Enerpac SU7 User Manual

L3096 Rev. B Date: 12/11

Index:

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Repair Parts Sheets for this product are available
from the Enerpac web site at www.enerpac.com, or
from your nearest Authorized Enerpac Service Center

or Enerpac Sales office.

N/A

1.0 IMPORTANT RECEIVING
INSTRUCTIONS

Visually inspect all components for shipping damage.
Shipping damage is not covered by warranty. If
shipping damage is found, notify carrier at once. The
carrier is responsible for all repair and replacement
costs resulting from damage in shipment.

SAFETY FIRST

2.0 SAFETY ISSUES

Read all instructions, warnings
and cautions carefully. Follow

personal injury or property damage during system
operation. Enerpac cannot be responsible for damage
or injury resulting from unsafe product use, lack of
maintenance or incorrect product and/or system
operation. Contact Enerpac when in doubt as to the
safety precautions and operations. If you have never
been trained on high-pressure hydraulic safety,
consult your distribution or service center for a free
Enerpac Hydraulic safety course.

Failure to comply with the following safety
precautions could cause equipment damage and
personal injury.

A CAUTION is used to indicate correct operating or
maintenance procedures and practices to prevent
damage to, or destruction of equipment or other
property.

A WARNING indicates a potential danger that
requires correct procedures or practices to avoid
personal injury.

A DANGER is only used when your action or lack of
action may cause serious injury or even death.

all safety precautions to avoid

Instruction Sheet

70 Bar Swing Cylinders

2,0 kN, 3,5 kN, 5,0 kN, 7,0 kN, 9.0 kN and 20 kN

WARNING: Wear proper personal

protective gear when operating hydraulic
equipment.

WARNING: Stay clear of loads supported
by hydraulics. A cylinder, when used as a

load lifting device, should never be used as
a load holding device. After the load has been raised
or lowered, it must always be blocked mechanically.

DANGER: To avoid personal injury
keep hands and feet away from cylinder
and workpiece during operation.

WARNING: Do not exceed the product
operating specifications. The cylinders

are designed for a maximum pressure of
70 bar [1000 psi]. Never adjust the circuit pressure
beyond the maximum operating pressure
recommendation for the clamp arm length.
Exceeding these specifications can cause equipment
failure and possible personal injury.

DANGER: Never set the relief valve to a

higher pressure than the maximum rated

pressure of the pump. Higher settings
may result in equipment damage and/or personal
injury. Do not remove relief valve.

WARNING: The system operating
pressure must not exceed the pressure
rating of the lowest rated component in
the system. Install pressure gauges in the

system to monitor operating pressure. It is your
window to what is happening in the system.

CAUTION: Avoid damaging hydraulic
hose. Avoid sharp bends and kinks when
routing hydraulic hoses. Using a bent or

kinked hose will cause severe back-pressure. Sharp
bends and kinks will internally damage the hose
leading to premature hose failure.

Do not drop heavy objects on hose. A
sharp impact may cause internal damage

®

to hose wire strands. Applying pressure to
a damaged hose may cause it to rupture.

IMPORTANT: Do not lift hydraulic
equipment by the hoses or swivel couplers.
Use the carrying handle or other means of
safe transport.

CAUTION: Keep hydraulic equipment
away from flames and heat. Excessive

heat will soften packings and seals,
resulting in fluid leaks. Heat also weakens hose
materials and packings. For optimum performance do
not expose equipment to temperatures of 65 °C [150
°F] or higher. Protect hoses and cylinders from weld
spatter.

DANGER: Do not handle pressurized

hoses. Escaping oil under pressure can

penetrate the skin, causing serious injury.
If oil is injected under the skin, see a doctor
immediately.

3.0 PRODUCT DATA

Table 1 - Model Number Code

1

S =
Swing
Clamp

2

U =
Upper
Flange

3

R =
Right Hand
L =
Left Hand

4

S =
Single Acting
D =
Double Acting

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 with 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.

5678

7=

70 bar

pressure

rating

2 = 2 kN [441 lbs]
3 = 3,5 kN [769 lbs]
5 = 5,0 kN [1111 lbs]
7 = 7,0 kN [1570 lbs]

2 =
Metric

S =
Position

Indicator
Staff

9 = 9,0 kN [2019 lbs]
20 = 20,0 kN [4490 lbs]

Table 2 - Cylinder Specifications

Capacity kN [lbs]

Body Style

Cylinder Type

Hydraulic
Stroke
mm [in]

Effective
Area

2

[in2]

mm

Oil
Capacity

3

cm

[in3]

clamp

total

clamp

unclamp

clamp

unclamp

2 kN

[441 lbs]

Upper

Flange

Single or

Double
Acting

12,0

[0.47]

22,1

[0.87]

3,02

[0.47]

6,16

[0.95]

6,7

[0.41]

13,61
[0.83]

3,5 kN

[769 lbs]

