Enerpac ST-52 - Manual (Page 2)

2
WARNING: Only use hydraulic cylinders in a coupled system. Never use a cylinder with unconnected
couplers. If the cylinder becomes extremely overloaded, components can fail catastrophically causing
severe personal injury.
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
These swing cylinders are designed to swing 90° in a clockwise or counter-clockwise direction. They can also
be used in straight clamping applications. Single-acting and double-acting swing cylinders are available.
Clamp arms are not supplied with cylinders. Clamp arms can be purchased separately or made according to
the specifications on page 13.
4.0 PRELIMINARY INFORMATION
IMPORTANT: Failure to read and follow these instructions may lead to system malfunction or product
failure, and could invalidate your warranty.
(1) High flow rates can lead to excessive cylinder speed which can cause cylinder damage. Hydraulic
pressure and cylinder speed must be adjusted to match the length of clamp arm. The clamping force
also varies with the length of the clamp arm. Refer to page 2 for operating specifications.
(2) Flow controls with return checks should be used to reduce swing cylinder speed to the
recommended rate. The return checks help minimize back pressure that could lead to an unclamp
malfunction on single-acting systems.
(3) When using single-acting swing cylinders, limit the return flow back pressure to 3,5 bar (50 psi)
maximum. Large diameter tubing (10 mm O.D. or larger) and flow controls with free flow return
checks help minimize back pressure. Consult Enerpac for proper system design.
(4) Excessive return flow back pressure can also damage double-acting swing cylinders. Limit the
return flow back pressure to 42 bar (600 psi) maximum. Double-acting systems should be set up for
a metered-in with reverse free flow in the clamp port.
(5) Clamping of the part should occur at the midpoint of the vertical travel. No clamping of part shall occur
while the swing clamp is turning. Clamp arm should freely travel during the 90° rotation (avoid contact
with cutter heads, tools, etc.).
(6) Attaching clamp arm to cylinder plunger must be done according to the instructions on page 6.
Model Number Code
1 2 3 4 5 6 Optional
S = swing T = threaded body R = right swing S = single-acting 2 = 2,2 kN 2 = metric V = Viton
cylinder U = upper flange L = left swing D = double-acting 5 = 5,6 kN
L = lower flange S = straight
(no swing)