ROCKER ARM AS 4P5259 - Caterpillar

The valve shown removed is the secondary brake valve. The retarder valve is removed the same way.
To prevent possible personal injury, make sure all of the pressure in the air system is released before any air lines are disconnected.
2. Release the air pressure in the system.3. Remove setscrew (2) from the adapter on secondary brake valve (4). 4. Remove two bolts (8) that hold the brake valve to the cab.5. Pull secondary brake valve (4) off the shaft assembly.6. Disconnect air lines (6) and (7) from secondary brake valve (4), and remove the valve from the machine. The following steps are for installation of the retarder valve and secondary brake valve. Air line (6) is from the parking brake control valve. Air line (7) is from the brake release air reservoir. Air line (3) to retarder valve (1) is from the brake air check valve. Air line (5) to the retarder valve is from the service brake valve.7. Connect air lines (6) and (7) to secondary brake valve (4).8. Put brake valve in position on the shaft, and install two bolts (8).9. Install setscrew (2) to hold the adapter on the brake valve to the shaft.10. Install the cover on the front of the cab.Disassemble Retarder Valve Or Secondary Brake Valve
Start By:a. remove retarder valve or secondary brake valve The valve that is shown disassembled is the retarder valve. The secondary brake valve is disassembled the same way.1. Remove setscrew (1) from the adapter. Remove adapter (2) from the cover. Remove the O-ring seal from the cover. 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). Before the adjusting ring is removed, make a note of 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 too much 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 Or 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). Put the adjusting ring in approximately the same position it was when removed.4. Install adjusting ring (9) in cover (10). Make sure the lockring tang on the lockring is in