Upper

Flange

Single or

Double
Acting

12,0

[0.47]

22,1

[0.87]

5,28

[0.82]

9,08

[1.41]

11,7

[0.71]

20,07
[1.22]

5 kN

[1111 lbs]

Upper

Flange

Single or

Double

Acting

12,0

[0.47]

22,1

[0.87]

7,54

[1.17]

11,34
[1.76]

16,7

[1.02]

25,06
[1.53]

2

7 kN

[1570 lbs]

Upper

Flange

Single or

Double
Acting

12,0

[0.47]

22,1

[0.87]

10,30
[1.60]

15,21
[2.36]

22,8

[1.39]

33,60
[2.05]

9 kN

[2019 lbs]

Upper

Flange

Single or

Double
Acting

12,0

[0.47]

22,1

[0.87]

13,19
[2.04]

18,10
[2.80]

29,1

[1.78]

39,99
[2.44]

20 kN

[4490 lbs]

Upper

Flange

Single or

Double
Acting

12,0

[0.47]

22,1

[0.87]

30,44
[4.72]

38,48
[5.97]

67,3

[4.10]

85,05
[5.19]

3.1 Clamping Force vs.
Arm Length

Refer to the tables in this section when
selecting the swing cylinder model and
arm length for your application.

IMPORTANT: As the arm length
increases, the maximum allowable
pressure and flow rate decreases.
Exceeding these limits may cause
damage to the product. If the pressure
required for a desired clamping force
and arm length exceeds the specified
limits, select a higher capacity swing
cylinder model.

Table 3 - Clamp Arm Dimensions “M”, “N” and “P”

P

N

(REF)

M

Size

Dimension

“M”

Dimension

“N”

Dimension

“P”

Conversion Information: 1 mm = 0.039 in.

2 kN 3,5 kN 5 kN 7 kN 9 kN 20 kN

See

See

See

Table

Table

25 mm 27 mm 30 mm 37 mm 38 mm 49 mm

M + N M + N M + N M + N M + N M + N

5

4

Table

6

See

Table

7

Table

Table 4 - Clamping Force vs. Arm Length - 2 kN Models

Dimension “M” (See Graphic in Table 3)

Flange Face to Clamping Point - In Millimeters

10* 20 30 40 50 60 70 80 95**

(kN)

Clamp

Force

Pressure

(bar)

70 1,96

65 1,82

60 1,69

55 1,56

45 1,25 1,33

40 1,11 1,20 1,18

35 0,98 1,07 1,02 1,02

30 0,85 0,89 0,85 0,85 0,85

25 0,71 0,76 0,71 0,71 0,71 0,71

20 0,56 0,62 0,58 0,58 0,58 0,58 0,58 0,56

15 0,42 0,44 0,40 0,40 0,40 0,40 0,40 0,40 0,38

10 0,29 0,31 0,27 0,27 0,27 0,27 0,27 0,27 0,27

Maximum
Flow (lpm)

Notes: * CAS-722 standard arm ** CAL-722 long arm

Conversion Information: 1 mm = 0.039 in. 1 kN = 224.82 lbs. 1 bar = 14.5 psi 1 lpm = 61.02 in³/min

Clamp

Force

(kN)

0,41 0,31 0,25 0,21 0,18 0,15 0,14 0,12 0,11

Clamp

Force

(kN)

Clamp

Force

(kN)

Clamp

Force

Clamp

Force

(kN)

(kN)

NOT RECOMMENDED

Clamp

Force

(kN)

Clamp

Force

(kN)

See

See

Table

8

9

Clamp

Force

(kN)

3

Table 5 - Clamping Force vs. Arm Length - 3,5 kN Models

Dimension “M” (See Graphic in Table 3)

Flange Face to Clamping Point - In Millimeters

Pressure

(bar)

Maximum
Flow (lpm)

Notes: * CAS-7352 standard arm ** CAL-7352 long arm

Conversion Information: 1 mm = 0.039 in. 1 kN = 224.82 lbs. 1 bar = 14.5 psi 1 lpm = 61.02 in³/min

23* 30 40 50 60 70 80 90 100 110 120 125**

Clamp

Clamp

Clamp

Clamp

Clamp

Clamp

Clamp

Clamp

Clamp

Force

Force

Force

Force

Force

Force

Force

(kN)

(kN)

(kN)

(kN)

(kN)

(kN)

