19
TROUBLE SHOOTING
Problem Cause
Solution
Jack does not lift.
-
Release valve is open.
-
Low oil level.
-
Air in the system.
-
Load is above jack’s capaci-
ty.
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Release and/or bypass
valve not working correct-
ly.
-
Worn or defective packing.
-
Check that the release valve is
closed by the position of the han-
dle. Release valve may need clean-
ing.
-
Fill with suitable hydraulic oil and
purge air from the system.
-
Purge air from the system.
-
Use jack of suitable capacity.
-
Clean to remove dirt or foreign
matter. Replace hydraulic oil.
-
Replace the packing.
Jack lifts only par-
tially.
-
Too much or not enough oil.
-
Check hydraulic oil level.
Jack lifts slowly.
-
Pump not working correctly.
-
Leaking seals.
-
Check the pump.
-
Replace seals.
Jack lifts load but
doesn’t hold it.
-
Cylinder packing is leaking.
-
Release or bypass valve not
working correctly.
-
Air in the system.
-
Replace the packing.
-
Inspect valves and replace if nec-
essary.
-
Purge air from the system.
Jack leaks oil.
-
Worn or damaged seals.
-
Replace seals.
Lifting arm (ram)
will not lower.
-
Release valve is closed.
-
Open the release valve by pulling
on and turning the handle coun-
ter-clockwise. It may be necessary
to clean the release valve.
Lifting arm (ram)
lowers slowly.
-
Cylinder damaged internally.
-
Return spring(s) is damaged.
-
Link section is binding.
-
Contact an authorized service
center.
-
Replace return spring(s).
-
Lubricate link section.
