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).


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