70 3,42

65 3,20

60 2,94 3,16

55 2,71 2,89

2,22 2,36 2,36 2,36

45

1,96 2,09 2,09 2,09 2,09

40

1,73 1,85 1,78 1,78 1,78 1,78

35

1,47 1,60 1,51 1,51 1,51 1,51 1,51 1,51

30

1,25 1,33 1,25 1,25 1,25 1,25 1,25 1,25 1,25 1,22

25

0,98 1,07 0,98 0,98 0,98 0,98 0,98 0,98 0,98 0,98 0,98 0,96

20

0,73 0,80 0,76 0,76 0,76 0,76 0,76 0,76 0,76 0,71 0,71 0,69

15

0,49 0,53 0,49 0,49 0,49 0,49 0,49 0,49 0,49 0,49 0,49 0,49

10

0,82 0,79 0,73 0,67 0,63 0,59 0,55 0,52 0,50 0,47 0,45 0,44

NOT RECOMMENDED

(kN)

Force

(kN)

Force

(kN)

Clamp

Force

(kN)

Table 6 - Clamping Force vs. Arm Length - 5 kN Models

Dimension “M” (See Graphic in Table 3)

Flange Face to Clamping Point - In Millimeters

Pressure

(bar)

Maximum
Flow (lpm)

Notes: * CAS-7352 standard arm ** CAL-7352 long arm

Conversion Information: 1 mm = 0.039 in. 1 kN = 224.82 lbs. 1 bar = 14.5 psi 1 lpm = 61.02 in³/min

23* 30 40 50 60 70 80 90 100 110 120 125**

Clamp

Clamp

Clamp

Clamp

Clamp

Clamp

Clamp

Clamp

Clamp

Force

Force

Force

Force

Force

Force

Force

(kN)

(kN)

(kN)

(kN)

(kN)

(kN)

70 4,94

65 4,58

60

4,27 4,51

55

3,91 4,14

45 3,20 3,38 3,38

40 2,85 3,02 2,94 2,94

35 2,49 2,67 2,54 2,54

30 2,14 2,27 2,14 2,14

25 1,78 1,87 1,78 1,78

20 1,42 1,51 1,42 1,42

15 1,07 1,11 1,02 1,02

10 0,71 0,76 0,71 0,71

1,31 1,26 1,16 1,08 1,01 0,94 0,89 0,84 0,79 0,75 0,72 0,70

2,94

2,54 2,54

2,14 2,14 2,11

1,78 1,78 1,78 1,73 1,73 1,71

1,42 1,42 1,42 1,42 1,42 1,40 1,38 1,38

1,02 1,02 1,02 1,02 1,00 1,00 0,98 0,98

0,71 0,71 0,71 0,71 0,71 0,71 0,67 0,67

NOT RECOMMENDED

(kN)

Force

(kN)

Force

(kN)

Clamp

Force

(kN)

Clamp

Force

(kN)

Clamp

Force

(kN)

Clamp

Force

(kN)

Clamp

Force

(kN)

4

Table 7 - Clamping Force vs. Arm Length - 7 kN Models

Dimension “M” (See Graphic in Table 3)

Flange Face to Clamping Point - In Millimeters

Pressure

(bar)

Maximum
Flow (lpm)

Notes: * CAS-7792 standard arm ** CAL-7792 long arm

Conversion Information: 1 mm = 0.039 in. 1 kN = 224.82 lbs. 1 bar = 14.5 psi 1 lpm = 61.02 in³/min

18,5* 20 30 40 50 60 70 80 90 100 115**

Clamp

Clamp

Clamp

Clamp

Clamp

Clamp

Clamp

Clamp

Force

Force

(kN)

Force

(kN)

(kN)

70 6,98

65 6,54 6,98

60 6,00 6,18

55 5,52 5,65 5,52

45

40

35

30

25

20

15

10

4,49 4,63 4,45 4,45

4,00 4,14 3,91 3,91 3,91

3,51 3,60 3,38 3,38 3,38 3,34 3,34

3,02 3,11 2,89 2,89 2,89 2,89 2,89 2,85

2,49 2,58 2,36 2,36 2,36 2,34 2,34 2,31 2,31 2,31

2,00 2,05 1,87 1,87 1,87 1,87 1,87 1,87 1,82 1,82 1,78

1,51 1,56 1,42 1,42 1,42 1,42 1,42 1,42 1,42 1,42 1,38

1,00 1,02 0,93 0,93 0,93 0,93 0,93 0,93 0,89 0,89 0,89

1,64 1,62 1,51 1,42 1,35 1,28 1,21 1,16 1,11 1,06 1,04

Force

(kN)

Force

(kN)

Force

Force

(kN)

(kN)

NOT RECOMMENDED

Force

(kN)

Clamp

Force

(kN)

Table 8 - Clamping Force vs. Arm Length - 9 kN Models

Dimension “M” (See Graphic in Table 3)

Flange Face to Clamping Point - In Millimeters

Pressure

(bar)

Maximum
Flow (lpm)

Notes: * CAS-7792 standard arm ** CAL-7792 long arm

Conversion Information: 1 mm = 0.039 in. 1 kN = 224.82 lbs. 1 bar = 14.5 psi 1 lpm = 61.02 in³/min

17,5*

Clamp

Force

(kN)

