Enerpac ST-52 - Manual (Page 9)

9
1. Cylinder will not
clamp/unclamp.
2. Cylinder advances
part way.
3. Cylinder
clamps/unclamps
slower than normal
4. Cylinder
clamps/unclamps
but will not hold
pressure.
5. Cylinder leaks oil.
6. Clamp arm does
not make swing
movement.
A. Pump release valve open
B. No oil in pump reservoir
C. Air in system
D. Couplers not fully tightened
E. Blocked hydraulic line
F. Spring broken in cylinder
A. Oil level in pump too low
B. Plunger binding normal.
A. Leaking connection
B. Restricted hydraulic line
C. Pump malfunction
A. Seals damaged
B. Leaking connection
C. Pump malfunction
A. Seals damaged
B. Plunger worn or damaged
A. Clamp arm loose
B. Plunger damaged
A. Close pump release valve
B. Fill pump reservoir
C. Remove air from hydraulic system
D. Retighten couplers
E. Check valves, fittings, and tubing
F Replace spring
A. Fill pump reservoir
B. Replace damaged parts — refer to Repair
Parts Sheet
A. Retighten fittings, couplers, and tubing
B. Check valves, fittings, and tubing
C. Refer to pump Instruction Sheet
A. Replace seals — refer to Repair Parts Sheet
B. Retighten fittings, couplers, and tubing
C. Refer to pump Instruction Sheet
A. Replace seals — refer to Repair Parts Sheet
B. Replace damaged parts — refer to Repair
Parts Sheet
A. Reposition and tighten clamp arm — see
Attaching Clamp Arm
B. Replace damaged parts — refer to Repair
Parts Sheet
Clamp Arm Machining Specifications (page 13)
See Pressure and Flow Rate on page 8 to correctly measure the arm length. To determine the maximum
clamping force for the arm, refer to Operating Specifications — Maximum Flow Rate Chart on page 3.
Problem Possible Cause Solution