Instruction Manual

WARNING: BE SURE SETUP IS STABLE
BEFORE LIFTING LOAD.
Cylinders should be placed on a flat surface that
can support the load. Where applicable, use a cylinder base
for added stability. Do not weld or otherwise modify the
cylinder to attach a base or other support.
Avoid situations where loads are not directly
centered on the cylinder plunger. Off-center loads
produce considerable strain on cylinders and
plungers. In addition, the load may slip or fall, causing
potentially dangerous results.
Distribute the load evenly across the entire saddle
surface. Always use a saddle to protect the plunger.
IMPORTANT: Hydraulic equipment must only be
serviced by a qualified hydraulic technician. For
repair service, contact the Authorized ENERPAC
Service Center in your area. To protect your warranty, use
only ENERPAC oil.
WARNING: Immediately replace worn or damaged
parts by genuine ENERPAC parts. Standard grade
parts will break causing personal injury and
property damage. ENERPAC parts are designed to fit
properly and withstand high loads.
3.0 DESCRIPTION
Spring loaded clamping cylinders use high force internal
springs to clamp and hydraulic pressure to release
clamping. Each clamping cylinder has an oil port for
hydraulic input. The maximum operating pressure of all
MRS-cylinder types is 350 bar. (See Table A.)
The plunger has internal threads for attaching clamp
arms or suitable clamping devices. The cylinder body is
threaded for installing and adjusting in mounting flanges
or fixtures. (See Figure 1.)
4.0 APPLICATION
These cylinders are designed for prolonged clamping
applications in moveable machine parts, tools, fixtures,
pallets and workpieces. To ensure maximum lifetime, it is
advisable to use these cylinders only within their effective
working area. (See Figures 2 and 3.)
The clamping action is instantaneous with the release of
hydraulic pressure. Due to the unique design, these
cylinders provide uninterrupted mechanical clamping
force.
5.0 INSTALLATION
Install the cylinders as close to the work piece as possible
to provide maximum clamping force and minimum stroke
which prolong the lifetime of the cylinder. Use mounting
flanges or suitable fixtures to provide a stable, secure
mounting. Cylinder hydraulic ports can be use to connect
hydraulic hose or pipe. Always use high pressure tubes
and fittings in all applications. Use hydraulic gauges in
each hydraulic system to indicate safe operating
pressures and loads.
CAUTION: To avoid cylinder damage, do not
subject the plunger to severe side loading.
6.0 OPERATION
Available mechanical clamping forces varies from a
maximum level at fully retracted to minimum at fully
extended. (See Figures 2 and 3.)
IMPORTANT: The effective clamping force is influenced by
the tolerances on the work piece to be clamped.
All spring loaded clamping cylinders are reverse single-
acting cylinders using the spring to apply working forces
and hydraulic pressure to release them. Due to the
design, these cylinders provide uninterrupted mechanical
clamping force.
7.0 SERVICE AND MAINTENANCE
Maintenance is required when wear and/or leakage is
noticed. Occasionally inspect components to detect any
problem requiring service and maintenance. ENERPAC
offers ready-to-use spare parts kits for repairs and/or
replacements. Repair parts sheets are available. Contact
your ENERPAC representative.
2
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Figure 1, Example of Installation