Enerpac WFC 72 Manuel D'instructions page 4

b. Turn the second adjustment screw clockwise to increase
the contact force. Turn the second adjustment screw
counter clockwise to decrease the contact force. Note: If
the adjustment screw is backed out too far, the plunger
stroke will be reduced. Refer to specifications table for
the minimum and maximum contact force for each work
support model.
c. Replace the first adjustment screw. Make sure the first
adjustment screw is positioned snug against the second
screw.
2. Place the workpiece into the fixture and above the work
supports. The plunger should be at the approximate middle
of its stroke when contacting the workpiece.
3. Activate hydraulic pressure to lock the work support plunger
into position. The position of the plunger will be maintained
until hydraulic pressure is released.
4. Clamp the workpiece into position to facilitate machining
operations.
5. When machining is complete, release hydraulic pressure from
clamping cylinders first, then release hydraulic pressure from
work supports.
6. Remove the workpiece from the fixture.
5.2 Fluid Advanced Work Supports
1. When no hydraulic pressure is applied, the plunger will be in
the retract position. Place the workpiece into the fixture and
above the work supports. The plunger should be at the
approximate middle of its stroke when contacting the
workpiece.
2. Activate hydraulic pressure to advance the work support
plunger into position. When hydraulic pressure is applied, a
piston pushes against an internal spring that advances the
plunger to the workpiece. As hydraulic pressure increases,
the compression sleeve grips and locks the plunger at the
point of contact. The position of the plunger will be
maintained until hydraulic pressure is released.
3. Clamp the workpiece into position to facilitate machining
operations.
4. When machining is complete, release hydraulic pressure from
clamping cylinders first, then release hydraulic pressure from
work supports.
5. Remove the workpiece from the fixture.
PROBLEM
Plunger will not advance when system pressure
is activated.
The workpiece is experiencing excessive
deflection.
Plunger will not retract.
Plunger will not release to extended height.
Work support leaks oil.
5.3 "Air Spring" Work Supports (WSC 112, 222 only)
1. Set the air regulator to the correct air pressure. The correct
pressure will vary depending on the size of the work support
and the weight of the workpiece.
2. When no air pressure is applied, the plunger will be in the
retract position. Place the workpiece into the fixture and
above the work supports.
3. Shift the handle of the air valve to activate air pressure and
advance the work support plunger into position. The plunger
should be at the approximate middle of its stroke when
contacting the workpiece. If the weight of the workpiece does
not push the plunger down to the correct position, repeat
step 1 and adjust the air pressure appropriately.
4. Activate hydraulic pressure to lock the work support plunger
into position. The position of the plunger will be maintained
until hydraulic pressure is released.
5. Clamp the workpiece into position to facilitate machining
operations.
6. When machining is complete, release hydraulic pressure from
clamping cylinders first, then release hydraulic pressure from
work supports.
7. Remove workpiece from the fixture.
6.0 MAINTENANCE AND SERVICE
Maintenance is required only when wear and/or leakage is
noticed. Occasionally, inspect all components to detect any
problems requiring service and maintenance. Enerpac offers
repair kits for equipment maintenance. Repair parts sheets are
also available. Contact your Enerpac representative.
7.0 TROUBLESHOOTING (see table below)
1. Determine if hydraulic system is exceeding maximum flow rate (see
specifications table).
2. Check for broken take up spring.
3. Check plunger and sleeve for damage.
1. Hydraulic pressure may be below minimum amount to hold plunger.
2. Cutting forces may be exceeding the capacity of the work support.
1. Hydraulic pressure has not been released from the system.
2. Excessive back pressure from small diameter tubing or tight bends.
3. Check plunger and sleeve for damage or for debris accumulation.
4. Check for broken return spring.
1. Check seals for wear or damage.
2. Connection to work supports may be leaking.
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POSSIBLE CAUSE