to the air compressor governor valve cut-out point.
16. Stop the engine.
17. Uncage the rear air brake chamber assemblies. Refer to Caging the Rear Air Brake Chamber .
18. Check for proper brake operation.
19. Set the parking brake.
20. Remove the wheel blocks.

Air Brake Chamber Clevis Replacement Eaton

1. Block the wheels.
2. Cage the rear air brake chambers. Refer to Caging the Rear Air Brake Chamber .
3. Drain all air reservoirs. Refer to Draining Reservoirs in Air Brakes.



4. Remove the air brake chamber clevis pin cotter pin.
5. Remove the air brake chamber clevis pin.
6. Fully release the air brake automatic slack adjuster. Turn the air brake automatic slack adjuster counterclockwise until the slack adjuster arm is free from the air brake chamber clevis.



7. Loosen the jam nut.
8. Remove the air brake chamber clevis and the jam nut.
9. Inspect the service brake chamber pushrod for damage.

Overhaul or replace the service brake chamber if damage exists.

1. Loosely assemble the jam nut and the air brake chamber clevis to the service brake chamber pushrod.
2. Adjust the air brake chamber clevis by turning the air brake chamber clevis clockwise in order to decrease the distance.

Adjust the air brake chamber clevis. Turn the air brake chamber clevis counterclockwise.




3. Measure the front air brake chamber clevis to 72.0 mm (2.83 in) from the mounting surface of the service brake chamber to the center of the air brake chamber clevis pin mounting hole.



4. Measure the rear air brake chamber clevis to 68.5 mm (2.69 in) from the mounting surface of the spring brake chamber to the center of the air brake chamber clevis pin mounting hole.




Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

5. Install the front air brake chamber clevis jam nut.

Tighten

•	Tighten the front air brake chamber clevis jam nut (type 16 air brake chamber) to 45 N·m (33 lb ft).

•	Tighten the front air brake chamber clevis jam nut (types 20 and 24 air brake chamber) to 78 N·m (57 lb ft).

•	Tighten the rear air brake chamber clevis jam nut to 77 N·m (56 lb ft).

6. Rotate the slack adjuster adjusting hex clockwise until the slack adjuster arm hole aligns with the air brake chamber clevis hole.



7. Install the air brake chamber clevis pin.
8. Install the air brake chamber clevis pin cotter pin.
9. Adjust the brakes. Refer to Air Drum Brake Adjustment .
10. Start the engine.
11. Charge the system to the air compressor governor valve cut-out point.
12. Stop the engine.
13. Uncage the rear air brake chambers. Refer to Caging the Rear Air Brake Chamber .
14. Check for proper brake operation.
15. Set the parking brake.
16. Remove the wheel blocks.