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0821 IH-5484
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.
Air in the hydraulic oil.
Add more oil.
Change the oil.
Adjust the setting screw. (See Operation)
Expel the air. (See Maintenance)
The forks do not descend.
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.
Too much hydraulic oil.
Replace the rod and/or cylinder.
Repair or replace component.
Adjust the setting screw. (See Operation)
Drain oil as needed.
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 hydraulic 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 Pallet Truck unless you are trained and authorized to do so.
1-800-295-5510
uline.com
