BENDIX SD-03-3652 User Manual

Bendix® TP-3® Tractor Protection Valve
TRACTOR EMERGENCY PORT
TRACTOR SERVICE PORT
TRAILER EMERGENCY PORT
TRAILER SERVICE PORT
VALVE SPRING(6)
DIAPHRAGM
SEAT(9)
DIAPHRAGM(5)
SD-03-3652
O-RING(13)
PLUNGER(11)
INLET VALVE(4)
VALVE RETAINER(10)
RETAINING RING(2)
O-RING(12)
SEAT O-RING(7)
EXTERIOR VIEW
FIGURE 1 - BENDIX® TP-3® TRACTOR PROTECTION VALVE
DESCRIPTION
The Bendix® TP-3® Tractor Protection Valve is used in combination with the Bendix® PP-3™ Trailer Supply Valve on pre-121 tractors, and the Bendix V alve, or the Bendix
®
MV-3® V alve, on post-121 tractors. It contains a passage for trailer supply air and a service line shut off valve. It is normally mounted behind the cab, with the delivery line from the trailer supply valve connected into the tractor emergency port and a delivery line from the brake valve connected to the tractor service port. The trailer supply and service hoses are mounted in their respective ports in the TP-3 valve. See Figure 2.
OPERATION
Air from the trailer supply valve passes through the emergency ports of the TP-3 valve to supply the trailer air system and simultaneously exerts pressure on the end of the plunger(1 1). The TP-3 valve requires approximately 45 psi to open the inlet valve. Whenever the pressure from the trailer supply valve drops below 45 psi, the TP-3 valve will close the service line shut-off valve.
®
PP-7™ Trailer Supply
WASHER(8)
CAP SCREW(3)
CROSS SECTION
RETAINING RING(1)
PREVENTIVE MAINTENANCE
Important: Review the Bendix Warranty Policy before
performing any intrusive maintenance procedures. A warranty may be voided if intrusive maintenance is performed during the warranty period.
No two vehicles operate under identical conditions; as a result, maintenance intervals may vary. Experience is a valuable guide in determining the best maintenance interval for air brake system components. At a minimum, the Bendix TP-3 valve should be inspected every 6 months or 1500 operating hours, whichever comes fi rst, for proper operation. Should the TP-3 valve not meet the elements of the operational tests noted in this document, further investigation and service of the valve may be required.
1
DOUBLE
CHECK
VALVE
BRAKE
VALVE
BENDIX® MV-3®
CONTROL VALVE
BENDIX® TP-3®
TRACTOR
PROTECTION
VALVE
TRAILER
EMERGENCY LINE
TRAILER
SERVICE LINE
AIR
DRYER
COMPRESSOR
FIGURE 2 - SYSTEM SCHEMATIC
FRONT
RESERVOIR
OPERATING AND LEAKAGE CHECKS
1. Block and/or hold the vehicle by a means other than the air brakes during these tests. Place the trailer supply valve in the emergency position and disconnect the trailer supply and service couplings.
2. With the tractor reservoirs charged to at least 100 psi, make and hold a full service brake application. Leakage at either tractor hose coupling should not exceed a 1 inch bubble in fi ve seconds (100 SCCM).
3. Connect the trailer supply, or emergency line, hose coupling and place the trailer supply valve in the “run” position. Leakage at the “service” coupling should not exceed a 1 inch bubble in fi ve seconds (100 SCCM).
4. Connect the service coupling and make and hold a full service brake applicat ion: Leakage at the diaphragm end of the Bendi x® TP-3® Valve shall not exceed a 1 inch bubble in three seconds (175 SCCM).
NOTE: If the TP-3 V alve does not function as described, or if leakage is excessive, it is recommended that it be replaced or repaired using genuine Bendix service replacement parts.
REAR
RESERVOIR
REMOVING
Remove the trailer hose assemblies from the TP-3 valve. Disconnect tractor service and supply lines and remove the TP-3 valve.
INSTALLING
When installing the TP-3 valve, refer to Figure 2, and the following explanation, for proper connections.
1. The delivery line from the Bendix® MV-3® Dash Control V alve is connected to the tractor emergency port of the TP-3 valve.
2. The delivery line from the brake valve (or double check valve) is connected to the tractor service port of the TP-3 valve.
3. Trailer hose assemblies are installed in the trailer emergency and trailer service ports of the TP-3 valve.
2
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