Enerpac ST-202 - Manual (Page 7)

7.2 Pressure and Flow Rate
Clamp arm length (L) determines operating pressure
setting and flow rate. See Clamping Force -v- Arm
Length Graphs on page 3 for clamp arm length, pressure
setting and flow rate. Set operating pressure and flow
rate according to the limits established by the length of
the clamp arm. Do not exceed the load-to-length
pressure ratios. As the arm length increases, the
clamping force and maximum operating pressure are
reduced.
CAUTION: It is very important that you use the
correct pressure and flow settings. Operating
outside these limits will cause damage to the
swing cylinder. Damage caused by exceeding rated
pressure and maximum flow is NOT COVERED BY
WARRANTY.
8.0 MAINTENANCE
Maintenance is required when wear or leakage is
noticed. Occasionally inspect all components to detect
any problem requiring service and maintenance.
Enerpac offers ready-to-use Repair Parts Kits. Repair
Parts Sheets are available with assembly drawing and
parts list. Contact Enerpac.
IMPORTANT: Consult the Repair Parts Sheet for service
information about correct assembly and disassembly.
Incorrect maintenance and service such as wrong torque
values may cause product malfunctions and/or personal
injury.
9.0 TROUBLESHOOTING
The following information is intended to be used only as
an aid in determining if a problem exists. For repair
service, contact your Distributor or Authorized Enerpac
Service Center.
L
7
Problem Possible Cause Solution
Cylinder will not clamp/unclamp. 1. Pump release valve open 1. Close pump release valve
2. No oil in pump reservoir 2. Fill pump reservoir
3. Air in system 3. Remove air from hydraulic system
4. Couplers not fully tightened 4. Retighten couplers
5. Blocked hydraulic line 5. Check valves, fittings, and tubing
6. Spring broken in cylinder 6. Replace spring
Cylinder advances part way. 1. Oil level in pump too low 1. Fill pump reservoir
2. Plunger binding 2. Replace damaged parts —refer to Repair
Parts Sheet
Kick-out mechanism activated. 1. Oil flow too high 1. Reduce oil flow
2. Workpiece-clamp arm collision 2. Prevent clamp arm collision—refer to
Turning Mechanism Protection on page 8
Cylinder clamps/unclamps 1. Leaking connection or loose fitting 1. Retighten fittings, couplers, and tubing
slower than normal. 2. Restricted hydraulic line 2. Check valves, fittings, and tubing
3. Pump malfunction 3. Refer to pump Instruction Sheet
Cylinder clamps/unclamps 1. Seals damaged 1. Replace seals — refer to Repair Parts Sheet
but will not hold pressure. 2. Leaking connection 2. Retighten fittings, couplers, and tubing
3. Pump malfunction 3. Refer to pump Instruction Sheet
Cylinder leaks oil. 1. Seals damaged 1. Replace seals—refer to Repair Parts Sheet
2. Plunger worn or damaged 2. Replace damaged parts—refer to Repair
Parts Sheet
Clamp arm does not make swing 1. Clamp arm loose 1. Reposition and tighten clamp arm—refer to
movement. Attaching Clamp Arm
2. Plunger damaged 2. Replace damaged parts
—refer to Repair Parts Sheet