Hydraulic Connections - Enerpac A258 Mode D'emploi

4.3 Hydraulic Connections

1. Install a gauge in-line from the pump for added safety and
better system control.
2. Connect a hose from pump to the cylinder.
3. Make sure all couplers and fittings are tight and leak free.
NOTE: Use 1- wraps of Teflon tape on NPTF fittings,
1/2
leaving the first complete thread free of tape to ensure that
pieces of tape do not break off and enter the system, causing
damage.
CAUTION: Avoid sharp bends and kinks in the hose
which may cause damage.
5.0 OPERATION
WARNING: Check all press set-ups and load fixtures
for safe operation.
1. Center workpieces in the press.
WARNING: Items not aligned with the center of the
cylinder are unstable under pressure and can be
propelled out of the press, causing serious personal
injury or equipment damage.
2. If spacers are used in the set-up, they should be constructed
in one solid piece or tack welded together for stability.
5.1 Advancing the Cylinder
For complete operating instructions refer to the instruction sheets
included with the pump and cylinder.
Hand Pumps
On hand pumps with release valves, close relief valve and raise
and lower the pump handle to advance the cylinder to the desired
stroke. To retract the cylinder, slowly open the release valve.
On hand pumps with 2-position valves, shift valve to advance
position and raise and lower pump handle to advance. To retract,
shift valve to the retract position.
Problem
Cylinder does not advance,
advances slowly, or
advances in spurts.
Cylinder advances but does
not hold pressure.
Cylinder does not retract,
retracts part way, or retracts
more slowly than normal.
Possible Cause
1. Oil level in pump reservoir is low.
2. Pump release valve open.
3. Loose hydraulic coupler.
4. Air trapped in system.
5. Cylinder plunger binding.
1. Leaking connection.
2. Leaking seals.
3. Internal leakage in pump.
1. Pump release valve closed.
2. Pump reservoir is over-filled.
3. Lose hydraulic coupler
4. Air trapped in system.
5. Hose I.D. too narrow.
6. Cylinder retraction spring broken
or other cylinder damage.
7. Additional tooling on cylinder
too heavy.
Power Pump
Shift the valve to the advance position and run the pump to
advance the cylinder to the desired stroke. To retract the cylinder,
shift the valve to the retract postion and run the pump.
5.2 Air Removal
With the pump positioned higher than the cylinder, advance and
retract the cylinder several times avoiding pressure build-up. Air
removal is complete when cylinder motion is smooth.
6.0 MAINTENANCE
1. Keep all hydraulic components free of dirt, grease, chips, and
unnecessary equipment.
2. Periodically check system for loose connections, leaks,
etc. Replace or repair damaged or leaking components
immediately.
3. Change hydraulic oil in your system as recommended in the
pump instruction sheet.
4. Use only Enerpac hydraulic oil. Use of fluids other than
Enerpac hydraulic oil may cause damage to your system and
will void your Enerpac warranty.
5. For complete hydraulic component instructions. refer to the
instruction enclosed with your pump and cylinder.
6. Periodically check press frame to make sure all bolts are tight
and frame parts are undamaged. Repair or replace damaged
parts immediately.
7.0 TROUBLESHOOTING
Only qualified hydraulic technicians should service the pump or
system components. The following is intended to be used as an
aid in determining if a problem exists. For repair service, contact
an authorized Enerpac Service Center in your area.
1. Add oil to the pump.
2. Close the release valve.
3. Check that all couplers are fully tightened.
4. Remove air according to the instructions in Section 5.0.
5. Check for damage to cylinder. Have cylinder serviced
by a qualified hydraulic technician.
1. Check that all connections are tight and leak free.
2. Locate leak(s) and have equipment serviced by a
qualified hydraulic technician.
3. Have pump serviced by a qualified hydraulic technician.
1. Open release valve.
2. Drain oil level to full mark.
3. Check that all couplers are fully tightened.
4. Remove air according to the instruction in Section 5.0.
5. Use larger diameter hydraulic hose.
6. Have cylinder serviced by a qualified hydraulic
technician.
7. Remove tooling. Check cylinder for damage.
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Solution