Enerpac NSH Series User manual

Document Number: L4489
Document Revision: C
Document Revision Date: 09-AUG-2021
Document Language: English EN
Operation and Maintenance Manual
NSH Cutting Head & NSPH Power Head
Enerpac NSH-Series
To reduce the risk of injury, users must read and understand this document
before use.

L4489_c 1
ABOUT US
Enerpac is a global market leader in high pressure
hydraulic tools, controlled force products, portable
machining, on-site services and solutions for
precise positioning of heavy loads. As a leading
innovator with a 110-year legacy, Enerpac has
helped move and maintain some of the largest
structures on earth. When safety and precision
matters, elite professionals in industries such as
aerospace, infrastructure, manufacturing, mining,
oil & gas and power generation rely on Enerpac for
quality tools, services and solutions. For additional
information, visit www.enerpac.com.
WARRANTY
Refer to the Enerpac Global Warranty document for terms and conditions of the product
warranty. Such warranty information can be found at www.enerpac.com.
NAMEPLATE
www.facebook.com/enerpac
www.youtube.com/enerpac
www.linkedin.com/company/enerpac
www.twitter.com/enerpac
Application Size
Tool Name
Tool Number
Read Owner
Manual Symbol
Warning Alert
Location of Manufacture
Tool Serial
Number
3D Barcode
Compliance Marking
3D Barcode
Location of
Manufacture
Compliance Marking
Tool Number
Tool Name
Warning Alert Read Owner
Manual Symbol
Tool Serial
Number
Pressure Limit
Skin Injection
Hazard Warning

2L4489_c
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L4489 is available in the following languages, visit www.enerpac.com for a copy.
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L4489_c 3
Contents
1. SAFETY ..................................................................................................................... 4
1.1 SAFETY PRECAUTIONS .................................................................................. 4
2. COMPLIANCE STATEMENT(S) ................................................................................ 8
2.1 CONFORMANCE TO NATIONAL AND INTERNATIONAL STANDARDS ....... 8
3. FEATURES & COMPONENTS.................................................................................. 9
3.1 NSPH FEATURES DIAGRAM............................................................................ 9
3.2 NSPH FEATURE DESCRIPTION..................................................................... 10
4. TECHNICAL PRODUCT DATA ............................................................................... 11
4.1 NSPH DIMENSIONAL CALLOUT ART ........................................................... 11
4.2 NSPH DIMENSIONAL TABLE......................................................................... 11
4.3 NUT AND BOLT RANGES ............................................................................... 12
5. OPERATION ............................................................................................................ 13
5.1 ASSEMBLING CUTTING HEAD AND CYLINDER ......................................... 13
5.2 HYDRAULIC PUMP......................................................................................... 13
5.3 HOSE CONNECTIONS.................................................................................... 14
5.4 ADJUSTING BLADE CUTTING DEPTH
(IF BOLT DIAMETER IS SHOWN ON THE SCALE)........................................ 15
5.5 ADJUSTING BLADE CUTTING DEPTH
(IF BOLT DIAMETER IS NOT SHOWN ON THE SCALE) ............................... 15
5.6 NUT SPLITTING PROCEDURE ...................................................................... 16
5.7 IF NUT DOES NOT SPLIT AT FULL HYDRAULIC PRESSURE..................... 18
5.8 AFTER USING THE NUT SPLITTER............................................................... 19
6. STORAGE ................................................................................................................ 19
7. MAINTENANCE ...................................................................................................... 20
7.1 INSPECTION.................................................................................................... 20
7.2 CLEANING ....................................................................................................... 20
7.3 MAINTENANCE ............................................................................................... 20
7.4 CUTTING BLADE REPLACEMENT ................................................................ 21
8. PARTS LIST............................................................................................................. 22
9. TROUBLESHOOTING............................................................................................. 32

