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DRAWBAR WILL NOT LOWER. (Cont) -725550533
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TM-9-2330-385-14 Palletized Load System Trailer (PLST) Model M1076 Manual
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DRAWBAR RAISES WITHOUT OPERATION. (Cont) -725550535
TM 9-2330-385-14
4-15. AIR SYSTEM TROUBLESHOOTING PROCEDURES (CONT).
6. DRAWBAR RAISES WITHOUT OPERATION.
INITIAL SETUP
Tools and Special Tools
References
Tool Kit, General Mechanic's: Automotive
TM 9-2320-364-10
(Item 50, Appendix J)
Equipment Condition
Engine OFF, (TM 9-2320-364-10)
Personnel Required
Parking brake applied, (TM 9-2320-364-10)
Two
Wheels chocked, (TM 9-2320-364-10)
Charging hose connected to trailer
quick disconnect and truck, (Para 2-9 or 2-11)
Trailer air system charged, (Para 2-22)
NOTE
There are two models of drawbar assist control valves. Model B replaced Model A.
Model A has air lines on top of valve and uses elbow and reducer fittings.
Model B has air lines on back of valve and uses straight adapter fittings.
START
1.
KNOWN INFO
TEST OPTIONS
Truck air system OK.
Visual inspection.
Are lines 2224, 2225, 2226,
2231, 2232 and fittings free
POSSIBLE PROBLEMS
REASON FOR QUESTION
of crimps or blockage?
Air lines and fittings faulty.
If air lines are crimped or
Air bag control valve faulty.
blocked, air pressure will not
Relief valve faulty.
release from air bag.
Repair or replace air
lines and fittings (see
schematic Fig FO-2 or
NO
repair, go to Step 3 of
this Fault.
YES

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