4
4 . Remove jack handle when not in use .
WARNING
Stay clear of loads supported by hydraulics. After the load has been raised, it
should be blocked, using material capable of supporting the load.
1 . Use wrench end of jack handle to open the valve a very small amount to avoid sudden
dropping of the load . Turn release valve counter-clockwise very slowly to control the speed of
descent .
WARNING
NEVER turn release valve quickly to full open when there is a load on the jack. The
load will fall uncontrolled, leading to personal injury and/or property damage.
2 . All jacks are load return . Without a load, the plunger may not retract . Adding weight to the
plunger will make it retract .
CAUTION
If you decide to stand on the jack, be sure the jack is stable and hold on to a sturdy
object to avoid injury.
1 . Before storing, inspect and clean the jack .
2 . Close the air vent on 30 - 100 Ton models .
3 . Store jack upright to protect the seals .
4 . Periodically lubricate the jack pump beam .
The following is intended as an aid in determining if a problem exists . DO NOT disassemble the
jack . For repair service, contact the Authorized Enerpac Service Center in your area .
Problem
Possible Cause
Solution
Jack will not rise,
rises part way, or
rises in spurts .
Load is too heavy .
Do not attempt to lift more than rated capacity .
Release valve open .
Close release valve .
Low fluid level .
Add fluid . See page 3 .
Air in system .
Remove air as directed on page 3 .
Plunger binding .
Have jack serviced by a qualified hydraulic technician .
Jack rises, but loses
pressure .
Load is too heavy .
Do not attempt to lift more than rated capacity .
Plunger seal leaking .
Have jack serviced by a qualified hydraulic technician .
Plunger will not retract . No load on the plunger .
Put weight on the plunger to help it retract .
Release valve closed .
Open the release valve slowly . See "Lowering the Load" .
Air vent closed .
(on 30 - 100 Ton models)
Open air vent valve .
Reservoir is over-filled .
With jack in the upright position and no load, remove fill
plug and allow oil to drain out of fill hole .
Worn or damaged seals .
Have jack serviced by a qualified hydraulic technician .
Plunger damage .
Have jack serviced by a qualified hydraulic technician .
Lowering the Load
MAINTENANCE
TROUBLESHOOTING
CAUTION
In certain situations, the pump handle can kick back. Always keep body away from
the line of force of the handle.