4L4489_c
1. Safety
Indicates a hazardous
situation that, if not avoided, will result in
death or serious personal injury.
Indicates a hazardous
situation that, if not avoided, could result in
death or serious personal injury.
Indicates a hazardous
situation that, if not avoided, could result in
minor or moderate personal injury.
Indicates information
considered important, but not hazard
related (e.g. messages related to property
damage). Please note that the Safety Alert
Symbol will not be used with the signal
word.
1.1 Safety Precautions
Failure to observe and comply with the
following precautions could result in
death or serious personal injury. Property
damage could also occur.
• Read and completely understand the
safety precautions and instructions in this
manual before operating the NSPH tools
or preparing them for use. Always follow
all safety precautions and instructions,
including those that are contained within
the procedures of this manual.
• Be sure the operator has completed
safety induction training, specific to the
work surroundings. The operator should
be thoroughly familiar with the controls
and the proper use of the tool.
DANGER
WARNING
CAUTION
NOTICE
WARNING
Read all instructions carefully. Follow all
recommended safety precautions to avoid
personal injury as well as damage to the
product and / or damage to other property.
Enerpac cannot be responsible for any
damage or injury from unsafe use, lack of
maintenance, or incorrect operation. Do not
remove warning labels, tags, or decals. In
the event that any questions or concerns
arise, contact Enerpac or a local Enerpac
distributor for clarification.
Save these instructions for future use.
If you have never been trained on high-
pressure hydraulic safety, consult your
distributor or service center for information
about Enerpac Hydraulic Safety Courses.
This manual follows a system of safety
alert symbols, signals, words, and safety
messages to warn the user of specific
hazards. Failure to comply with these
warnings could result in death or serious
personal injury, as well as damage to the
equipment or other property.
The Safety Alert Symbol appears throughout
this manual. It is used to alert
you to potential physical injury
hazards. Pay close attention to
Safety Alert Symbols and obey
all safety messages that follow this symbol
to avoid the possibility of death or serious
injury.
Safety Alert Symbols are used in conjunction
with certain Signal Words that call attention
to safety messages or property damage
messages and designate a degree or level of
hazard seriousness. The Signal Words used
in this manual are DANGER, WARNING,
CAUTION, and NOTICE.

L4489_c 5
• Wear personal protective gear when
operating hydraulic equipment. Always
wear eye protection. Safety equipment
such as dust mask, non-skid safety
shoes, hard hats, gloves, or hearing
protection (used as appropriate) will
reduce personal injuries. The protective
clothing must not interfere with safe
operation of the tool or restrict the ability
to communicate with co-workers.
• Operating procedures will vary,
depending on the system arrangement.
Always read, follow, and completely
understand all manufacturers’
instructions when operating pumps,
valves and all other devices used with the
NSPH tools. Follow all safety precautions
contained in the manufacturer’s manuals.
Use only for intended purpose.
• To minimize risk of personal injury, keep
hands and feet away from the tool and
workpiece during operation.
• Do not overload equipment.
• Never apply pressure to a damaged
hose, doing so may cause it to rupture.
• Immediately replace worn or damaged
parts. Use only genuine Enerpac parts
from approved distributors or service
centers. Enerpac parts have been
engineered and manufactured to be fit-
for-purpose.
• Do not handle pressurized hoses or
couplings; escaping oil under pressure
can penetrate the skin, causing serious
injury.Seekmedicalattentionimmediately
if oil penetration is suspected.
• Only pressurize complete and fully
connected hydraulic systems. Do
not pressurize systems that contain
unconnected couplers.
• Hydraulic circuit must be at zero pressure
before couplings are disconnected.
• Never leave the system unattended when
under pressure. When the system is
under pressure DO NOT STAND IN LINE
with the direction of force of the NSPH
tools. This is a danger area. Always keep
this area clear of personnel when the
system is under pressure.
• Site pump on a secure, flat, level surface.
Rope off working area and place warning
signs.
• Do not tamper with air pressure relief
safety valve on pump.
• Do not remove gauge covers when fitted.
• Check the date of the calibration
certification. If the recalibration date has
passed, the gauge must be recalibrated.
• If air supply is interrupted, turn off air
stop valve on pump.
• The system operating pressure must not
exceed the pressure rating of the lowest
rated component in the system.
• Maximum allowable pressure for the
NSPH Tool-Series is 10,000 psi [700
bar]. Do not exceed this pressure setting.
• Use only a high-quality non-flammable
solvent for cleaning and degreasing
parts during wrench repair procedures.
To reduce the risk of fire or explosion, do
not use flammable solvents.
• It is advised that a pressure gauge(s)
is installed in the system when using
the NSPH tools to monitor operating
pressure, to allow the operator to monitor
what is happening in the system.
• Care should be taken when using the
lanyard to avoid entanglement with body
parts.

