TM 5-3810-288-12
Section V. TROUBLESHOOTING
Each malfunction stated is followed by a list of probable
3-33. General
causes of the trouble.
The corrective action
This section provides information useful in diagnosing
recommended is described opposite the probable cause.
and correcting unsatisfactory operation or failure of the
Any trouble beyond the scope of organizational
crane (upper) portion of the Model M320T truck crane
maintenance shall be reported to direct support
and its components. Malfunctions which may occur are
maintenance.
listed in table 3-2.
Table 3-2. Troubleshooting
Malfunction
Probable cause
Corrective action
a. Batteries discharged or cables
a. Replace batteries (para 3-49) or
1. Engine will not crank.
loose or corroded.
clean and tighten cables (para 3-7).
b. Faulty starter relay
b. Refer to paragraph 3-49 and replace relay.
a. Out of fuel.
2. Engine will not start
a. Fill fuel tank (para 3-13).
b. Service air cleaner (para 3-9).
b. Restricted air intake.
c. Improper ignition.
c. Service distributor.
d. Replace damaged wiring or spark plug.
d. Engine misfires.
e. Improper valve clearance
e. Adjust valves.
f. Defective batteries
f. Replace or recharge
g. Low temperature
g. Use cold weather starting aid.
3. Engine overheats
a. Radiator coolant level low.
a. Add coolant (para 3-8).
b. Engine oil level low.
b. Add oil (para 3-11).
c. Water pump V-belt loose.
c. Adjust belt (para 3-49).
d. Water pump faulty.
d. Replace water pump (para 3-48).
e. Rain shutters closed
e. Open rain shutters (fig. 2-14).
f. Collapsed hose or loose connection.
f. Check condition of coolant hose,
tighten loose connection.
g. Defective thermostat
g. Replace.
a. Drain crankcase and refill with
a. Oil too light or diluted.
4. Low oil pressure.
correct oil.
b. Oil level low.
b. Add oil (para 3-11).
c. Change oil filters (para 3-41)
c. Oil filter clogged.
d. Refer to (para 3-41) and replace
d. Faulty oil pressure sender.
oil pressure sender.
5. Batteries discharge with
a. Faulty alternator.
a. Repair or replace alternator
with engine running.
b. Alternator V-belt loose.
b. Adjust V-belt tension (para 3-49).
c. Replace alternator (para 3-49) or
c. Alternator brushes worn.
refer to proper authority.
d. Loose connections.
. Inspect wiring and tighten loose
connections (para 3-7).
a. Check oil lines and righten loose
6. Excessive oil consumption a. Oil leaks.
lines (para 3-41).
b. Poor quality or wrong grade oil
b. Refer to lubrication order.
for weather.
3-26
