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 Section VI. TROUBLESHOOTING
may occur are listed in table 4-2. Each malfunction
4-12. General
stated is followed by a list of probable causes of the
This section provides information useful in diagnosing
trouble and the recommended corrective action.
and correcting unsatisfactory operation or failure of the
forklift truck and its components. Malfunctions which
Table 4-2. Troubleshooting
Malfunction
Probable cause
Corrective Action
1. Brake pedal goes to floorboard or a.
a.
No brake fluid.
Add brake fluid (para 4-32).
b.
b.
is spongy.
Air in brake system.
Bleed system (para 4-35).
c.
c.
Brake line broken.
Replace line (para 4-34).
d.
d.
Other causes.
Refer other causes to direct and
general support maintenance
personnel.
a. Brake line kinked or clogged.
a.
2. Brakes are dragging (both or one
Replace line (para 4-34).
side only).
b. Wheel cylinder contaminated.
b. Replace wheel cylinder (para 4-33).
c. Refer other causes to direct and
c-. Other causes.
general support maintenance
personnel.
a. Brake lining worn or oily.
a. Replace (para 4-31).
3. Truck pulls to one side when
braking.
b. Brake shoes out of adjustment.
b. Adjust (para 4-31)
c. Brake line kinked or clogged.
c. Replace (para 4-34).
d. Other causes.
d. Refer other causes to direct and
general support maintenance
personnel.
4. Seat brake does not hold.
a. Not enough cable take-up.
a. Adjust yoke (para 4-30).
b. Other causes.
b. Refer other causes to direct and
general support maintenance
personnel.
a. Emergency switch not in reset
a. Reset Switch (para 4-16).
5. Failure to drive (forward or
reverse).
position.
b. Seat switch defective.
b. Refer to direct and general support
personnel.
c. Power or control fuses blown.
c. Replace fuses (para 4-21).
d. Accelerator pedal linkage loose or
d. Refer to direct and general
broken.
support personnel.
e. Battery connector not engaged or
e. Clean and engage contacts (
contacts corroded.
f. Other causes.
f. Refer other causes to direct and
general support maintenance
personnel.
a. Dragging foot brakes.
a. Check brake adjustment (para 4-31
6. Truck will not operate at
maximum speed.
b. Battery low or defective.
b. Replace battery (para 4-25).
c. Other causes.
c. Refer other causes to direct and
general support maintenance
personnel.
a. Emergency switch not in reset
a. Reset switch (para 4-16).
Failure to lift and/or tilt.
position.
b. 'Power or control fuses blown.
b. Replace fuses (para 4-21).
c. Not enough oil in hydraulic oil
c. Fill oil reservoir (para 4-48).
reservoir.
d. Other causes.
d. Refer other causes to direct and
general support maintenance
personnel.
8. Truck does not steer within the
Refer to direct and general support
within minimum turning radius.
maintenance personnel.
a. Low oil level.
a. Add oil (para 4-27).
9. Drive-axle noise on drive.
b. Oil too old or wrong type.
b. Change oil (para 4-27).
c. Other causes.
c. Refer other causes to direct and
general support maintenance
personnel.
4-5
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