70 8,98

65 8,38 8,72

60 7,74 8,05

55 7,12 7,38 7,25

45 5,78 6,05 5,87 5,87

40 5,16 5,34 5,12 5,12

35 4,49 4,67 4,49 4,49

30 3,87 4,00 3,83 3,83

25 3,20 3,34 3,16 3,16

20 2,58 2,67 2,49 2,49

15 1,91 2,00 1,87 1,87

10 1,29 1,33 1,25 1,25

2,05 2,02 1,89 1,78 1,68 1,60 1,52 1,45 1,38 1,32 1,27

20 30 40 50 60 70 80 90 100 120**

Clamp

Clamp

Clamp

Clamp

Clamp

Clamp

Clamp

Force

(kN)

Force

(kN)

Force

(kN)

Force

(kN)

Force

(kN)

Force

(kN)

Force

(kN)

Clamp

Force

(kN)

NOT RECOMMENDED

5,12

4,45 4,45 4,45

3,83 3,78 3,78 3,74

3,16 3,11 3,11 3,09 3,07 3,07

2,49 2,49 2,49 2,45 2,45 2,45 2,40

1,87 1,87 1,87 1,82 1,78 1,78 1,73

1,25 1,25 1,25 0,71 1,20 1,20 1,16

Clamp

Force

(kN)

Clamp

Force

(kN)

Clamp

Force

(kN)

Clamp

Force

(kN)

5

Table 9 - Clamping Force vs. Arm Length - 20 kN Models

Dimension “M” (See Graphic in Table 3)

Flange Face to Clamping Point - In Millimeters

Pressure

(bar)

Maximum
Flow (lpm)

Notes: * CAS-7202 standard arm ** CAL-7202 long arm

Conversion Information: 1 mm = 0.039 in. 1 kN = 224.82 lbs. 1 bar = 14.5 psi 1 lpm = 61.02 in³/min

4.0 DESCRIPTION

Enerpac 70 Bar swing cylinders are designed to
swing 90° in a clockwise or counter-clockwise
direction. Single-acting and double-acting models are
available. Clamp arms are not supplied with cylinders.
Clamp arms can be purchased separately or may be
fabricated according to the specifications in Section

10.0 of this manual.

4.1 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 damage the index mechanism.
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 sections 3.0 and 3.1 of this
manual for operating specifications and clamp arm
length information.

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 single­acting 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 [3/8 in.]
O.D. or larger) and flow controls with free flow

19* 20 20 20 20 60 70 80 90 100 120 125**

Clamp

Clamp

Clamp

Clamp

Clamp

Clamp

Clamp

Clamp

Clamp

Force

Force

Force

Force

Force

Force

Force

(kN)

(kN)

(kN)

(kN)

(kN)

(kN)

70 19,97

65 18,64 19,79

60 17,21 18,24

55 15,79 16,72 16,41

45 12,90 13,70 13,30 13,30 13,26

40 11,48 12,19 11,70 11,70 11,70 11,65

35 10,05 10,63 10,10 10,10 10,05 10,05 10,01 10,01

30 8,58 9,12 8,67 8,67 8,67 8,67 8,63 8,63 8,63

25 7,16 7,61 7,16 7,16 7,12 7,12 7,12 7,07 7,03 6,98 6,98

20 5,74 6,09 5,74 5,74 5,74 5,74 5,74 5,69 5,65 5,60 5,60 5,56

15 4,31 4,58 4,27 4,27 4,27 4,23 4,23 4,23 4,23 4,18 4,18 4,14

10 2,85 3,02 2,8 2,80 2,80 2,78 2,76 2,76 2,76 2,76 2,76 2,71

4,10 4,05 3,71 3,42 3,17 2,96 2,77 2,61 2,47 2,33 2,22 2,16

NOT RECOMMENDED

(kN)

Force

(kN)

Force

(kN)

Clamp
Force

(kN)

return checks help minimize back pressure. Consult
Enerpac for proper system design.

4. An excessive retract flow rate can cause damage
to the index mechanism. Double acting systems
should be set up with a metered-in flow control, with
a reverse check used 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 cylinder 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 in Section 6.4.

5.0 MOUNTING SPECIFICATIONS

5.1 Mounting Upper Flange Cylinders

The Enerpac 70 bar swing cylinders feature an upper
flange design. The cylinder can be mounted to the fixture
using the supplied mounting bolts. Oil can be supplied
to the cylinder using either the BSPP hydraulic ports on
the flange or the O-Ring manifold ports on the underside
of the flange. The sections that follow provide detailed
mounting instructions and should be reviewed before
attempting to install the cylinders on the fixture.