6L4489_c
• Do not strike the nut splitter (or any of
its components) with a hammer or other
objects in an attempt to shock or impact
the nut.
• Do not attempt to move or reposition the
nut splitter while it is in operation.
• Do not apply heat to the nut while the nut
splitter is positioned on the nut.
• Always allow the nut splitter cylinder
to fully retract before disconnecting
hydraulic hose(s). High-pressure fluid
may be ejected from an unretracted
cylinder if a coupler has been damaged
during handling.
• Fully release hydraulic pressure and
disconnect hydraulic hose(s) from nut
splitter cylinder before applying lubricant
to blade or performing any other work
inside the cutting zone.
• Sparks can be emitted at the blade tip
when the nut fractures. To minimize the
risk of sparks or hot metal fragments,
a water spray can be directed over the
entire nut and blade area. However if
there is any doubt as to whether sparks
can be effectively arrested, then the nut
splitter should not be used.
• Never attempt to disconnect or retighten
any part of the hydraulic system while
under pressure. Be sure pressure
gauge indicates zero (0) psi/bar before
attempting to connect, disconnect or
tighten hydraulic fittings.
Failure to observe and comply with
the following precautions could result
in minor or moderate personal injury.
Property damage could also occur.
• Ensure components are protected from
external sources of damage, such as
excessive heat, flame, moving machine
parts, sharp edges, and corrosive
chemicals.
• Take care to avoid sharp bends and kinks
in hydraulic hoses. Bends and kinks can
cause severe back-up pressure and
cause hose failure. Protect hoses from
dropped objects; a sharp impact may
cause internal damage to hose wire
strands. Protect hoses from crush risks,
such as heavy objects or vehicles; crush
damage can cause hose failure.
• Do not lift hydraulic equipment by the
body of the tool, hoses, or couplers. Use
only the designated carrying handle.
• 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.
• Lubricate NSPH tools as directed in
this manual prior to operation. Use only
approved lubricants of high quality,
following the lubricant manufacturer’s
instructions.
• Only use the designated anchor point
for fixing the lanyard. Do not attach the
lanyard to the plastic handle.
CAUTION

L4489_c 7
• Be careful when handling severed nuts.
Sharp edges can cause lacerations.
• Do not cut the nut into small pieces. Use
a maximum of two cuts. The second cut
must always be at 180º (opposite) to the
first.
• Always use the correct size cutting head
for the nut to be cut.
• Do not insert packing pieces or shims
behind the nut or blade in an attempt to
split a nut that is not within the specified
size range for the cutting head.
• Use the nut splitter to cut hexagonal
nuts only. Do not attempt to cut square,
round, bi-hex or 12-point nuts.
• Do not use the nut splitter to cut chains
or bolts.
• Do not use the nut splitter to rotate nuts.
• Do not use the nut splitter’s hydraulic
cylinder for jacking, lifting, pushing or
any other purpose than that for which it
is intended.
Failure to observe and comply with the
following precautions could result in
property damage and/or void the product
warranty.
• Hydraulic equipment must only be
serviced by a qualified hydraulic
technician. For repair service, contact
the Enerpac Authorized Service Centre
in your area.
• It is strongly recommended that
operators always use Enerpac pumps
and hoses.
• Always use Enerpac replacement parts.
• Always follow the inspection and
maintenance instructions contained in
this manual. Perform inspection and
maintenance after use, and at regular
intervals.
• Rope off working area and place warning
signs.
• To help ensure proper operation and
best performance, use of Enerpac oil is
strongly recommended
NOTICE

