User manual BENDIX TP-2 TRACTOR PROTECTION VALVE

[. . . ] Consequently a TP-2TM valve should never be replaced by a TP-3TM valve unless the on-off control valve in the cab is replaced with either a PP-3TM or PP-7TM trailer supply valve. OPERATION - NORMAL POSITION With air pressure at approximately 50 psi at the control port, the diaphragm and plunger assembly is depressed and the plunger contacts the service and exhaust valve surface sealing the exhaust passage through the center of the plunger. Continued travel of the plunger moves the service valve off its seat, opening the service passage from the 1 SD-03-3651 CONTROL VALVE BRAKE VALVE TRAILER SERVICE LINE TRAILER EMERGENCY LINE TRACTOR PROTECTION VALVE NO. 2 RESERVOIR COMPRESSOR FIGURE 2 - TRACTOR PROTECTION SYSTEM tractor service port to the trailer service port. The stem of the service and exhaust valve contacts the emergency valve, sealing the exhaust passage. [. . . ] Remove exhaust plunger spring (15) from body. Inspect bores in valve body to be sure they are not damaged or out of round. Clean body, control cap and cover. CLEANING AND INSPECTION 1. Clean all metal parts in mineral spirits and dry them completely. Inspect all parts for excessive wear or deterioration. Check the valve spring for cracks or corrosion. Inspect the bores of the valve housing for deep scuffing or gouges. Replace all parts that were discarded and any parts not found to be serviceable during inspection, using only genuine Bendix replacement parts. ASSEMBLY Before assembling the TP-2TM valve, lubricate all o-rings, o-ring grooves, body bores and rubbing surfaces with Bendix silicone lubricant (Pc. NOTE: When using pipe thread sealant during assembly and installation, take particular care to prevent the sealant from entering the valve itself. Apply the sealant beginning with the second thread back from the end. Install o-ring (16) in groove in the stem of the exhaust valve plunger and diaphragm assembly (14). Install exhaust plunger spring (15) in valve body and install exhaust plunger and diaphragm assembly (14). IMPORTANT: Both sides of diaphragm and clamping surfaces of body and control cap must be free of grease. Plunger should be a neat sliding fit in bore. Position control cap (13) and cap nut (12). Position control cap to desired port angle (as marked during disassembly). Install a short (4-6") 1/4" pipe nipple in control port of cap. Apply pressure firmly on cap, holding in position with pipe nipple and firmly tighten cap nut to approximately 50 ft. It is important that the cap not be allowed to turn while tightening the cap nut. Place valve in vise with control cap down. Install o-ring (10) in valve body (smaller of two o-rings). REMOVING AND INSTALLING REMOVING 1. [. . . ] 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. [. . . ]