Enerpac LU7-Series - Manual (Page 4)

Double-acting cylinders require two ports to operate.
The port marked “A” should be connected to the
clamp line of the circuit. The port marked “B” should
be connected to the unclamp side of the circuit.
Make sure that fittings, hoses and tubing used are
rated at 70 bar [1000 psi] minimum working pressure.
Manifold Ports
Enerpac link clamps can also be plumbed using
the manifold ports on the underside of the flange.
The clamp is supplied from the factory with a small
cap screw and copper gasket installed in each port.
(Figure 7). Remove these items before installation.
The manifold ports require the use of O-rings as
face seals between the cylinder flange and the
fixture plate. These O-rings are supplied with the
clamp, typically in a small plastic bag along with the
mounting bolts and the documentation. Install these
O-rings (only one O-ring required for single acting
cylinders) into the seal grooves on the underside of
the mounting flange (See Figure 7).
Note: Before installation, the O-rings should be
coated with a small amount of hydraulic oil to prevent
damage during operation.
After installing O-rings, install the clamp as described
in section 3.3 (See Figure 6).
Remove port
screw plug.
Upper Flange
O-ring
Figure 7
4.0 OPERATION
Enerpac link clamps operate on hydraulic pressure
from 10 to 70 bar. The oil pressure is supplied via an
external pump plumbed through a circuit of valves
to the link clamps and other clamping elements on
the fixture. Single acting cylinders only require one
hydraulic line to provide clamping force, and use
an internal spring to retract the clamp arm when
pressure is removed. Double acting cylinders require
two hydraulic lines; one line provides pressure to
advance the arm and clamp the part; the other line
provides pressure to push the arm back and unclamp
the part. Either manual, air or electrically operated
valves are used to direct oil to one port or another.
5.0 MAINTENANCE
1. Use only Enerpac oil with this product. The use of
any other oil may invalidate your warranty.
2. Dynamic hydraulic seals need periodic
replacement due to normal wear and tear. A
regularly scheduled maintenance inspection plan
will help prevent unnecessary interruptions in
production due to seal wear.
3. The clamp linkage can be damaged or broken due
to mis-loaded parts or excessive contamination
build up. Any clips or pins that appear damaged
or worn should be replaced immediately.
4. All maintenance should be done by a qualified
hydraulic service technician. Enerpac has a global
service center network that can provide repair
and maintenance services if needed.
4