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0321 IH-5441
OPERATING ISSUE
CAUSES
RECOMMENDATIONS
The forks do not lift to maximum
height.
Not enough hydraulic oil.
Add more oil.
The forks do not raise.
Not enough hydraulic oil.
The oil has impurities.
Discharge valve is out of adjustment.
Load is too heavy.
Temperature is too low.
Air in the hydraulic oil.
Add more oil.
Change the oil.
Adjust the setting screw.
(See Operation)
Reduce load.
Move truck to a warmer location.
Expel the air. (See Maintenance)
The forks do not lower.
The rod and the cylinder are deformed
from a seriously unbalanced load.
A part has been broken or been
deformed from an unbalanced load.
The setting screw is not in the correct
position.
Replace the rod or cylinder.
Repair or replace component.
Adjust the setting screw.
(See Operation)
Leaks.
Seals worn out or damaged.
Some parts may be cracked or worn out.
Replace seals with new ones.
Check and replace with new
ones.
The forks descend without
being lowered.
Impurities in the oil cause the discharge
valve to fail to close.
Air in the oil.
Seals worn or damaged.
Discharge valve is out of adjustment.
Change the oil.
Expel the air. (See Maintenance)
Replace with new ones.
Adjust the setting screw.
(See Operation)
TROUBLESHOOTING
NOTE: Do not attempt to repair the Heavy Duty Scissor Lift Pallet Truck unless you are trained and
authorized to do so.
1-800-295-5510
uline.com
