User manual BENDIX TP-3DC TRACTOR PROTECTION VALVE

[. . . ] Material: Die-cast aluminum Operating pressure: 150 psi maximum Operating temperature: -40° to 200° F Figure 1 shows the TP-3DCTM valve with its port designations, O. E. piece number, and date code identifications. Figure 2 is a sectional view of the TP-3DCTM valve, and Figure 3 presents the TP-3DCTM valve in a partial air brake system schematic. SD-03-3656 1 OPERATION TRACTOR CONTROL (PRIMARY) INITIAL CHARGE DIAPHRAGM TRACTOR CONTROL (SECONDARY) GUIDE STOP LIGHT SWITCH VALVE SPRING TRAILER CONTROL CHECK VALVE CHECK VALVE SPRING TRACTOR SUPPLY AUXILIARY SUPPLY FIGURE 2 - TP-3DCTM TRACTOR PROTECTION VALVE WITH DOUBLE CHECK SECTIONAL VIEW TRAILER SUPPLY As shown in Figure 4, during initial charge air pressure enters the TP-3DCTM tractor supply port (TRAC SUP). In addition to passing through the TP-3DCTM valve to and out the trailer and auxiliary supply lines, supply air moves the plunger, against valve spring pressure, into contact with the guide. [. . . ] Future compounding is prevented by the closed inlet valve. 4 FOOT VALVE TRACTOR CONTROL (PRIMARY) DIAPHRAGM DOUBLE CHECK VALVE TRACTOR CONTROL (SECONDARY) GUIDE VALVE SPRING HAND VALVE STOP LIGHT SWITCH PLUNGER TRAILER CONTROL CHECK VALVE TRACTOR SUPPLY TRAILER SUPPLY AUXILIARY SUPPLY FIGURE 7 - TRACTOR PROTECTION FOOT VALVE TRACTOR CONTROL (PRIMARY) DIAPHRAGM DOUBLE CHECK VALVE TRACTOR CONTROL (SECONDARY) GUIDE VALVE SPRING HAND VALVE STOP LIGHT SWITCH PLUNGER TRAILER CONTROL CHECK VALVE TRACTOR SUPPLY TRAILER SUPPLY AUXILIARY SUPPLY FIGURE 8 - ANTI-COMPOUNDING 5 4. 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-IS® 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. For vehicles with Antilock Traction Control (ATC), the ATC function must be disabled (ATC indicator lamp should be ON) prior to performing any vehicle maintenance where one or more wheels on a drive axle are lifted off the ground and moving. 2. Inspect all air lines connected to the valve for signs of wear or physical damage. Test air line fittings for excessive leakage and tighten or replace as necessary. OPERATIONAL AND LEAKAGE TESTS 1. Block the vehicles wheels and fully charge the air system. Place the trailer supply valve in the emergency position. Disconnect the trailer control line hose coupling. Then make a service application with either the foot valve or the trailer control valve and check for leakage at the hose coupling with a soap solution. Leakage should not exceed a 1" bubble in 5 seconds (100 SCCM). Release the service application and place the trailer supply valve in the normal or run position. [. . . ] Reconnect all air lines to the valve using the identification made during removal. Test all air fittings for excessive leakage and tighten as needed. Also, perform OPERATIONAL AND LEAKAGE TESTS before placing the vehicle back into service. SERVICE CHECKS 1. Visually inspect the valves exterior for cracks, gouges, or other physical damage. [. . . ]