Usage:
Start By:
a. remove cab front cover
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To prevent possible personal injury, make sure all of the pressure in the air system is released before any air lines are disconnected. |
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NOTE: The valve that is shown removed is the retarder valve. The secondary brake valve is removed the same way.
1. Release the air pressure in the system.
2. Use an Allen wrench to remove the setscrew that holds the retarder valve adapter to the shaft.
3. Remove bolts (3) and (4) from the steering column that hold the retarder valve to the column.
4. Put identification marks on the air lines for correct installation. Pull the valve out, and disconnect air lines (2) from the retarder valve. Remove retarder valve (1).
NOTE: The following steps are for installation of the retarder valve and secondary brake valve.
5. Connect air lines (2) to the retarder valve. Put retarder valve (1) in position.
6. Install bolts (3) and (4) that hold the retarder valve to the steering column.
7. Install the setscrew that holds the retarder valve adapter to the shaft.
End By:
a. install cab front cover
Disassemble Retarder Valve And Secondary Brake Valve
Start By:
a. remove retarder valve or secondary brake valve
NOTE: The valve that is shown disassembled is the retarder valve. The secondary brake valve is disassembled the same way.
NOTE: The secondary brake valve does not have the O-ring seal.
1. Remove setscrew (1) from the adapter. Remove adapter (2) from the cover. Remove the O-ring seal from the cover.
NOTE: The secondary brake valve does not have the O-ring seal.
2. Turn the valve over, and remove screws (3) and (4) that hold the cover to the body.
3. Remove cover (5) and cam and follower (6).
NOTE: Before the adjusting ring is removed, note the position of the adjusting ring in the cover, and install it in approximately the same position.
4. Remove lockring (7) and adjusting ring (8) from the cover.
5. Separate the cam and follower. Inspect the lobes on the cam and follower for excessive wear. Make a replacement of the cam and follower if needed.
6. Remove spring (9), piston (10) and spring (12) from body (13). Remove O-ring seal (11) from the piston.
7. Remove the screws that hold valve assembly (14) in place. Remove valve assembly (14). Remove O-ring seal (15) from the valve assembly.
Assemble Retarder Valve And Secondary Brake Valve
1. Inspect all the O-ring seals, and make replacements if needed. Make sure all the parts are clean.
2. Install O-ring seal (2) on valve assembly (1). Put valve assembly (1) in position in body (3). Install the two screws that hold the valve assembly in the body.
3. Install spring (7), O-ring seal (6), piston (5) and spring (4) in body (3).
4. Install adjusting ring (9) in cover (10).
NOTE: Put the adjusting ring in approximately the same position it was when removed.
5. Install lockring (8).
NOTE: Make sure the locking tang on the lockring is in alignment with the groove (slot) in cover (10). Make sure the vertical tangs on the lockring are in alignment with the inside diameter grooves (slot) in the adjusting ring.
6. Put 5P960 Multipurpose Grease on the lobes of follower (11) and cam (12).
7. Put the cam and follower together. Install the gasket between the body and the cover. Install cam and follower (14) and cover (13).
8. Install O-ring seal (15).
NOTE: The secondary brake valve does not have the O-ring seal.
9. Install adapter (16) on the cover. Make an alignment of the hole in the follower with the hole in the adapter.
10. Install setscrew (17) in the adapter.
11. After installation of the retarder valve or the secondary brake valve, adjust the valves. See Testing And Adjusting, Form SENR5645, for the proper procedure.
End By:
a. install retarder valve or secondary brake valve