WARNING: The fixture must be capable of
withstanding 70 bar [1000 psi] hydraulic

manifold mounted.

working pressure when the cylinders are

Clamp

Force

(kN)

Clamp

Force

(kN)

6

Table 10 - Mounting Dimensions (Refer to Figure 1)

Cylinder

Capacity

2,0 kN [441 lbs] 44,5 M5 x 0,8 x 30 mm long 10

3,5 kN [769 lbs] 50,5 M5 x 0,8 x 30 mm long 11
5,0 kN [1111 lbs] 55,5 M6 x 1,0 x 30 mm long 12 0.47 568-011 13,5-15,0 10.0-11.0
7,0 kN [1570 lbs] 65,5 M6 x 1,0 x 30 mm long 15
9,0 kN [2019 lbs] 88,5 M8 x 1,25 x 30 mm long 15

20,0 kN [4490 lbs] 90,5 M10 x 1,5 x 35 mm long 20 0.79 568-011 47,9-53,1 65.0-72.0

Note: O-rings and mounting bolts included with cylinder.

Fixture
Thread

Ø D3

mm

Mounting Bolt

Thread (J)

Minimum

Mounting

Depth (J2)

Manifold

O-ring

ARP No.

Lubricated Bolt

Torque

mm inch Nm ft-lbs

0.39

0.43

0.59

0.59

568-010 8,0-9,0 5.9-6.6
568-010 8,0-9,0 5.9-6.6

568-011 13,5-15,0 10.0-28.0
568-011 32,0-38,0 23.6-28.0

Mounting Bolts

Manifold

O-Rings

(included)

0,5mm x 45º

ø 4,8mm

63

ø D3

Mtg. Hole

(included)

0.004

J2

J

Figure 1, Cylinder Mounting Details

Before a swing cylinder can be manifold mounted,
the port screw plugs must be removed. The O-Rings
provided should be lubricated and installed in the
counter-bore around the port prior to mounting and
bolting down the swing cylinder.

Be sure that the O-Ring does not get pinched or
damaged during mounting as leakage could result. To
prevent leakage from the manifold mounting, provide
a fixture mounting surface with latness within 0,08 mm
[0.003 inch] and a surface roughness not to exceed
Ra 1,6.

6.0 INSTALLATION

6.1 Port Identification

“Unclamp”

Position

Manifold
Ports

SIDE VIEW

BOTTOM VIEW

“Clamp”

Position

Upper Flange

Port Screw Plug

(remove)

O-Ring

Figure 2, Port Screw Plug Removal

KEY:

A Port: Plunger rotates 90 ° and clamps
B Port: Double-acting -- Plunger unclamps and

rotates -90 °

Single-acting -- Vent Port

Do not remove vent plug except to attach tubing.

(see Section 6.3 for additional information)

Figure 3, Cylinder Port Locations

7

6.2 Hydraulic Connections

To make port connections, install fittings rated for 70
bar [1000 psi].

DO NOT use thread sealant. Sealing is accomplished
by using an O-Ring on the fitting boss. Lubricate the
O-Ring prior to assembly.

When designing your hydraulic circuit, consider
the factors listed in Section 4.1 of this manual.
For additional information about plumbing hydraulic
circuits, refer to the Enerpac Workholding product
catalog.

Table 11 - Cylinder Ports

Cylinder Capacity BSPP Port Size

G ¹

⁄

G ¹

G ¹

G ¼

G ¼

G ¼

8

⁄

8

⁄

8

2,0 kN [441 lbs]

3,5 kN [769 lbs]

5,0 kN [1111 lbs]

7,0 kN [1570 lbs]

9,0 kN [2019 lbs]

20,0 kN [4490 lbs]

6.3 Vent Plug

Single-acting cylinders have a vented plug on the left
side of the cylinder when you are facing the hydraulic
ports. To prevent entry of chips and coolant, the vent
plug must not be removed. If the vent plug is subjected
to a continuous coolant flood condition, attach tubing
to the port using a BSPP fitting, and run the tubing to a

non-contaminated area of the fixture.

6.4 Attaching Clamp Arm

1. Remove the retaining ring from the top of the
plunger.

2. Slide the clamp arm down over the plunger and
use a pliers to push the retaining ring back onto
the plunger groove. Orient the retaining ring so the
retaining ring gap will face the back of the clamp
arm. See Figure 4.

3. Move the clamp arm up until it is firmly against the
retaining ring and in the desired position. While
maintaining this position, torque the clamp arm bolt
to specification shown in Table 12.

Retaining

Clamp Arm

Ring

Plunger

Clamp Arm
Bolt

Figure 4, Attaching Clamp Arm

CAUTION: Inadequate torquing of the
clamp arm bolt could cause the arm to slip

during operation. BE SURE TO USE
QUALITY 12.9 DIN 912 (GRADE 8) SOCKET HEAD CAP
SCREWS (supplied with standard clamp arms).

6.5 Contact Bolt Clearance

When using a contact bolt with upper flange body style
cylinders, you must be certain that the bolt head will
clear the cylinder upper flange during operation. The
clamp arm must be long enough for the bolt head to
clear the upper flange as the arm swings down. Refer to
Figure 5 and Table 13.

