TM 5-3810-289-12
Section IV. TROUBLESHOOTING
3-7.
General
3-8.
Troubleshooting Chart
In chart 3-1, each malfunction listed is followed by
This section provides information for diagnosing and
parable causes of the trouble. The corrective action
correction unsatisfactory operation or failure of the
required is described opposite the probable cause.
crane-shovel and its components. Any trouble beyond
the scope of operator's maintenance shall be reported to
organizational maintenance.
Chart 3-1. Troubleshooting
Malfunction
Probable cause
Corrective action
1. Engine fails to start.
a. Engine too cold.
a. Use starting aid.
b. Lack of fuel.
b. Check fuel tank.
c. Air cleaner clogged.
c. Service air cleaner (fig. 3-6).
2. Irregular firing of engine.
Air cleaner clogged.
Service air cleaner (fig. 3-6).
3. Engine smokes.
a. Crankcase oil level too high.
a. Check and drain any excess oil. Re-
b. Air cleaner clogged.
fer to current LO.
b. Service air cleaner (fig. 3-6).
4. Engine overheating indicated. a. Low coolant level.
a. Add coolant.
b. Loose fan belt.
b. Adjust fan belt (para 3-16).
c. Continuous overload.
c. Reduce load.
d. Oil level low.
d. Add oil (para 3-4).
5. Engine knocks excessively.
Lack of lubricating oil.
Check and fill crankcase to proper oil
level (refer to current LO).
a. Check and refill crankcase (refer to LO).
b. Oil filter clogged.
b. Service oil filter (fig. 3-1).
sure indication.
c. Leaking connections.
c. Tighten connections.
d. Oil too light or diluted.
d. Drain crankcase and refill with proper oil
(refer to LO).
7. Starter will not crank engine.
Loose connection or defective
Inspect battery cables and wiring for
wiring.
loose connections or defective wiring.
Tighten connections. Report defective
wiring to organizational maintenance.
8. Alternator not charging.
Alternator drive belt loose or
Adjust loose belt (para 3-17).
broken.
9. Alternator output low or un-
Alternator belt not properly
Adjust belt (para 3-17).
steady.
adjusted.
10. Fully charged battery and
Poor ground connection at
Check ground connection.
high charging rate.
Regulator.
11. Batteries will not hold charge. a. Loose terminals or connections.
a. Check and tighten.
b. Short in electrical system.
b. Check cables and wiring.
12. Floodlights and/or dash light a. Electrical system disconnect
a. Turn switch to ON position.
Switch is in OFF position.
b. Loose connection.
b.
Tighten connections.
a. Cable sheaves stuck to shaft.
a.
Free sheaves and lubricate.
13. Cables wear excessively.
b.
Lubricate cables.
b. Cables lack lubrication.
a. Cable crossed on drum.
a.
Wind cables evenly and correctly on drums.
14. Cables flatten out.
b. Cable too long, allowing cable to
b.
shorten cable to proper length.
Pile up on drum.
a. Crawler not positioned properly.
a.
Level position of crawler.
15. Crane tilts under load.
b. Overload.
b.
Check for overloading.
a. Boom hoist clutch slips
a.
Adjust clutch brakebands (para 3-29).
16. Boom will not raise.
b. Cable frayed or off sheave.
b.
Replace cable in sheave and inspect.
3-6