8L4489_c
2.1 Conformance to National and
International Standards
These tools conform with
the requirements for CE
and UKCA.
•NSPH3 •NSPH4 •NSPH3D •NSPH4D
2. Compliance Statement(s)
Enerpac declares that the product(s) have
been tested and conforms to applicable
standards and the product(s) are compatible
to all EU and UK Requirements.
Copies of the EU Declaration as well as the
UK Self-Declaration are enclosed with each
shipment.

L4489_c 9
3. Features & Components
3.1 NSPH Features Diagram
1
2
3
4
4
5
6
7
1. Cutting Head
2. Blade Cutting Depth Scale
3. Handle
4. Hydraulic Coupler
5. Hydraulic Coupler
(double acting models only)
6. Hydraulic Cylinder
7. Blade Wedge

10 L4489_c
3.2 NSPH Feature Description
The NSPH Series nut splitter is a hydraulically
operated industrial power tool, designed to
quickly remove seized or heavily corroded
nuts from threaded studs.
See section 3.1 for an illustration of the
NSPH nut splitter major features and
components.
A complete nut splitter consists of two
separate sub-assemblies: 1) a single or
double acting hydraulic cylinder and 2)
a matching cutting head designed for
use with a specified nut size range. The
replaceable cutting blade is installed
in a blade carrier mounted on the
shaft of the cylinder sub-assembly.
See Figure 1.
One cutting head is provided with each
nut splitter. If desired, additional cutting
heads for different nut size ranges can be
purchased separately from Enerpac.
Refer to sections 4.1 and 4.2 for nut splitter
specifications and additional information.
Cylinder
Subassembly
Cutting Head
Subassembly
Figure 1: Nut Splitter Sub-assembly

L4489_c 11
4. Technical Product Data
4.1 NSPH Dimensional Callout Art
Notes:
• The NSPH Series is available in both
single and double acting models. Single
acting models use spring force to retract
the blade. Double acting models use
hydraulic force to retract the blade.
• Both single and double acting models
use the same NSPH series cutting
heads.
F
E
D
C
G
B
A
Double Acting Only
Note: A model number ending with “D” indicates double acting.
• A model number containing “D” (e.g.
ND3) indicates that the nut splitter (or
cylinder sub-assembly) is double acting.
4.2 NSPH Dimensional Table
Cylinder
Model
Number
Cutting
Head
Model
Number
Capacity
tons
[kN]
Dimensions
inch
[mm]
Minimum
Pump Oil
Capacity
in3 [cm3]
A B C D E F G
NSPH3
NSPH3D
NSH31 105
[1025]
5.2
[132]
1.1
[28]
7.5
[190]
0.3
[7.0]
3.1
[81]
7.4
[189]
15.9
[404]
33.5
[550.0]
NSH32 105
[1025]
5.7
[145]
1.2
[30]
7.5
[190]
0.6
[15]
3.1
[81]
7.9
[200]
16.5
[419]
33.5
[550.0]
NSH33 105
[1025]
6.3
[160]
1.3
[32]
7.5
[190]
0.4
[11]
3.1
[81]
7.9
[200]
16.8
[427]
33.5
[550.0]
NSH34 105
[1025]
6.8
[174]
1.4
[35]
7.5
[190]
0.4
[11]
3.2
[81]
8.0
[204]
17.2
[438]
33.5
[550.0]
NSPH4
NSPH4D
NSH41 178
[1733]
7.5
[190]
1.4
[36]
9.3
[235]
0.2
[4.5]
4.4
[111]
9.1
[230]
18.5
[470]
67.0
[1100.0]
NSH42 178
[1733]
8.6
[220]
1.4
[36]
9.3
[235]
0.1
[3]
4.4
[111]
9.7
[246]
19.6
[499]
67.0
[1100.0]

