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Page Title:
Troubleshooting Starting System |
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 3-5. Troubleshooting Starting System
Corrective Action
Malfunction
Probable Cause
a. Refer to pertinent vehicle Technical
a. Improper starting procedure being
1. Starter will not operate.
M a n u a l , Appendix A for proper starting
used.
procedures.
b. Refer to pertinent vehicle Technical
b . Starter not receiving electrical
Manual,
current.
covering troubleshooting vehicle electrical
system.
c. Refer to 1b, para 3-4.
c. Failed starter.
d. Refer to 1b, para 3-7.
d. Failed starter relay.
a. Refer to 1c, para 3-4.
a. Failed starter drive gear.
2 . Starter runs but will not
b. Refer to 1b, para 3-4.
b. Failed starter drive clutch.
crank engine.
a. Drain and refill with proper grade oil for
a. Improper grade engine oil.
3. Starter operates but fails to
prevailing temperature.
c r a n k e n g i n e a t proper
b. Refer to 1b, para 3-4.
b. Defective starter.
cranking speed.
c. Partially seized engine caused by
c. Turn engine manually. If engine does not
tight engine bearings.
turn freely, disassemble engine and replace
or repair damaged parts.
Refer to pertinent vehicle Technical
a. Generator regulator not operating.
1. Generator runs but will not
M a n u a l , Appendix A for troubleshooting
produce electrical current.
generator regulator.
b . Improperly connected generator
Refer to pertinent vehicle Technical
cables.
Manual, Appendix A for correct cable
connections and procedures.
c. Generator not producing electrical
Remove generator (table 4-1). Refer to TM
current.
9 - 2 9 2 0 - 2 2 4 - 3 5 and overhaul generator.
Install generator (table 4-1).
Replace generator, Refer to 1c, above.
a. Failed generator shaft.
2. Generator does not turn or
R e m o v e generator (table 4-1). Remove
b. Generator drive gear failed.
operate.
generator drive adapter and drive gearshaft
gearshaft (table 6-1). Check generator idler
damaged, disassemble engine and remove
idler gear. Install new gear (table 7-1) and
assemble engine. Install generator (table 4-
1).
System
1. Restricted air to turbosup-
a. Plugged air cleaner.
a . Service air cleaner. Refer to pertinent
erchargers (engine will not
vehicle Technical Manual, Appendix A for
develop full power).
procedures.
b. Repair or replace air induction hose. Refer
b. Collapsed air induction hose.
t o pertinent vehicle Technical Manual,
c . Remove turbosuperchargers (table 4-1).
c. Turbosuperchargers worn or fail
Refer to TM 9-2990-200-34 for overhaul
to operate.
instructions.
Install turbosuperchargers
d. Restrictions in air intake
d. Remove intake manifolds (table 4-4).
Remove restrictions. I n s t a l l i n t a k e
manifolds (table 4-4).
3-7
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