User manual BENDIX TW-N TWO WAY CONTROL VALVE

[. . . ] All four mounting holes are tapped with a 10-24 thread. The TW-NTM valve is interchangeable with the TW-1TM two-way control valve with respect to vehicle fit and function. Dial plates and attaching screws can be used interchangeably on either the TW-NTM and TW-1TM valves, however other detail components are not interchangeable. OPERATION With the TW-NTM valve in the exhaust position, air at the supply port is prevented from flowing to the delivery port by the lower o-ring on the plunger. (Figure 2) When the lever is moved to the delivery position, (Figure 3) the return spring and air pressure moves the plunger allowing the lower plunger o-ring to slide past the delivery port passage. [. . . ] When working in the engine compartment, the engine should be shut off and the ignition key should be removed. Where circumstances require that the engine be in operation, EXTREME CAUTION should be used to prevent personal injury resulting from contact with moving, rotating, leaking, heated or electrically charged components. OPERATION AND LEAKAGE TESTS 1. With vehicle air pressure at governor cut-out and the engine turned off, place the TW-NTM valve control lever in the air delivery position. Note that the device being controlled promptly responds. Place the control lever in the air exhaust position and note that air is promptly and completely exhausted from the TW-NTM valve. 2 3. Do not attempt to install, remove, disassemble or assemble a component until you have read and thoroughly understand the recommended procedures. Use only the proper tools and observe all precautions pertaining to use of those tools. If the work is being performed on the vehicle's air brake system, or any auxiliary pressurized air systems, make certain to drain the air pressure from all reservoirs before beginning ANY work on the vehicle. 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. Never remove a component or plug unless you are certain all system pressure has been depleted. Use only genuine Bendix ® replacement parts, components and kits. Replacement hardware, tubing, hose, fittings, etc. 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. 2. Using a drift punch, drive the lever pin out and remove the lever. Remove the plunger and plunger return spring. Remove both the large and small diameter o-rings from the plunger. CLEANING AND INSPECTION 1. [. . . ] Connect the air lines to the TW-NTM valve according to the markings made during "Removal". IMPORTANT: Fittings installed in the supply and delivery ports of the TW-NTM valve should not be torqued to greater than 8 ft. Before placing the vehicle in service, perform the "Operation and Leakage Tests". REMOVING 1. Secure the vehicle on a level surface by means other than the brakes. [. . . ]