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 129 of 704

0014-3

TB 9-3950-253-13&P

0014

CONTROL PANEL – CONTINUED

3. DOWN BUTTON INOPERATIVE.

Step 1.

Verify that hydraulic oil level is within normal range (PLS: TM 9-2320-364-14&P, HEMTT: TM 9-

2320-326-14&P).

Add hydraulic oil to normal operating level (PLS: TM 9-2320-364-14&P, HEMTT: TM 9-2320-

326-14&P).

Step 2.

Verify that engine is started and running at idle speed (PLS: TM 9-2320-364-14&P, HEMTT: TM

9-2320-326-14&P).

Start engine and run at idle speed (PLS: TM 9-2320-364-14&P, HEMTT: TM 9-2320-326-14&P).

Step 3.

Verify that MODE switch is set to AUTO position (PLS: TM 9-2320-364-14&P, HEMTT: TM 9-

2320-326-14&P).

Set MODE switch to AUTO position (PLS: TM 9-2320-364-14&P, HEMTT: TM 9-2320-326-

14&P).

Step 4.

Verify that stowage control panel AUTO/OFF/MAN switch is set to AUTO position (WP 0004).

Set stowage control panel AUTO/OFF/MAN switch to AUTO position (WP 0004).

Step 5.

HEMTT only: verify that PTO switch is set to ON position (TM 9-2320-326-14&P).

Set PTO switch to ON position (TM 9-2320-326-14&P).

Step 6.

Verify that transport locks are in stowed position (WP 0008) and sensor lights are on.

Stow transport locks (WP 0008).

Step 7.

Verify that rear twistlocks are in stowed position (WP 0008) and sensor lights are on.

Stow rear twistlocks (WP 0008).

Step 8.

Verify that lift frame is in stowed or retrieved position (WP 0008) and both guide sensor lights

are on.

If leaks are found, notify Field Maintenance.

Step 9.

Inspect stowage assembly hydraulic hoses and fittings for leaks or damage (WP 0016).

If leaks are found, notify Field Maintenance.

Step 10.

If DOWN button is still inoperative, notify Field Maintenance.

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

0.