TB-9-3950-253-13-P

PALLETIZED LOAD SYSTEM TRUCK, M1075 and M1075A1 (PLS) AND HEAVY EXPANDED MOBILITY TACTICAL TRUCK, M1120, M1120A2, AND M1120A4 (HEMTT), ENHANCED CONTAINER HANDLING UNIT (E-CHU)

TECHNICAL BULLETIN; OPERATOR AND FIELD MAINTENANCE, INSTALLATION INSTRUCTIONS, AND REPAIR PARTS AND SPECIAL TOOLS LIST

JULY 2009

TB-9-3950-253-13-P - Page 212 of 704

TB 9-3950-253-13&P

Change 1

0019-32

0019

PNEUMATIC SYSTEM - CONTINUED

1. NO STOWAGE LATCH FUNCTION – CONTINUED.

Step 13.

Disconnect test gauge from input hose, and connect input hose to valve actuator.

Step 14.

Disconnect air hose from stowage latch actuator and connect test gauge hose to air hose.

Step 15.

Set battery disconnect switch to ON position and start engine.

Step 16.

Press RETRIEVE button and check air output pressure from solenoid valve.

a.

If output pressure is less than 130 psi, replace solenoid valve (WP 0026).

b.

If output pressure equals 130 psi, replace stowage latch actuator (WP 0022).

2. LHS HOOK NOT ALIGNED WITH LIFT FRAME BAIL BAR.

NOTE

• Inconsistent air bag pressure may cause LHS hook to become off center with vehicle frame. Draining and

refilling air bag will realign hook.

• For the HEMTT family, air bags are found only on the M1120A4.

Step 1.

Visually inspect LHS hook in relation to lift frame bail bar. If LHS hook is not aligned with center

of lift frame bail bar, drain and refill air bag system.

a.

Completely drain vehicle air system (PLS: TM 9-2320-364-10, HEMTT: TM 9-2320-345-

10).

c.

Start engine and allow vehicle air system to fully charge (PLS: TM 9-2320-364-10, HEMTT:

TM 9-2320-345-10).

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

0.