User manual BENDIX VM-3 FIREWALL MANIFOLD

[. . . ] The PR-4TM pressure protection valve receives supply air from the front (secondary) supply port and supplies protected air to three ports, one on the engine side and two on the cab side. The PR-4TM valve will deliver air to these ports only after the front supply system has built up to at least 60 psi. Supply air for the trailer control hand valve is taken from a port inside the cab supplied from the rear (primary) air supply. [. . . ] Following the vehicle manufacturer's recommended procedures, deactivate the electrical system in a manner that safely removes all electrical power from the vehicle. Never connect or disconnect a hose or line containing pressure; it may whip. Never remove a component or plug unless you are certain all system pressure has been depleted. SD-03-3410 1 NO. 3 NO. 9 NO. 2 NO. 4 NO. 1 9 NO. 6 NO. 5 5 1 2 3 4 6 7 8 NO. 8 NO. 7 10 11 12 ENGINE SIDE FIGURE 1 Port No. Delivers air from double check valve area to spring brake relay valve (R-8). Suggested use - manifold connection to differential lockout mechanism. Suggested use - deliver air from trailer supply valve (such as BW PP-7) to trailer. Suggested use - deliver air from park control valve to spring brake control valve (SR-1TM valve). Suggested use - supplies secondary reservoir air to the balance port of the SR-1 spring brake control valve. 5 5 6 7 8 6 Trl. Supplies protected air from PR-4TM valve to any accessory control in cab. Supplies protected air from PR-4TM valve to any accessory control in cab. Supplies air from double check valve to trailer supply valve (tractor protection). Receives air from delivery of park control valve to deliver to SR-1TM spring brake control valve. Receives air from trailer supply valve (tractor protection) to supply trailer. must be of equivalent size, type and strength as original equipment and be designed specifically for such applications and systems. Components with stripped threads or damaged parts should be replaced rather than repaired. Do not attempt repairs requiring machining or welding unless specifically stated and approved by the vehicle and component manufacturer. Prior to returning the vehicle to service, make certain all components and systems are restored to their proper operating condition. SERVICE CHECKS OPERATING AND LEAKAGE CHECKS 1. Stop engine, drain the front brake reservoir and disconnect tube fitting at port No. [. . . ] Should the VM-3TM manifold not meet the elements of the operational tests noted in this document, further investigation and service of the valve may be required. 3 DISASSEMBLY Block the wheels and drain the air brake system. (Caution - the cover is spring loaded. ) Remove the PR-4TM valve piston assembly. Do not attempt to remove the retaining ring and stem from the piston. ASSEMBLY Before assembly, lubricate all o-rings, bores and mating surfaces with BW-650M lubricant pc. [. . . ]