12 L4489_c
Cylinder
Model
Number
Cutting
Head Model
Number
Cylinder
Weight lb
[kg]
Head Weight
lb [kg]
Combined
Weight
lb [kg]
Additional
Model Numbers
Cutting Tip
Service Kit
NSPH3
NSPH3D
NSH31 48.5 [22.0] 44.1 [20.0] 92.6 [42.0]
NSPH3CTK
NSH32 48.5 [22.0] 46.3 [21.0] 94.8 [43.0]
NSH33 48.5 [22.0] 48.5 [22.0] 97.0 [44.0]
NSH34 48.5 [22.0] 48.5 [22.0] 97.0 [44.0]
NSPH4
NSPH4D
NSH41 83.8 [38.0] 69.9 [31.7] 153.7 [69.7]
NSPH4CTK
NSH42 83.8 [38.0] 95.9 [43.5] 179.7 [81.5]
4.3 Nut and Bolt Ranges
Cutting
Head Model
Number
A
Bolt Range
inch [mm]
B
Hexagon Nut
Range
inch [mm]
NSH31 1.75 - 2.00
[M45 - M52]
2.75 - 3.13
[70 - 80]
NSH32 1.75 - 2.25
[M45 - M56]
2.75 - 3.50
[70 - 85]
NSH33 1.75 - 2.50
[M45 - M64]
2.75 - 3.88
[70 - 95]
NSH34 1.75 - 2.75
[M45 - M70]
2.75 - 4.25
[70 - 100]
NSH41 2.75 - 3.00
[M76 - M80]
4.25 - 4.63
[110 - 115]
NSH42 2.75 - 3.50
[M76 - M90]
4.25 - 5.38
[110 - 130]
NOTE: Maximum allowable hardness to split is ASTM A194 Gr 2H. Not to be used on
square nuts or stainless steel.
AB

L4489_c 13
5. Operation
5.2 Hydraulic Pump
A 10,000 psi [700 bar] hydraulic pump is
required to operate the nut splitter.
If a single acting nut splitter is used, the
pump must be equipped with a pressure
release valve. If a double acting nut splitter
is used, the pump must be equipped with a
suitable 4-way 3-position directional control
valve.
Always check the pump hydraulic relief valve
setting before connecting the nut splitter.
Maximum pressure must not exceed 10,000
psi [700 bar].
If an air-powered hydraulic pump is used,
an air regulator must be installed in the air
supply line, limiting the air pressure to the
recommended range for the pump being
used.
If the pump is not equipped with a hydraulic
pressure gauge, install a 0-10,000 psi [0-
700 bar] gauge between the pump outlet
and the hydraulic hose.
5.1 Assembling Cutting Head
and Cylinder
The cutting head is shipped disassembled
from the cylinder. Assemble as described in
the following steps:
1. Be sure that cylinder is fully retracted and
disconnected from the hydraulic pump.
2. Loosen the set screw (Figure 2, item A)
located on the cutting head body.
3. Insert the cylinder into the head, aligning
the axial slot in the blade carrier (Figure 2,
item B) with the set screw (Figure 2, item
A) in the cutting head bore. Once aligned,
rotate the cylinder in the direction shown
in order to engage the screw threads.
4. Continue rotating the cylinder until NO
threads are visible on the outside of the
cylinder body (threads fully engaged).
Never use the nut splitter if
any of the cylinder threads are visible.
5. Install the cutting blade. Refer to Section
5.5 for installation instructions.
Figure 2: Assembling the Cylinder and
Cutting Head
WARNING
B
A
A - Set Screw
B - Grooves