“P” Dimension - CAS Series Arm
(see Table 13)

P

Max. Bolt Length
(see Table 13)

Note: Bolt head diameter

must not be larger than

16 mm [0.63 in.]

Figure 5, Contact Bolt Clearance

Table 12 - Clamp Arm Bolt Torque

Cylinder Capacity Bolt Type Torque

2,0 kN [441 lbs] M8 x 1,0 x 20 mm long 32,5-39,0 Nm [24-29 ft-lbs]

3,5 kN [769 lbs] M8 x 1,0 x 25 mm long 32,5-39,0 Nm [24-29 ft-lbs]
5,0 kN [1111 lbs] M8 x 1,0 x 25 mm long 32,5-39,0 Nm [24-29 ft-lbs]
7,0 kN [1570 lbs] M10 x 1,25 x 25 mm long 60,0-72,0 Nm [44-53 ft-lbs]
9,0 kN [2019 lbs] M10 x 1,25 x 25 mm long 60,0-72,0 Nm [44-53 ft-lbs]

20,0 kN [4490 lbs] M12 x 1.25 x 35 mm long 95,5-108,0 Nm [70-80 ft-lbs]

8

Table 13 - Maximum Contact Bolt Length

Cylinder Capacity CAS Series Arm (See Fig. 5)

“P” Dimension

2,0 kN [441 lbs] CAS-722 35,05 mm [1.38 inch] 14,48 mm [0.57 inch]

3,5 kN [769 lbs] CAS-7352 53,09 mm [2.09 inch] (unlimited)
5,0 kN [1111 lbs] CAS-7352 53,09 mm [2.09 inch] (unlimited)
7,0 kN [1570 lbs] CAS-7792 55,63 mm [2.19 inch] 14,48 mm [0.57 inch]
9,0 kN [2019 lbs] CAS-7792 55,63 mm [2.19 inch] 14,48 mm [0.57 inch]

20,0 kN [4490 lbs] CAS-7202 68,07 mm [2.68 inch] 14,48 mm [0.57 inch]

Maximum Contact Bolt Length

(See Fig. 5)

Clearance problems are most common when using the
CAS series standard length arm, with the final clamping
position located at the side of the cylinder. You may
need to use the longer CAL Series clamp arm for these
applications. You can cut CAL series arms to meet your
own requirements, or make your own custom arms, in
accordance with the dimensions shown in Section 10.0
of this manual.

7.0 OPERATION

Swing cylinders rotate 90° during the first portion of
the stroke, continuing without rotation for the final
clamping stroke. The straight downward stroke is the
clamping stroke of the cylinder. Clamping force must
be applied only during the vertical travel, not during
the swing motion.

• To ensure maximum cylinder performance and

• Be sure all items are rated to withstand system

CAUTION: If clamping force is applied

during the rotation portion of the stroke,

internal plunger damage may result.

safety, be sure all hydraulic connections, hoses,
and fittings are properly sealed and fully tightened.

pressures. Under-rated components will not
withstand higher pressure. Using under-rated
components will lead to equipment damage and
possible personal injury.

7.1 Pressure and Flow Rate

The clamp arm length determines the swing cylinder’s
required operating pressure and flow rate.

Set operating pressure and flow rate according to the
recommendations contained in Section 3.1 for your
swing cylinder model.

IMPORTANT: Do not exceed the load-to-length
pressure ratios described in Section 3.1, tables 4
through 9. As the arm length increases, the clamping
force and maximum operating pressure are reduced.

7.2 Position Indicating Staff

Enerpac 70 Bar Swing Cylinders are available with
a positioning indicating staff (optional equipment)
that anchors into the plunger and follows the plunger
movement. The indicating staff is designed for use with
either limit or proximity switches.

A suitable target or flag can be attached using the male
M4 x .07 mm threads on the staff end. See Figure 6.

Clearance below the clamp must be sufficient for the
extended portion of the staff to avoid damage.

CAUTION: It is very important that you use
the correct pressure and flow settings.

damage to the swing cylinder. Damage caused by
exceeding rated pressure and maximum flow is NOT
COVERED BY WARRANTY.

Operating outside these limits will cause

For

“Unclamp”

Detection

For

“Clamp”

Detection

Figure 6, Position Indicating Staff

8.0 MAINTENANCE

Maintenance is required when wear or leakage is
noticed. Periodically inspect all components to detect
any problem requiring service and maintenance.
Enerpac offers ready-to-use repair parts kits. Repair
parts sheets are available with assembly diagrams and
parts lists. Contact Enerpac.

IMPORTANT: Consult the swing cylinder repair parts
sheet for service information about correct assembly
and disassembly. Incorrect maintenance and service
such as wrong torque values may cause product
malfunctions and/or personal injury.

