User manual BENDIX D-2 GOVERNOR

[. . . ] The inlet valve will close and the exhaust will open. With the exhaust open, the air in the unloader line will escape back through the piston, through the exhaust stem and out the exhaust port. Never condemn or adjust the governor pressure settings unless they are checked with an accurate test gauge or a dash gauge that is registering accurately. If the pressure settings of the D-2TM governor are inaccurate or it is necessary that they be changed, the adjustment procedure follows. Note: If the governor cover is marked nonadjustable and the adjusting stem has been sheared off, this is a nonserviceable governor and must be replaced with a new or remanufactured unit. [. . . ] 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. DISASSEMBLY 1. Clean the governor exterior of dirt and grease. If the governor cover is marked nonadjustable and the adjusting screw has been sheared off, this is a nonserviceable governor and must be replaced with a new or remanufactured unit. If the governor has a blue nonmetallic cover, (refer to Figure 2) hold governor with one hand, with the other hand grip cover from the top and pull up with thumb until cover disengages from the governor body. If top cover on governor is made of rubber or clear nonmetallic material unscrew cover until it releases from the adjusting screw (4) of governor. Remove o-ring (20, Figure 2) if present. Note: O-ring (20) is used on Hi-Temp and waterproof governors only. With a pair of retaining ring pliers, remove the spring assembly retaining ring (1) and save. Pull the adjusting screw (4) and spring assembly out of the governor body (2). Note: Disassembly of the spring assembly normally is not required. (Reuse and do not wash the assembly because lubrication may be removed. ) If Disassembly of the spring assembly is necessary, the following instructions apply; otherwise, proceed to Step 6. Remove the lock nut (3), then the hex-shaped upper spring seat (16) from the adjusting screw (4). [. . . ] Tighten until cover bottoms on governor body. Note: O-ring (20) is used only on Hi-Temp and waterproof governors. If cover provided in kit is blue nonmetallic place cover over one edge of top of governor; with index finger catch knob on top of cover and pull until cover snaps into place. Note: Nonmetallic cover should be at room temperature for ease of assembly. [. . . ]