TM 5-3810-288-12
Table 7-2. Troubleshooting-Continued
Malfunction
Probable cause
Corrective action
a. Faulty alternator
a. Repair or replace alternator (para 7-41).
5. Batteries discharge with engine
running
b. Alternator V-belt loose.
b. Adjust V-belt tension (para 7-41).
c. Alternator brushes worn.
c. Replace alternator (para 7-41).
d. Loose connections.
d. Inspect wiring and tighten loose
connections.
a. Oil leaks.
a. Check oil lines and tighten loose
6. Excessive oil consumption.
lines.
b. Poor quality or wrong grade oil
b. Refer to lubrication chart
for weather.
a. Leaks in system
a. Replace defective compressor.
7. Incorrect air brake system
pressure
b. Governor set at wrong pressure
b. Adjust governor (para 7-46).
range.
a. Faulty fuel pump or dirty fuel
a. Repair or replace fuel pump (para 7-40).
8. Engine tends to stall at full
load
pump filter.
b. Dirty sediment bowl.
b. Clean sediment bowl (para 7-12).
c. Dirty air cleaner.
c. Clean air cleaner (para 7-14).
d. Low compression
d. Check compression (para 7-49).
a. Low fluid level.
a. Add power steering fluid (para 7-44).
9. Power steering is "spongy"
and makes "groaning" sound
b. Mechanical linkage binds.
b. Refer to higher authority.
10. Engine noisy
Tappet clearance excessive.
Adjust tappets (para 7-50).
a. Improper clutch adjustment.
a. Adjust clutch (para 7-51).
11. Engine clutch overheats or
jumps out of engagement. b. Clutch plates worn excessively.
b. Refer to Direct Support Mainte-
nance.
a. Restricted fuel line.
a. Replace line (para 7-40).
12. Engine "cuts out" quite sud-
b. Faulty fuel punp.
b. Replace pump (para 7-40).
dently under load
c. Dirty fuel tank.
c. Drain fuel tank (para 7-40).
a. Intake manifold leaks.
a. Repair intake manifold (para
13. Rough or erratic engine idling
b. Faulty carburetion
b. Repair or replace carburetor (para
c. Dirty air cleaner.
c. Clean. (para 7-14).
a. Low octane fuel.
a. Use correct fuel (para 3-13).
14. Engine knocks
bearings damaged.
Support Maintenance.
a. If exhaust is black, incomplete
a. Replace spark plugs (para 7-41)
15. Engine exhaust is smoky.
fuel combustion due to poor
and adjust ignition timing (para 7-41).
spark plugs or ignition timing.
b. If exhaust is blue, the engine is
b. Refer to Direct and General Sup-
port Maintenance.
burning oil due to leaking oil
into exhaust manifold or blow-
by past piston rings.
7-13
