4-15. AIR SYSTEM TROUBLESHOOTING PROCEDURES (CONT).
5. DRAWBAR WILL NOT LOWER.
Tools and Special Tools
Tool Kit, General Mechanic's: Automotive
(Item 50, Appendix J)
Engine OFF, (TM 9-2320-364-10)
Parking brake applied, (TM 9-2320-364-10)
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)
Truck air system OK.
Is drawbar free of damage or
REASON FOR QUESTION
Drawbar frame faulty.
If drawbar binds or is damaged,
Air lines and fittings faulty.
drawbar will not lower.
Air bag control valve faulty.
Check valve and breather faulty.