DRAWBAR RAISES WITHOUT OPERATION.

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

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

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

repair, go to Step 3 of

this Fault.

YES

4-244