13
Problem
Cause
Solution
Jack lifts only partially.
-
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 necessary.
-
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 clockwise. It may be
necessary to clean the release valve.
Lifting arm (ram) low-
ers 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.