9

9.0 TROUBLESHOOTING

Allow only qualified hydraulic technicians to service the swing cylinder or system components. A system failure
may or may not be the result of a swing cylinder malfunction. To determine the cause of the problem, the
complete system must be included in any diagnostic procedure.

The information in the following chart is intended to be used only as an aid in determining if a problem exists.
For repair service, contact your local Enerpac Authorized Service Center.

Table 13 - Troubleshooting Guide

Problem Possible Cause Solution

a. Pump release valve open. Close pump release valve.

b. No oil in pump reservoir. Fill pump reservoir.

1. Cylinder will not
clamp/unclamp.

2. Cylinder advances part way.

3. Cylinder clamps/unclamps
slower than normal.

4. Cylinder clamps/unclamps
but will not hold pressure.

5. Cylinder leaks oil.

c. Air in system. Remove air from hydraulic system.

d. Couplers not fully tightened. Retighten couplers.

e. Blocked hydraulic line. Check valves, fittings, and tubing.

f. Spring broken in cylinder.
(single-acting models only)

a. Oil level in pump too low. Fill pump reservoir.

b. Plunger binding.

a. Leaking connection or loose fitting. Retighten fittings, couplers and tubing.

b. Restricted hydraulic line. Check valves, fittings and tubing.

c. Pump malfunction. Refer to pump instruction sheet.

a. Seals damaged.

b. Leaking connection. Retighten fittings, couplings and tubing.

c. Pump malfunction. Refer to pump instruction sheet.

a. Seals damaged.

b. Plunger worn or damaged.

Replace spring.

Replace damaged parts - refer to cylinder
repair parts sheet.

Replace seals - refer to cylinder repair parts
sheet.

Replace seals - refer to cylinder repair parts
sheet.

Replace worn or damaged parts - refer to
cylinder repair parts sheet.

6. Clamp arm does not make
swing movement.

a. Clamp arm loose.

b. Plunger worn or damaged.

10

Reposition and tighten clamp arm - refer to
Section 6.4 for instructions.

Replace worn or damaged parts - refer to
cylinder repair parts sheet.

10.0 CLAMP ARM MACHINING SPECIFICATIONS

C

A

H

J

L

V

2.3

U

K

E

B

D

G

3 PLACES

M

F

P

Q

N

125

S

115

R

2 PLACES

T

IMPORTANT: Refer to Section 3.1 to
determine the maximum clamp arm
length and pressure for the desired
clamping force.

Item

A 25 [0.99] 27 [1.06] 30 [1.18] 38 [1.49]

B (Max.) 150 [5.90] 190 [7.48] 190 [7.48] 210 [8.26]

C 30 [1.18] 34 [1.34] 40 [1.57] 48 [1.89]

D 16 [0.63] 16 [0.63] 18 [0.70] 21 [0.82]

E 19,5 [0.77] 20 [0.79] 22 [0.87] 26 [1.02]

F (3 places) 67 [0.26] 84 [3.30] 86 [3.39] 100 [3.94]

G 29 [1.14] 31 [1.22] 34 [1.34] 40 [1.58]

H 12,5 [0.49] 13,5 [0.53] 15 [0.59] 19 [0.74]

J 15 [0.59] 17 [0.67] 20 [0.79] 24 [0.94]

K (Dia.) ø 13,5 [0.53] ø 13,5 [0.53] ø 16,5 [0.65] ø 18,5 [0.73]

L 9 [0.35] 11 [0.43] 11 [0.43] 13 [0.51]

M (Dia.) ø 8,5 [0.33] ø 8,5 [0.33] ø 10,5 [0.41] ø 12,5 [0.49]

N (thread) M8 x 1,25 M8 x 1,25 M10 x 1,5 M12 x 1,25

P 6 [0.23] 8 [0.31] 9 [0.35] 12,75 [0.50]

Q 12 [0.47] 16 [0.63] 18 [0.71] 25,5 [1.00]

R (2 places) 21º - 23º 21º - 23º 21º - 23º 21º - 23º

S (Dia.) ø 22,75 - 23,00

T (Dia.) ø 20 H8 ø 22 H8 ø 25 H8 ø 32 H8

U 3,8 - 4,3 [0.15 - 0.17] 3,8 - 4,3 [0.15 - 0.17] 3,8 - 4,3 [0.15 - 0.17] 4,7 - 5,3 [0.19 - 0.21]

V 1,0 - 2,0 [0.04 - 0.09] 1,0 - 2,0 [0.04 - 0.09] 1,0 - 2,0 [0.04 - 0.09] 1,0 - 2,0 [0.04 - 0.09]

Dimensions in millimeters [inches] unless otherwise noted

2,0 kN 3,5 kN and 5,0 kN 7,0 kN and 9,0 kN 20,0 kN

[0.895 - 0.905]

ø 24,75 - 25,00
[0.974 - 0.984]

ø 27,75 - 28,00
[1.092 - 1.102]

