TM 10-3950-206-12
Table 4-2. Troubleshooting Chart - Continued
Malfunction
Probable cause
Corrective action
32. Battery discharged.
a. Battery solution low.
a. Add distilled water to bring level
above plates. Inspect for cracked
case (para 3-10).
b. Short in battery cell.
b. Replace battery (para 3-10).
c. Alternator not charging
c. Tighten V-belt. Test or replace
regulator (para 4-22). Test or
replace alternator (para 4-21).
d. Loose or dirty connections.
d. Clean and tighten connections.
e. Broken cables.
e. Replace cables (para 4-27).
f. Excessive use of starting motor.
f. Tune up engine. Charge battery.
g. Short circuits.
g. Replace defective wiring
33. Lights do not light
a. Switch not fully on.
a. Turn switch on fully (para 2-7).
b. Loose or dirty connections.
b. Clean and tighten.
c. Broken wire.
c. Replace or repair wire or terminal.
d. Wiring circuit open.
d. Repair wiring circuit or replace
defective parts.
e. Light burned out.
e. Replace light (para 4-30).
f. Defective switch.
f. Replace switch.
34-. Lights dim.
a. Loose or dirty connections.
a. Clean and tighten connections
b. Wiring short-circuited.
b. Correct short-circuit or replace
defective parts.
35. Horn sounds continuously.
Short circuit in wiring between horn
Replace wire.
and horn button.
36. Horn will not operate.
a. Loose or dirty connections.
a. Clean and tighten connections.
b. Open circuit.
b. Repair or replace wire.
c. Defective horn.
c. Replace horn.
37. Drive axle noise.
a. Unevenly worn tires.
a. Replace tires (para 4-62a).
b. Improperly adjusted wheel bearing
b. Adjust bearing (para 4-63).
c. Lack of lubricant.
e. Add lubricant.
38. Steering is difficult.
a. Lack of lubrication.
a. Lubricate.
b. Steering system hydraulic oil low.
b. Fill to proper level.
c. Power steering cylinder defective.
C. Replace cylinder (para 4-72).
39. Crane wanders or weaves.
Loose wheel bearings.
Adjust wheel bearing (para 4-63).
40. Shimmy or wobble at low
Loose wheel bearings.
Adjust wheel bearing (para 4-63).
speeds.
41. Vehicle pulls to one side.
a. Odd size or new and old tires on
a. Match tires.
opposite wheels.
b. Tight wheel bearing.
b. Adjust, lubricate wheel bearing
42. Hydraulic pump not
a. Tank oil level low.
a. Add recommended oil.
delivering.
b. Oil intake hose or suction filter
b. Replace filter cartridge, clean
plugged.
intake pipe (para 4-75).
c. Air leak in suction line.
c. Tighten connections or replace line.
d. Oil viscosity too high.
d. Use oil recommended by lubrication
order.
43. Lift mechanism will not
a. Hydraulic oil level too low.
a. Fill to proper level as shown on
lift load.
lubrication order.
b. Overload.
b. Remove excessive weight from
hook block.
c. Hydraulic oil lines leaking.
c. Tighten fitting and install new
hose if necessary.
44. Load creeps down from
a. Hydraulic oil lines leaking.
a. Tighten fittings, and install new
raised position.
hose if necessary.
b. Hydraulic oil leak in either intake
b. Inspect and tighten (para 4-76).
line connection or packing
glands.
45. Crane will not move in
a. Parking brake not released.
a. Release bake.
either direction.
b. Transmission oil level low.
b. Fill to proper level.
c. Transmission control linkage not
c. Readjust linkage (para 4-57).
properly adjusted.
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