Enerpac LCA-Series - Manual (Page 4)

plate is designed to withstand full clamping capacity.
A jam nut is still required in this case to maintain the
clamping orientation. The jam nut should be installed
on the inside of the fixture plate for most secure
mounting.
3.4 Oil Connection
The cylinder can be plumbed using either the
hydraulic ports on the side of the flange, or the
manifold O-ring ports on the underside of the flange.
The manifold ports can only be used when the
cylinder is flange mounted using the four mounting
bolts as shown in Figure 6.
Hydraulic Fittings
Enerpac link clamps are supplied with either SAE O-
ring ports or BSPP ports in the side of the flange.
Single acting cylinders require only one hydraulic
port. Unlike many other cylinders, single acting
Enerpac link clamps do not require the use of a vent
port. Connect the oil supply to this port using fittings
rated for a minimum of 5000 psi (350 bar) only.
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.
Again, be sure to use fittings and tubing rated for a
minimum of 5000 psi (350 bar) working pressure.
Manifold ports
Enerpac link clamps can also be plumbed using the
manifold ports on the underside of the flange. The
clamps are supplied from the factory with small cap
screw and copper gasket installed in these ports
(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 (Figure 7).
Before installation, the O-rings should be coated with
a small amount of hydraulic oil to prevent damage
during operation. Mount the clamps using the
installation instructions in section 3.3. Remember
that the cylinders must be flange mounted when
using the manifold porting method.
Figure 7
4.0 OPERATION
Enerpac link clamps operate on hydraulic pressure
from 500 to 5000 psi (35-350 bar). This 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 these cylinders. 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
Remove port
screw plug.
Lower flange
Upper flange
O-ring
O-ring
Remove port
screw plug.