Bendix Commercial Vehicle Systems TP-5 TRACTOR PROTECTION VALVE 5/11 - Manual (Page 4)

4 BW1575 © 2011 Bendix Commercial Vehicle Systems LLC • 5/2011• All rights reserved.
11. Release the foot brake application, disconnect the line
from primary service brake circuit at Bendix ® TP-5 ™
valve delivery port (PCD) and block off the end of the
line from the brake valve. Make a foot brake application
and observe for leakage at the PCD delivery port.
12. Reconnect the primary circuit line and reverse the
procedure with the secondary circuit line (SCD).
Excessive leakage in either (11) or (12) indicates a faulty
double check valve shuttle. Restore the secondary circuit
connection to the TP-5
™ valve.
If the valve does not function as described above, or
leakage is excessive, the valve should be exchanged or
replaced at the nearest authorized Bendix Parts distributor.
If this is not possible the following should prove helpful.
DISASSEMBLY
1. Block the wheels and drain the air brake systems.
2. Remove all air lines and the stop light switch from the
manifold and remove the unit from the vehicle.
3. Remove the four cap nuts, (items 10, 11, 12, and 13)
from the body. Identify the cap nuts to their respective
ports before removing. Remove the o-ring (3 of item 7
and one of item 5). See Figure 4.
4. Remove the double check guides (14) and double check
shuttles (9).
5. Reach into the port marked BLK-SLS with a set of snap
ring pliers and remove the snap ring (15), spring (16),
and valve (2).
6. Remove the two screws which hold the cover (18)
to the body. Remove the two small o-rings (4) and
one large o-ring (3). Remove the quick release valve
diaphragm (1). See Figure 3.
7. Remove the 6-32 pan head screw (17) and remove the
exhaust check valve diaphragm (8).
CLEANING AND INSPECTION
1. Clean all metal parts in mineral spirits and dry them
completely.
2. Inspect all parts for excessive wear or deterioration.
Inspect valve seats for nicks or burrs. Check the valve
spring for cracks or corrosion.
3. Inspect the bores of the valve housing for deep scuffi ng
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-5 ™ valve, lubricate all o-rings,
o-ring grooves, body bores and rubbing surfaces with
Bendix silicone lubricant (Pc. No. 291126) or equivalent.
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.
1. Re-install inlet valve (2), spring (16) and lock ring (15)
in body. See Figure 4.
2. Install shuttle guides (14) and shuttles (9) and their
respective cap nuts (10) and (11).
3. Install the o-rings (5) and (6) on the service line shut-
off plunger (19), and install spring (20), plunger and
corresponding cap nut (12) with o-ring (7).
4. Position the quick release valve diaphragm in the body
(18) and the o-rings (3) and (4) on the cover and install
the cover in its cavity in the body. See Figure 3.
5. Replace the exhaust seal diaphragm (8) in the cover.
TESTING
Test the re-assembled valve per Operating and Leakage
Checks.