TM-9-2320-361-24-1

2-1/2 TON, 6X6, M44A2 SERIES TRUCKS

TECHNICAL MANUAL; FIELD AND SUSTAINMENT MAINTENANCE PART 1 OF 2

AUGUST 2006

TM-9-2320-361-24-1 - Page 99 of 1176

TM 9-2320-361-24-1

0006 00

0006 00-3

MECHANICAL SYSTEMS TROUBLESHOOTING - UNIT (Contd)

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

2. ENGINE CRANKS BUT

WILL NOT START

(Contd)

4. Check in-tank pump pressure

(WP 0061 00).

5. Turn accessory switch to ON

position and check pressure at

secondary and final fuel filters

(WP 0064 00).

6. Check fuel tank pickup tube for

restrictions (WP 0061 00).

7. Check fuel pump for proper fuel

pressure (WP 0061 00).

8. Check fuel shutoff for proper

adjustment (WP 0071 00).

If pressure is below 4 psi (27.58 kPa)

replace in-tank fuel pump

(WP 0061 00).

1. If pressure is below 2 psi

(14.0 kPa), remove and replace

primary fuel filter (WP 0063 00),

and recheck pressure at

secondary and final fuel filters.

If pressure is still below 2 psi

(14.0 kPa), replace secondary and

final fuel filters (WP 0064 00).

2. If filters are clean and pressure is

still below 2 psi (14.0 kPa) at

secondary and final fuel filter,

inspect fuel lines for kinks, bends,

breaks, loose connections,

restrictions, and leaks. Repair fuel

lines if damaged.

Remove restrictions from fuel tank

pickup tube (WP 0061 00).

1. If fuel pressure gauge reads no

pressure, inspect electrical

connections.

2. If electrical connections are

properly connected, replace fuel

pump (WP 0061 00).

Adjust fuel shutoff for proper

operating conditions (WP 0071 00).

3. STARTER CRANKS

ENGINE SLOWLY

1. Check starting system circuits

(WP 0012 00, table 2,

malfunction 2).

2. In cold weather, make sure proper

engine oil is being used and/or

replace oil (WP 0020 00).

3. Check water pump and belt-driven

accessories. Remove all belts

(WP 0084 00 and WP 0182 00).

Manually turn drive pulley of each

accessory and water pump

If starting system circuits are

damaged, repair or replace.

Use proper engine oil for climate

conditions.

1. If water pump drive pulley will

not turn, replace water pump

(WP 0082 00).

2. If any drive pulley accessory will

not turn, replace accessory

(WP 0085 00, and WP 0180 00).

4. ENGINE STOPS

DURING NORMAL

OPERATION

1. Check air cleaner for restrictions

(WP 0006 00, table 1,

malfunction 1).

2. Check fuel system for

contamination and restrictions

(WP 0006 00, table 1,

malfunction 2).

3. Check for restrictions in exhaust

system. Ensure exhaust system is

not bent, restricted, or damaged.

Remove restrictions from air cleaner.

If water or contamination is present,

remove fuel tank (WP 0060 00).

If exhaust system is damaged or

restricted, replace damaged parts

(WP 0073 00). (For M50A3 series

vehicles, refer to WP 0074 00).

Table 1. Engine Troubleshooting Procedures (Contd).