TM 5-3810-288-12
Table 3-2. Troubleshooting-Continued
Malfunction
Probable cause
Corrective action
a.
a.
7. Lights fail.
Defective or burned out lamps.
Replace lamps (para 3-49)
b.
b.
Short in wiring.
Replace wiring (para 3-49).
c.
Defective switch.
c.
Replace switch (para 3-49)
d.
d.
Loose connections.
Tighten connections (para 3-49)
8. Lights dim.
a. Lens dirty.
a. Clean lens.
b. Faulty ground.
b. Clean ground terminal.
a. Adjust swing clutch (para 3-22).
9. Revolving frame will not
a. Swing clutch improperly adjusted
swing.
b. Disengage swing brake (para 2-14).
b. Swing brake engaged.
c. Swing lock engaged.
c. Disengage swing lock (fig. 2-36).
d. Refer to direct or general support
d. Swing shaft broken.
maintenance.
10. Revolving frame teeters.
Hook rollers improperly adjusted
Adjust hook rollers (para 3-68).
11. Crane will not lift rated
a. Front or rear drum clutch slips.
a. Adjust clutch (para 3-19 and 3-20)
capacity.
b. Engine not delivering full power.
b. Refer to direct or general support
maintenance.
c. Some mechanical item binding in
c. Refer to direct or general support
power transmission system
maintenance
a. Pay out cable and respool properly
12. Cables flatten out or wear a. Cable improperly spooled on
excessively.
drum.
b. Sheaves seized on shafts.
b. Loosen sheaves and lubricate per
lubrication chart
c. Cable out of sheave.
c. Place cable in sheave.
d. Cable clamps or sockets incor-
d. Install so the loaded side presents
rectly installed.
a straight line pull through the eye of the
socket.
a. Adjust boom hoist clutch (para 3-21).
13. Boom will not raise.
a. Boom hoist clutch slips.
b. Boom hoist mechanical component b. Report to direct or general support
failure.
maintenance.
c. Boom already in highest position.
c. Lower boom.
14. Boom will not lower.
a. Boom supported on safety pawl.
a. Lift boom slightly, disengage pawl
and lower boom.
b. Friction shoes for boom hoist
b. Adjust boom hoist planetary pawls
planetary pawls improperly ad-
justed.
15. Hard lever or pedal
a. Incorrect adjustment.
a. Adjust correctly (para 3-26).
operation or excessive play
b. Lack of lubrication.
b. Lubricate. See lubrication order.
16. Clamshell operates
a. Rear drum brake dragging
a. Adjust rear drum brake (para 3-62)
erratically
b. Clutches slipping or grabbing.
b. Adjust front and rear drum clutches (para
c. Bucket hinges not lubricated.
c. Lubricate hinges per lubrication order.
3-27
