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  Chart 2-1. Troubleshooting-Continued
Corrective Action
Probable Cause
Malfunction
4. Excessive engine vibration
a. Loose, worn, or defective engine
and tighten all mountin bolts
mounts
securely.
b. T i g h t e n p u l l e y m o u n t i n g b o l t
b. Loose pulley and damper
c. Replace defective pulley or damper
c. Defective pulley or damper
d. Refer to (1) above.
d. Misfiring
e. R e m o v e f a n b e l t s f o r s h o r t
e. Unbalanced fan
duration. If vibration is no longer
evident, replace fan (para 5-4).
5. Engine smokes
a. Worn piston rings
b. Defective valves
6. Engine knocks excessively
a. Broken valve spring
b. Carbon build-up on pistons
33).
c. Tighten bolts or replace bearing
c. Loose connection rod or main
bearing bolts or worn bearings
7 . Low or no lubricating oil pressure
a. Worn main bearing
b. Worn oil pump gears
indication
c. R e p a i r o r r e p l a c e a d e f e c t i v e
c. Pressure regulating valve worn or
pressure regulating valve (para 5-
stuck thus restricting the flow of
24.
oil
D i s a s s e m b l e starter and replace
8. Starter will not crank engine
Armature burned out
armature (para 5-21).
a. Disassemble generator and replace
9. Generator not charging
a. Generator
shorted
armature (para 5-20).
b. R e p l a c e a d e f e c t i v e g e n e r a t o r
b. Brush spring tension too low
brush spring (para 5-20).
10. Fully charged battery and a high
a. Disassemble generator and repair
a. Short circuit in generator
charging rate
or replace as necessary (para 5-
20).
b. Adjust (Refer to TM 5-2410-233-
b. Generator regulator not operating
20).
properly
a. Refer to TM 5-2410-233-20.
11. Transmission does not operate in
a. Leakage in external lines
b. C h e c k p r e s s u r e s a t t e s t p o i n t s
b. Leakage within transmission
any speed
c. Remove valve for inspection and
c. Pressure relief valve in hydraulic
repair (para 6-4).
control valve stuck open.
d. Remove valve for inspection and
d. Check valve stuck in bore
repair (para 6-8).
e. Remove valve for inspection and
e. Differential valve sticking closed
repair (para 6-4).
f. Safety valve improperly adjusted
g. Torque divider failure
a. I n s p e c t d i r e c t i o n a l v a l v e a n d
1 2 . Tractor remains in gear with
a. Obstruction preventing directional
remove any obstruction (para 6-
clutch from releasing.
selector valve in neutral
3).
b. Control linkage improperly ad-
justed
c. Speed and safety valve improperly
adjusted
13. Ripper will not raise
a. Defective relief valve in hydraulic
a. Remove valve for inspection and
repair (para 4-5).
control
b. Improper relief valve setting
Remove and inspect valve (para 4-
Defective relief valve in hydraulic
14. Ripper will not lower
4).
control
Inspect and repair cylinder (para
Worn cylinder piston rod packing
15. Ripper will not stay in ground
4-10).
and seals
a. Replace broken brake spring (para
16. Winch brake not holding
a. Broken brake spring
3-14).
properly
b. Remove valve for inspection and
b. Sticking or damaged piston in
repair (para 3-13).
winch control valve
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