User manual BENDIX TC-7 TRAILER CONTROL BRAKE VALVE

[. . . ] Intermediate positions should deliver proportional intermediate pressures. Upon release, the gauge should immediately register zero. LEAKAGE TEST Locate the exhaust port or exhaust line and apply a soap solution. (It is common practice to connect a line from the valve exhaust port to a location remote from the immediate driver's area. ) With the valve in the released position, exhaust leakage should not exceed a 1" bubble in 5 seconds (100 sccm). [. . . ] NOTE: A spanner wrench can be used to rotate the adjusting ring, but if such a wrench is not available, the adjusting ring can be returned with a small screwdriver inserted in one of the inner notches of the ring. Remove adjusting ring adapter(4), cam follower(5), sealing ring(15) and friction washer(17). Discard sealing ring(15) and o-rings (18 & 19). NOTE: Note whether friction washer is installed with ribs against or away from sealing ring. Must be installed same-way during assembly. Remove and retain cam(7) and graduating spring(8). Remove and discard o-ring(10) from piston(9). Remove and discard piston return spring(11). Using an 11/16" deep well socket wrench, remove and discard inlet and exhaust valve assembly(12) and o-ring(13). ASSEMBLY Prior to assembly, wash parts retained during disassembly in mineral spirits and dry thoroughly. Using Bendix lubricant 291126 or a silicone lubricant equivalent to Dow Corning 55-M, lubricate the body bores, cam, cam follower and all o-rings and o-ring grooves. NOTE: Do not lubricate sealing ring, friction washer or cam follower serrations. Install o-ring(13) on inlet and exhaust valve assembly(12) and using an 11/16" deep well socket wrench, install inlet and exhaust valve assembly(12). Install o-ring(10) on piston(9) and install piston(9) in body(1). Install graduating spring(8) in body(1). Install cam(7) in body(1) with flat side toward graduating spring. Index cam "ears" to corresponding slots in body. 6. Install rubber sealing ring(15) on cam follower(5). Install the friction washer(17) on cam follower(5) in same manner as noted in Step 4 of Disassembly. NOTE: Stop "ear" on cam follower will not permit improper assembly of cam follower; however, make certain that the positioning "ear" of the friction washer fits in the wide slot in the body. Install o-ring(18) in adjusting ring adapter(4) and install o-ring(19) in adjusting ring(6). Install adjusting ring(6) in adapter(4) until adjusting ring is flush with the underside of the adapter. [. . . ] If the vehicle is equipped with an AD-ISTM air dryer system or a dryer reservoir module, be sure to drain the purge reservoir. Following the vehicle manufacturer's recommended procedures, deactivate the electrical system in a manner that safely removes all electrical power from the vehicle. Never exceed manufacturer's recommended pressures. Never connect or disconnect a hose or line containing pressure; it may whip. [. . . ]