TM-9-2320-361-34
2-1/2-TON, 6x6, M44A2 SERIES TRUCKS (MULTIFUEL)
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE
MAY 1992
TM-9-2320-361-34 - Page 30 of 764
TM9-2320-361-34
Table 2-1. Mechanical Troubleshooting (Contd).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
I
Step
2.
Step 3.
Step
4.
Step 5.
a.
b.
c.
If rod clevis is not positioned tightly against cover window bearing
screw, fuel shutoff rod may be binding. Verify fuel shutoff rod
travels freely before adjusting clearance between rod clevis and
bearing screw. Failure to verify fuel shutoff rod condition may result
in governor sticking under acceleration and injury to personnel.
If clearance between rod clevis and screw exists, check fuel shutoff rod condition
(TM9-2910-226-34).
If clearance between rod clevis and bearing screw exists, adjust operating cable
(TM9-2910-226-34).
CAUTION
Shutoff rod cover installation will require fuel shutoff rod clevis
operating cable to be placed in the RUN position and governor
linkage in the LOW IDLE position. Incorrect positioning of governor
linkage and/or fuel shutoff cable may result in jamming of governor
linkage in FULL FUEL LOAD position. Engine will run wide open
when started and may cause damage to engine.
If fuel shutoff rod is damaged or defective,replace fuel shutoff assembly
(TM9-2910-226-34).
NOTE
Air entering fuel delivery lines may block fuel flow. Air can enter
line(s) when fitting(s) is loose or line(s) or fitting(s) is defective.
This
is indicated by leaking fuel.
Check operation of fuel injector nozzles. Remove fuel injector nozzles (para. 5-2) and bench
test fuel injector nozzles (TM 9-2815-210-34- 1,-2-1 and, -2-2).
a. If fuel injector nozzles operation is incorrect, clean, adjust, and retest
(TM9-2815-210-34-1 and -2-2).
b. If fuel injector nozzles are internally defective, replace (para. 5-2).
Check fuel delivery lines mounted on, and from, fuel injection pump (TM 9-2320-361-20 and
para. 5-3).
If fuel delivery line(s) is leaking or restricted, tighten line(s) or fitting(s), repair fuel delivery
line(s), or replace fitting(s) (para. 5-3). Bleed air from fuel injection system (TM9-2320-361-20).
Check fuel supply pump (mounted on fuel injection pump) operation (TM9-2910-226-34).
Clean dirt, grease, and paint from fuel delivery line fitting at the final fuel filters which are
mounted in fuel supply pump. Operate in-tank fuel pump and crank engine. Observe the
green port of fuel supply pump.
If no fuel flows from outlet port of fuel supply pump, replace fuel supply pump
(TM9-2910-226-34).
Check fuel density compensator operation (TM9-2910-226-34). Clean dirt, grease, and
paint from fuel delivery line and hydraulic head. Loosen fuel delivery line fitting in
hydraulic head. Operate in-tank fuel pump and crank engine. Observe loose fitting in
hydraulic head.
If no fuel flows from fitting location, replace fuel injection pump (para. 5-4) and repair fuel
injection pump (TM9-2910-226-34).
2-15
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