DRAWBAR WILL NOT RAISE OR REMAIN RAISED.

TM 9-2330-385-14

4-15. AIR SYSTEM TROUBLESHOOTING PROCEDURES (CONT).

4. DRAWBAR WILL NOT RAISE OR REMAIN RAISED.

INITIAL SETUP

Tools and Special Tools

References

Tool Kit, General Mechanic's: Automotive

TM 9-2320-364-10

(Item 50, Appendix J)

Equipment Condition

Pressure Test Kit (Item 34, Appendix J)

Engine OFF, (TM 9-2320-364-10)

Parking brake applied, (TM 9-2320-364-10)

Materials/Parts

Wheels chocked, (TM 9-2320-364-10)

Solution, Soap (Item 21, Appendix E)

Charging hose connected to trailer

quick disconnect and truck, (Para 2-9)

Personnel Required

Trailer air system charged, (Para 2-22)

Two

NOTE

Soap and water solution will be used to visually check for leaks.

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

KNOWN INFO

TEST OPTIONS

Visual inspection.

Truck air system OK.

Is drawbar free of damage or

binding?

POSSIBLE PROBLEMS

REASON FOR QUESTION

Drawbar frame faulty.

If drawbar binds or is damaged,

Air lines and fittings faulty.

drawbar will not raise.

Quick disconnect check

valve faulty.

Air reservoir 1 check

valve faulty.

Air bag control valve faulty.

Inversion valve faulty.

Safety valve faulty.

Notify DS

Maintenance.

YES

4-226