ø 35,50 - 36,00
[1.397 - 1.417]

50
40

11

Enerpac Worldwide Locations e-mail: [e-mail] internet: www.enerpac.com

Australia and New Zealand

Actuant Australia Ltd.
Block V Unit 3
Regents Park Estate
391 Park Road
Regents Park NSW 2143
(P.O. Box 261) Australia
T [phone]
F [phone]
[e-mail]

Brazil

Power Packer do Brasil Ltda.
Rua dos Inocentes, 587
04764-050 - Sao Paulo (SP)
T [phone]
F [phone]
Toll Free: 0800 891 5770
[e-mail]

Canada

Actuant Canada Corporation
6615 Ordan Drive, Unit 14-15
Mississauga, Ontario L5T 1X2
T [phone]
F [phone]
Toll Free:
T [phone]
F [phone]
[e-mail]

China

Actuant (China) Industries Co. Ltd.
No. 6 Nanjing East Road,
Taicang Economic Dep Zone
Jiangsu, China
T [phone]
F [phone]
Toll Free: [phone]
[e-mail]

France, Switzerland, North Africa and
French speaking African countries

ENERPAC
Une division d’ACTUANT France S.A.
ZA de Courtaboeuf
32, avenue de la Baltique
91140 VILLEBON /YVETTE
France
T [phone]
F [phone]
[e-mail]

Germany and Austria

ENERPAC GmbH
P.O. Box 300113
D-40401 Düsseldorf
Willstätterstrasse 13
D-40549 Düsseldorf, Germany
T [phone]
F [phone]
[e-mail]

India

ENERPAC Hydraulics Pvt. Ltd.
No. 1A, Peenya Industrial Area
IInd Phase, Bangalore, 560 058, India
T [phone]
F [phone]
[e-mail]

Italy

ENERPAC S.p.A.
Via Canova 4
20094 Corsico (Milano)
T [phone]
F [phone]
[e-mail]

Japan

Applied Power Japan LTD KK
Besshocho 85-7
Kita-ku, Saitama-shi 331-0821, Japan
T [phone]
F [phone]
[e-mail]

Middle East, Egypt and Libya

ENERPAC Middle East FZE
Oce 423, LOB 15
P.O. Box 18004, Jebel Ali, Dubai
United Arab Emirates
T [phone]
F [phone]
[e-mail]

Russia

Rep. oce Enerpac
Russian Federation
Admirala Makarova Street 8

Moscow, Russia

125212
T [phone]
F [phone]
[e-mail]

Singapore

Actuant Asia Pte Ltd.
83 Joo Koon Circle
Singapore 629109
T [phone]
F [phone]
Toll Free: [phone]
[e-mail]

South Korea

Actuant Korea Ltd.
3Ba 717, Shihwa Industrial Complex
Jungwang-Dong, Shihung-Shi,
Kyunggi-Do
Republic of Korea 429-450
T [phone]
F [phone]
[e-mail]

Spain and Portugal

ENERPAC SPAIN, S.L.
Avda. Los Frailes, 40 – Nave C & D
Pol. Ind. Los Frailes
28814 Daganzo de Arriba
(Madrid) Spain
T [phone]
F [phone]
[e-mail]

Sweden, Denmark, Norway, Finland
and Iceland

Enerpac Scandinavia AB
Fabriksgatan 7
412 50 Gothenburg
Sweden
T [phone]
F [phone]
[e-mail]

The Netherlands, Belgium,
Luxembourg,
Central and Eastern Europe,
Baltic States, Greece, Turkey
and CIS countries

ENERPAC B.V.
Galvanistraat 115
6716 AE Ede
P.O. Box 8097
6710 AB Ede
The Netherlands
T [phone]
F [phone]
[e-mail]

Enerpac Integrated Solutions B.V.

Opaalstraat 44
7554 TS Hengelo
P.O. Box 421
7550 AK Hengelo
The Netherlands
T [phone]
F [phone]
[e-mail]

South Africa and other English
speaking African countries

Enerpac Africa Pty Ltd.
No. 5 Bauhinia Avenue
Cambridge Oce Park
Block E
Highveld Techno Park
Centurion 0157
South Africa
T: [phone]

United Kingdom and Ireland

ENERPAC Ltd.,
Bentley Road South
Darlaston, West Midlands
WS10 8LQ
England
T [phone]
F [phone]
[e-mail]

USA, Latin America and Caribbean

ENERPAC
P.O. Box 3241
Milwaukee WI 53201 USA
T [phone]
F [phone]
User inquiries:
T [phone]
Distributor inquiries/orders:
T [phone]
F [phone]
Technical inquiries:
[e-mail]
[e-mail]

All Enerpac products are guaranteed against
defects in workmanship and materials for as
long as you own them.

For the location of your nearest authorized
Enerpac Service Center, visit us at
www.enerpac.com

101711