Bendix Commercial Vehicle Systems TP-3 TRACTOR PROTECTION VALVE - Manual (Page 2)

2
FIGURE 2
TRAILER
SERVICE LINE
TRAILER
EMERGENCY
LINE TP-3 ™
TRACTOR
PROTECTION
VALVE
NO. 2
RESERVOIR
BRAKE
VALVE
NO. 1
RESERVOIR
DOUBLE
CHECK
COMPRESSOR
PP-3 ™
CONTROL
VALVE
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 TP-3
™
valve should be inspected every 6 months or 1500 operating
hours, whichever comes first, 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.
OPERATING AND LEAKAGE CHECKS
1. Block and/or hold the vehicle by a means other than air
brakes during these tests. Place the trailer supply valve
in the emergency position and disconnect the trailer
supply and service couplings.
2. With 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"
bubble in 5 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" bubble in 5 seconds (100 SCCM).
4. Connect the service coupling and make and hold a full
service brake application: Leakage at the diaphragm
end of the TP-3
™ valve shall not exceed a 1" bubble in 3
seconds (175 SCCM).
NOTE: If the TP-3 ™ valve does not function as described or
if leakage is excessive, it is recommended that it
be returned to the nearest authorized Bendix parts
outlet for factory rebuilt valve. If this is not possible,
the valve should be repaired using genuine Bendix
parts, in which case the following should prove
helpful.
REMOVING
Remove 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 for proper
connections along with the following explanation.
1. The delivery line from the trailer supply valve (PP-3 ™ or
PP-7 ™ ) 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.
TC-2 ™
CONTROL VALVE