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Page Title:
Table 2-1. Troubleshooting - CONT |
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 TM 10-3930-609-35
Malfunction
Probable cause
Corrective action
distance, clockwise to shorten
stopping distance. Run truck on
ground at top speed, reverse truck,
and measure stopping distance.
Readjust PLUGGING control as
required to obtain desired plugging
action, observing that control is never
set to the extreme counter-clockwise
position.
b.
Defective 4 REC.
b.
Check 4 REC and replace if defective
c.
Fuse FUA blown.
c.
Replace.
6. Pump motor does not start.
a.
Open circuit through relay IMP coil.
a.
(1) Check for blown fuse 2 FU.
(2) With an ohmmeter check con-
tinuity of relay IMP energizing
circuit and check IMP coil. See
coil replacement.
b.
Contacts of relay IMP defective.
b.
Repair or replace contacts and in-
spect relay for other possible defects
c.
Defective pump motor.
c.
Check motor, remove and repair as
required (para 3-87 through 3-93).
Brakes
1. Brakes dragging.
Master cylinder compensating port
Overhaul brake master cylinder
plugged.
2. Brake pedal goes to floor, no resist-
a.
High rate of fluid leakage at wheel
a.
Repair wheel cylinder (para 3-32).
ance.
cylinder.
b.
High rate of fluid leakage from mas-
b.
Repair brake master cylinder
ter cylinder.
3. Brake pedal under force gradually
a.
Scored master cylinder barrel or de-
a.
Repair brake master cylinder
goes to floor.
fective cup in master cylinder.
b.
High rate of fluid leakage from
b.
Repair wheel cylinder (para 3-32).
cylinder.
c.
High rate 6f fluid leakage from mas-
c.
Repair brake master cylinder
ter cylinder.
4. Heavy braking action.
Brake backing plate loose on axle
Tighten or replace brake backing
housing.
plate (para 3-27 through 3-31).
5. Truck pulls to one side.
Brake backing plate loose on axle
Tighten or replace brake backing
housing.
plate (para 3-27 through 3-31).
Steering
1. Steering difficult.
a.
Bent steering column.
a.
Overhaul steering gear (para 3-87
through 3-43).
b.
Broken spindle pin or steering axle.
b.
Overhaul steering axle (para 3-16
through 3-22).
c.
Jammed ball nut in steering gear.
c.
Overhaul steering gear (para 3-7
through 3-43).
2. Excessive looseness in steering.
a.
Steering gears worn.
a.
Overhaul steering gear (para 3-37
through 3-43).
b.
Tie rod ends worn.
b.
Overhaul steering axle (para 3-16
through 3-22).
Hydraulic
1. Lift carriage will not lift load.
a.
Hydraulic pump defective.
a.
Overhaul hydraulic pump (para 3-45
through 3-51).
b.
Defective seals in hoist cylinder.
b.
Repair hoist cylinder (para 3-67
through 3-72).
c.
Hydraulic pump motor defective.
c.
Overhaul pump motor (para 3-83
through 3-93).
d.
Hydraulic control valve defective.
d.
Overhaul hydraulic direction control
valve (para 3-53 through 3-58).
2. Load creeps down from raised
a.
Leakage past rings in hoist cylinder.
a.
Repair hoist cylinder
position.
2-7
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