14 L4489_c
5.3 Hose Connections
The nut splitter is equipped with an Enerpac
CR-400 3/8” female coupler. Be sure to
use only high pressure hoses and fittings
designed for 10,000 psi [700 bar] operation.
See Figure 3 for typical pump and hose
arrangements.
Single acting nut splitters are equipped with
one Enerpac CR-400 3/8" Female coupler
and one CH604 3/8" Male coupler.
Connect the hydraulic hose(s) between the
pump and the nut splitter cylinder. Check
that couplers on both ends of hose(s)
are fully screwed together. Firmly tighten
couplers by hand to prevent restricted oil
flow.
IMPORTANT: Be sure that all couplers
are fully connected. Loose or partially
connected couplers will block the flow of oil
between the pump and the nut splitter.
To remove any air trapped in the system,
advance and retract the cylinder several
times.
Enerpac PU Series
Electric Pump
0-10,000 psi
[0-700 bar]
Pressure Gauge
Enerpac P Series
Hand Pump
Enerpac PA Series
Air-Hydraulic Pump
Enerpac XA Series
Hydraulic Pump
Note:
Hose arrangement for
single acting nut splitter
models is shown.
Double acting nut splitter
models require TWO
hoses, one for extend and
one for retract.
Figure 3: Hydraulic Connections (typical pumps shown)

L4489_c 15
5.4 Adjusting Blade Cutting
Depth (If bolt diameter is shown
on the scale)
The blade cutting depth scale allows the
user to set the nut splitter’s maximum
stroke, and the corresponding depth of the
cutting blade. This feature helps prevent bolt
damage from occurring due to excessive
blade penetration.
Adjust the cutting depth as described in the
following steps:
1. Ensure that the nut splitter cylinder is
fully retracted.
2. Check that the bolt diameter is within
the range of the cutting head to be used
(bolt diameter range is indicated on the
scale). See Section 4.2 for additional
information.
Note: The cutting depth scale is calibrated
only for the following thread, bolt and nut
types:
Imperial threads-Unified (UN) bolt threads
with heavy series nuts.
Metric threads-Metric (M) bolt threads with
standard series nuts.
If any other thread, bolt or nut type
is present, skip the following steps in
this section and refer to Section 5.5 for
additional instructions.
Figure 4: Blade Cutting Depth Scale
3. If tight, loosen the set screw located on
the cutting head barrel. See Figure 2,
item A.
4. Rotate cutting head until the top of the
blade carrier is aligned with the required
bolt size marker line on the scale. See
Figure 4.
5. Retighten the set screw.
5.5 Adjusting Blade Cutting
Depth (If bolt diameter is NOT
shown on the scale)
1. Measure the distance from the flat of the
nut to the furthest side of the bolt. See
Figure 5.
2. Advance and hold the nut splitter cylinder
at full stroke.
3. If tight, loosen the set screw located in
the barrel portion of the cutting head.
See Figure 2, item A.
Note: Scale markings
will vary depending on
cutting head size.

16 L4489_c
4. Rotate the cutting head until the distance
from the head flat to the tip of the blade
is the same as the nut to bolt distance
previously measured in Step 1 PLUS an
additional 1 to 2 mm (1/16”). See Figure
6.
IMPORTANT: Ensure that the cylinder
threads are not exposed. If the threads are
visible, a larger cutting head and possibly a
larger cylinder is required. Refer to Section
4 for additional information.
5. Retighten the set screw.
6. Retract the nut splitter cylinder.
5.6 Nut Splitting Procedure
1. Verify that the nut splitter cutting head is
the correct size (bolt range) for the nut to
be cut. See Section 4.2.
2. Ensure that the nut splitter blade is in
good condition and that the cutting edge
is not worn, chipped or damaged. Rotate
or replace blade as required.
3. Adjust the blade cutting depth to prevent
damage to the bolt threads. Refer to
sections 5.4 and 5.5 for adjustment
instructions.
4. Connect hydraulic hose(s) as described
in Section 5.3. Check that hydraulic
pump reservoir is filled to the correct
level.
“X” + 1/16" [1-2 mm]
“X” + inch [mm]
Figure 5 Figure 6
✓
A B C
Figure 7: Positioning the Cutting Head

