4.0 OPERATION
Operate the hydraulic pump to advance and
retract the cylinder. Some single-acting
cylinders are spring-return, others are load-
return. The speed of retraction is affected by
the length of the hose and other restrictions in
the line.Double-acting cylinders are powered in
both directions by the pump.
The cylinder stop ring is designed to take the
full load. However, to reduce cylinder wear, use
less than full stroke when possible.
5.0 MAINTENANCE
1. Use only Enerpac oil with these cylinders.
The use of any other oil may invalidate your
warranty.
2. Use dust caps when cylinders are
disconnected from the hose. Keep entire
cylinder clean to prolong cylinder life.
3. Store cylinders upright to prevent seal
distortion.
6.0 TROUBLESHOOTING
These cylinders should be repaired only by
Authorized Enerpac Technical Service Centers.
Single-acting cylinders are spring-loaded and
require special disassembly techniques to
prevent personal injury.
3
PROBLEM
Cylinder will not advance.
Cylinder advances part way.
Cylinder advances in spurts.
Cylinder advances slower than normal.
Cylinder advances but will not hold.
Cylinder leaks oil
Cylinder will not retract or retracts slower
than normal.
Oil leaking from external relief valve.
POSSIBLE CAUSE
Pump release valve open.
Coupler not fully tightened.
Oil level in pump is low.
Pump malfunctioning.
Load is too heavy for cylinder.
Oil level in pump is low.
Coupler not fully tightened.
Cylinder plunder binding.
Air in hydraulic system.
Cylinder plunger binding.
Leaking connection.
Coupler not fully tightened.
Pump malfunctioning.
Cylinder seals leaking.
Pump malfunctioning.
Leaking connection.
Incorrect system set-up.
Worn or damaged seals
Internal cylinder damage.
Loose connection.
Pump release valve is closed.
Coupler not fully tightened.
Pump reservoir over-filled.
Narrow hose restricting flow.
Broken or weak retraction spring.
Cylinder damaged internally.
Coupler not fully tightened.
Restriction in return line.
air
air
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