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 354 of 481

TM 9-2320-272-10

3-5

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

Table 3-1. Troubleshooting

NOTE

If malfunction corrective action does not correct

malfunction, notify unit maintenance.

ENGINE

1. WHEN STARTER SWITCH IS TURNED TO START, ENGINE FAILS TO CRANK.

Step 1. Check to see if battery switch is off.

If off, turn switch on.

Step 2. Check to see if transmission selector lever is in N (neutral).

If not, place in N (neutral).

WARNING

Do not smoke, have open flames, or make sparks

around battery, especially if cap is off. Battery can

explode and cause injury or death to personnel.

Step 3. Visually check to see if battery cables, terminals, and connections

are loose, broken, or corroded. Check battery for proper water level.

If loose, tighten.

Notify unit maintenance of any damage to batteries, cables, and

terminals.

2. ENGINE CRANKS BUT DOES NOT START.

NOTE

• Do not completely fill fuel tank(s) before checking

visually for leaks in fuel system.

• Whenever fuel tank(s) are completely drained and

then refilled, the fuel system must be primed

(para. 3-8).

Step 1. Check to see if fuel gauge indicates empty.

If empty, fill fuel tank(s).

Step 2. Check to see if emergency engine stop control on instrument panel is

pulled out.

Notify unit maintenance to reset fuel cutoff valve (M939/A1 series

vehicles only).