L4489_c 17
5. To help prolong blade life, lubricate the
blade cutting edge and flanks with a
molybdenum disulphide based lubricant
or other high quality lubricant.
Wear gloves when applying
lubricants to prevent contact with skin.
6. Position the cutting head over the nut,
ensuring that the flat surface of the
blade rests against one of the nut flats.
Centrally position the nut within the head
so that the blade will cut in the center of
the nut flat. See Figure 7, view “A”.
7. Ensure that the underside of the cutting
head is seated against the flange, as the
blade must cut as close to the bottom of
the nut as possible. However, if a washer
is present under the nut, position the nut
splitter so that the cutting blade will not
contact the washer. See Figure 8.
IMPORTANT: Improper positioning of
the nut splitter may cause damage to the
cutting blade, blade carrier and piston.
CAUTION
8. Vented pumps only: open the vent/fill
plug or loosen the vent screw to provide
venting.
9. Air or electric powered pumps only:
Set the pump to deliver a nominal
pressure of 1000 psi [69 bar].
To prevent
personal injury, do not
place hands or fingers in
the cutting area.
Do not
move or reposition nut
splitter during operation.
10. Operate the pump to slowly advance the
nut splitter blade until it makes contact
with the nut. Check that the blade is
resting squarely on the nut flat.
WARNING
WARNING
✓
Blade
Washer
Figure 8: Blade Position

18 L4489_c
Notes:
• Air or electric powered pumps only:
Once the blade has stopped cutting at
1000 psi [69 bar], the pressure should be
gradually increased using the pressure
regulator on the pump. Allow adequate
time for the blade to cut before increasing
pressure.
• If pressure is increased too quickly, blade
damage may result. Excessive pressure
may also cause the nut splitter’s internal
relief valve to open, resulting in oil
leakage from the oil bleed hole located
on the underside of the blade carrier.
• On larger nuts, it may be helpful to
periodically retract and re-lubricate
the blade. This will reduce friction and
increase blade efficiency.
11. Continue to apply hydraulic pressure
until the nut is completely severed. As
the nut splits, a loud “crack” will be
heard, indicating that the nut has been
severed.
12. If necessary, a second cut may be
applied, at 180° to the first, completely
severing the nut in half. See Figure 9.
IMPORTANT: Do not cut the nut into
small pieces. Use a maximum of two cuts
and always at 180º (opposite) to the first.
Otherwise, nut metal fragments may be
released.
13. After the cut is completed:
• Single acting models: Release the
pressure to retract the nut splitter blade.
• Double acting models: Move the control
valve to the retract position to retract the
nut splitter blade.
14. Stop the pump. Check that pressure
gauge indicates zero (0) psi/bar.
15. Remove nut splitter from the nut.
16. Remove the severed nut from the stud.
5.7 If Nut Does Not Split at Full
Hydraulic Pressure
If the nut splitter is at full pressure, 10,000
psi [700 bar], and the nut does not split:
Fully release hydraulic
pressure and disconnect hydraulic hose(s)
from nut splitter cylinder before applying
lubricant to blade or performing any other
work inside the cutting zone.
1. Ensure that the blade cutting depth
setting is correct. Also, check that the
cylinder is not at full stroke.
2. If the blade cutting depth setting
is correct and cylinder is not at full
stroke: Release hydraulic pressure and
rotate the cutting head clockwise one
full turn. This will allow the blade to
advance 1 to 2 mm further. Then, re-
apply hydraulic pressure and try again to
split the nut.
3. If step 2 did not work: Release hydraulic
pressure. Re-lubricate the blade and the
groove in the nut where the blade has
penetrated. Then, re-apply pressure,
ensuring that the blade is positioned
back in the same nut groove.
WARNING
Figure 9: Making Two Cuts