TM-9-2320-272-10

TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)

TECHNICAL MANUAL; OPERATOR'S MANUAL

SEPTEMBER 2004

CHANGE 2

TM-9-2320-272-10 - Page 361 of 481

TM 9-2320-272-10

3-12

Change 2

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

Table 3-1. Troubleshooting (Contd).

DUMP BODY HOIST ASSEMBLY

28. HOIST DOES NOT LIFT DUMP BODY.

Step 1. Check to see if power takeoff is engaged.

If not, engage power takeoff.

Step 2. Check to see if dump body control lever is pushed back to raise

position.

If not, push lever back to raise position.

Step 3. Check level of hydraulic oil in reservoir (para 2-25).

If low, add oil to proper level (para. 2-10).

Step 4. Check for hydraulic oil leaks.

Tighten loose connections. If leaks continue, notify unit maintenance.

29. BODY RAISES TO FULL DUMP BUT DOES NOT POWER DOWN.

Step 1. Check to see if support braces are in place.

If in place, lower.

Step 2. Check to see if dump body control lever is pulled full forward to

lower position.

If not, pull lever full forward to lower position.

30. HYDRAULIC PUMP NOISY.

Check level of hydraulic oil in reservoir (para. 2-25).

If low, add oil to proper level (para. 2-10).

31. TAILGATE DOES NOT OPEN.

Step 1. Check to see if tailgate control rod is pulled forward and down to

unlock tailgate.

If not, pull tailgate control rod forward and down to unlock tailgate.

Step 2. Check to see if tailgate chains are restricting tailgate from opening.

If restricting opening of tailgate, reposition tailgate chains.