TM 9 - 2 3 2 0 - 2 1 1 - 2 0
Table
2-3.
Troubleshooting--Vehicle--Continued
Item
Probable Cause
Malfunction
No.
Corrective Action
CLUTCH
24 Clutch slips or drags.
Insufficient free-pedal travel (less
Adjust pedal linkage (para 2-55, 2-
than one inch).
61).
25 Clutch chatters
Loose, broken, or defective clutch
Inspect transmission attaching bolt,
mounting bolts, insulators, or
propeller shafts, universal joints
and bearings for improper or loose
brackets.
connections. Tighten as required.
EXHAUST
SYSTEM
26 Defective exhaust system.
a. Defective or restricted muffler or
exhaust pipe.
pipe (para 2-103).
b. Loose or defective manifold and
Tighten or replace flange clamps as
required.
exhaust pipe flange clamps.
COOLING SYSTEM
a. Lack of coolant
27 Engine overheats; temperature
R e p l e n i s h w a t e r i n radiator. Add
antifreeze if necessary.
r i s e s over 200 F.
I n s p e c t c o o l i n g s y s t e m for leaks.
b. Coolant leaks
Tighten or replace hose as
necessary.
Replace pump (para 2-118 and 2-
c. Faulty water pump
118I).
Replace radiator (para 2-110).
d. Leaky radiator core
Adjust belts (para 2-111 and 2-112).
e. Loose fan belt
Remove and test thermostat (para 2-
f. Defective thermostat
and
2-115);
replace
if
necessary.
g. Clogged radiator
Clean and flush radiator (para 2-
radiator
Check caps and replace if necessary.
h. D e f e c t i v e o r i m p r o p e r
pressure caps.
Remove bugs, leaves, and ac-
free air
h. Obstruction
preventing
cumulated dirt from radiator, using
flow through radiator.
high-pressure air or water.
Check condition of hoses and replace
i. Inlet or outlet hose collapsed.
if necessary.
j. Sludge in cylinder block.
Drain, flush, and refill cylinder block.
k. Plugged water jacket
Drain system (para 2-108 and 2-
109). Disconnect radiator hose and
reverse-flush the radiator. Refer to
TM 750-254.
l. Scale in cylinder block.
Clean and neutralize system. Refer to
TM 750-254.
28 Overcooling ( i n a b i l i t y to attain
Refer to item 2 7 f
a. Defective thermostat
engine operating temperature
b. Inaccurate temperature gage.
Replace gage (para 2-153).
after suitable warmup).
TRANSMISSION TRANSFER
29 Excessive noise
a. Insufficient lubrication.
Check level and if required, add
lubricant according to lubrication
order (LO 9-2320-211-12).
b. Propeller shaft misalined or out of
Check universal joints for worn
balance.
needle bearings (para 2-178).
Replace if necessary. Check
propeller shaft for alinement and
check flanges for loose mounting
bolts.
30 Loss of lubricant
a. Loose drain plugs
Tighten drain plugs
b. D a m a g e d g a s k e t s , s e a l s , o r
Notify supporting maintenance
housings.
personnel.
c. Inoperative ventilating valves.
Clean ventilating valves (para 2-
31 Excessive lubricant
Overfilled
Check lubricant level and drain to
level of filler plug.
PROPELLER SHAFTS
32 Excessive noise or vibration.
Lubricate according to lubrication
a. Lack of lubrication
order (LO 9-2320-211-12).
Replace worn parts (para 2-178).
b. Worn universal joint parts.
* Refer to footnote at end of table.
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