Enerpac SU7-Series - Manual (Page 10)

10
Table 13 - Troubleshooting Guide
Problem Possible Cause Solution
1. Cylinder will not
clamp/unclamp.
a. Pump release valve open. Close pump release valve.
b. No oil in pump reservoir. Fill pump reservoir.
c. Air in system. Remove air from hydraulic system.
d. Couplers not fully tightened. Retighten couplers.
e. Blocked hydraulic line. Check valves, fittings, and tubing.
f. Spring broken in cylinder.
(single-acting models only)
Replace spring.
2. Cylinder advances part way.
a. Oil level in pump too low. Fill pump reservoir.
b. Plunger binding.
Replace damaged parts - refer to cylinder
repair parts sheet.
3. Cylinder clamps/unclamps
slower than normal.
a. Leaking connection or loose fitting. Retighten fittings, couplers and tubing.
b. Restricted hydraulic line. Check valves, fittings and tubing.
c. Pump malfunction. Refer to pump instruction sheet.
4. Cylinder clamps/unclamps
but will not hold pressure.
a. Seals damaged.
Replace seals - refer to cylinder repair parts
sheet.
b. Leaking connection. Retighten fittings, couplings and tubing.
c. Pump malfunction. Refer to pump instruction sheet.
5. Cylinder leaks oil.
a. Seals damaged.
Replace seals - refer to cylinder repair parts
sheet.
b. Plunger worn or damaged.
Replace worn or damaged parts - refer to
cylinder repair parts sheet.
6. Clamp arm does not make
swing movement.
a. Clamp arm loose.
Reposition and tighten clamp arm - refer to
Section 6.4 for instructions.
b. Plunger worn or damaged.
Replace worn or damaged parts - refer to
cylinder repair parts sheet.
9.0 TROUBLESHOOTING
Allow only qualified hydraulic technicians to service the swing cylinder or system components. A system failure
may or may not be the result of a swing cylinder malfunction. To determine the cause of the problem, the
complete system must be included in any diagnostic procedure.
The information in the following chart is intended to be used only as an aid in determining if a problem exists.
For repair service, contact your local Enerpac Authorized Service Center.