TM 10-3950-206-12
Table 4-2. Troubleshooting Chart - Continued
Malfunction
Probable cause
Corrective action
b. Worn piston ring.
b. Take compression check and report
an abnormal condition to direct
support unit.
a. Fan V-belt loose or broken.
a. Tighten or replace V-belt.
discharge.
b. Short circuit.
b. Check wiring
c. Test charging circuit, isolate and
repair fault.
21. Brakes drag.
a. Weak or broken return spring.
a. Replace spring. Adjust pedal for
Improperly adjusted pedal or
free play of 3/16 to 5/16 inch
linkage.
b. Wheel bearing loose.
22. Defective brakes.
a. Air in system.
b. Fluid low in master cylinder.
b. Fill master cylinder to within 1/4
inch below top.
c. Leaks in system.
c. Check system and correct.
23. Springy. spongy brake pedal.
Air in system.
24. Brake locked.
a. Brake pedal lacking free travel.
a. Adjust pedal for free play (para
b. Brakes frozen to drums (cold
b. Break loose by driving vehicle.
weather).
25. Brake noise or clatter.
a Brake lining worn.
a. Replace shoe and lining assembly
b. Grease on lining.
b. Correct leakage, clean or replace
shoe and lining assemblies
c. embedded in linings.
c. Clean lining with wire brush.
d. Improper or loose lining.
d. Replace shoe and lining assembly.
e. Brake shoe or drum distorted.
e. Replace defective components.
26. Excessive brake pedal pres-
a. Grease on linings.
a. Correct grease leakage and replace
sure necessary to activate
brakes.
b. Worn or glazed linings.
b. Clean up and replace shoe and
27. Crane pulls to one side.
Fluid or grease on brake lining.
Correct leaks and install new service
28. Lift mechanism will not
a. Hydraulic oil level too low.
a. Fill to proper level as shown on
lift load.
lubrication order.
b. Over load.
b. Remove excessive weight from
c. Hydraulic oil lines leaking.
c. Tighten fittings and install new
a. Hydraulic oil lines leaking.
a. Tighten fittings, and install new
raised position.
hose if necessary.
b. Hydraulic oil leak in dither intake
line connection or packing
glands.
30. Noise in power steering
a. Low oil level in power steering
a. Fill to proper level as shown on
system.
system.
lubrication order.
b. Clogged outlet line or oil filter
b. Clean reservoir. Clean lines, and
element.
replace element fill system to
c. Warped brakeshoes or defective
c. Replace shoe and lining assembly
brake lining.
d. Brakedrum scored or distorted.
31. Wheel wobbles.
a. Wheel bent.
a. Inspect mounting on hub, spindles
and drive axle.
b. Wheel loose on hub.
b. Tighten nuts or bolts.
c. Wheel bearing not adjusted.
4-9