Malfunction
Probable cause
Corrective action
10.Main chain drive
a Defective chain
a. Replace chain
excessively
noisy
b. Improper or in-
b. Refer to LO 5-3810-
sufficient
232-12
lubrication
c. Improper adjustment
c. Adjust main chain
drive (para 4-107).
11. Chain hoist
Improper insuf-
Refer to LO 5-3810-
gear noisy
ficient lubrication
232-12.
12.Crane boom or
a Hoist clutch slips
a. Adjust hoist clutch
hoist operation
(para 4-102).
rough or
b. Hoist brake bands
b. Adjust brake bands
inoperative
loose
c. Boom hoist brake
c. Adjust boom hoist
band loose
brake (para 4-103).
d .Grease on clutch
d. Clean and inspect
or brake bands
(para 4-98 thru
4-104).
13. Revolving frame
Swing clutches
Adjust swing clutches
teeters or will
out of adjustment
(para 4-99).
not swing
14. Continuous humming
Lack of lubrication
Check lubricant for
noise or noisy
or use of improper
correct amount and
front axle when
grade of lubricant
grade
Refer to LO
driving
in wheel bearing
5-3810-232-12.
15. Steering hard to
Loss of hydraulic
Tighten all lines and
operate
fluid
fittings
Fill reser-
voir as specified in
LO 5-3810-232-12.
16.Improper air
a. Air pressure in
o. Check governor settings.
pressure
system is above
Adjust air compressor
normal
unloading valve (para
4-139)
Replace gover-
nor if necessary (para
4-139).
b. Air reservoir
b. Inspect air reservoir.
damaged
4-7
