Enerpac LW16 User manual

1
POWERFUL SOLUTIONS. GLOBAL FORCE. Hydraulic Vertical Lifting Wedges
Models LW-16 and LWC-16
Instruction Sheet
L4363 Rev. B 03/19 EN
1.0 SAFETY
1.1 Introduction
Read all instructions carefully. Follow all recommended safety
precautions to avoid personal injury as well as damage to the pump
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.
Appropriate training in the safe use of high pressure, high force
hydraulic tools is required prior to the operation of this tool. If
training is needed, contact your local Enerpac distributor or
authorized service center for information about an Enerpac
hydraulic safety training course.
This manual follows a system of safety alert symbols, signal
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 personal 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
WARNING, CAUTION and NOTICE.
WARNING
Indicates a hazardous situation that, if not
avoided, could result in death or serious
personal injury.
CAUTION
Indicates a hazardous situation that, if not
avoided, could result in minor or moderate
personal injury.
NOTICE
Indicates information considered important,
but not hazard related (e.g. messages
relating to property damage). Please note
that the Safety Alert Symbol will not be used
with this signal word.
1.2 Safety Precautions - Hydraulic Vertical Lifting Wedges
WARNING
Failure to observe and comply with the following
precautions and instructions may result in death or serious
personal injury. Property damage could also occur.
• Read and completely understand the safety precautions
and instructions in this manual. Always follow all safety
precautions and instructions, including those that are
contained within the procedures of this manual.
• Follow all instructions and heed all precautions stated in this
manual.
• Keep this manual for future reference in a place that is
accessible to all persons operating or servicing the lifting
wedge.
• Always perform a visual inspection of the lifting wedge
before placing it into operation. If any damage, cracks or
problems are found, do not use the tool. Make repairs before
using the lifting wedge.
• Do not use the lifting wedge if it is leaking oil. Do not use the
lifting wedge if damaged, altered or in need of repair.
• Do not alter the calibration of the safety devices, such as
maximum pressure valves (if equipped).
• Allow only authorized, trained, and experienced personnel to
operate the lifting wedge and supervise its use.
• Ensure that all users are trained and qualified to operate
the lifting wedge. Operators must be aware of all applicable
occupational safety laws and must operate the lifting wedge
in accordance with all such laws.
• Keep the work area clean and well illuminated.
• When operating the lifting wedge, do not wear loose clothing
or jewelry. These items could get caught up in the lifting
wedge during operation. Tie up long hair.
1.0 SAFETY .................................................................... 1
2.0 CONFORMANCE TO NATIONAL AND
INTERNATIONAL STANDARDS................................ 3
3.0 PRODUCT DATA....................................................... 3
4.0 DESCRIPTION.......................................................... 7
5.0 RECEIVING INSTRUCTIONS.................................... 7
6.0 PREPARATION FOR USE......................................... 7
7.0 OPERATION ............................................................. 8
8.0 INSPECTION, MAINTENANCE & STORAGE............ 9
9.0 LUBRICATION ........................................................ 10
10.0 TROUBLESHOOTING .......................................... 10
LWC-16
SB-2
LWB-1
LW-16

2
• Always wear and use appropriate personal protective
equipment (PPE) such as non-skid safety shoes, hard-
hat, hearing protection, and face and eye protection. Use
of these and other PPE items (used as appropriate for the
conditions) will reduce the chance of personal injuries. The
use of these items may also be required by local regulations
or laws.
• Consult your employer concerning specific safety
requirements and the safety equipment required for use in
your country or region.
• Do not exceed equipment ratings. Never attempt to lift a load
weighing more than the capacity of the lifting wedge. Overloading
causes equipment failure and possible personal injury.
• Never set a relief valve to a higher pressure than the
maximum rated pressure of the pump and lifting wedge. If
ratings are dierent, relief valve setting should not exceed
the setting of the lowest rated component (pump or lifting
wedge).
• Keep others clear of the work area while the tool is in use. Be
sure that all personnel not operating the lifting wedge remain
at a safe distance when the lifting wedge is in operation.
• Stop the lifting wedge if people and/or animals enter the
work area.
• Ensure that the operator is alert, observant of the task being
performed and that the work is being done with care.
• Do not allow use of the lifting wedge by persons that are
tired, or under the influence of drugs, alcohol or medication.
• Do not allow children to operate the lifting wedge or to assist.
• Do not use the lifting wedge to lift people. Do not allow
people to be on top of the load during lifting or lowering.
• Be sure setup is stable before lifting load. Lifting wedges
should be located on a firm and level surface capable of
supporting the full load. Do not weld or otherwise modify the
lifting wedge to attach a base or other support.
• Use only Enerpac SB-2 safety block or blocking pieces to
hold loads. Never use a hydraulic lifting wedge as a shim or
spacer in any lifting application.
• Do not use lifting wedge in situations where loads are not
directly centered or placed fully on the lifting wedge. O-
center loads produce considerable strain on lifting wedges.
In addition, the load may slip or fall, causing potential danger.
• Do not use lifting wedge with stepped block in situations
where the stepped block is not positioned fully under the
load.
• Lift only dead weight loads. Avoid lifting live weight loads.
• Be especially careful when lifting loads such as partially filled
storage tanks, in which the center of gravity could move or
shift during lifting. Be aware that the distribution of some
loads can change quickly and without warning.
• Keep all personnel clear of the work area while lifting or
lowering is in progress. To avoid personal injury, keep hands
and feet away from lifting wedge and load during operation.
• Maintain communication with the operator at all times during
lifting or lowering. Use hand signals, two- way radios or
other appropriate forms of communication (as required by
applicable laws and regulations) if the load is not visible to
the operator.
• Operate pump and valve as required to ensure that the load
is lifted and lowered evenly and at a controlled rate.
• Closely watch the load at all times during lifting and lowering.
Stop lifting or lowering immediately if the load becomes
unstable or appears to be lifting or lowering unevenly.
• Stay clear of loads supported only by hydraulics. Follow
the lifted load with the Enerpac SB-2 safety block or use
suitable cribbing.
• Conduct a risk assessment prior to performing any lift.
• Always be certain that hydraulic pressure is fully relieved
and that the load is fully removed from the lifting wedge(s)
before disconnecting hydraulic hoses, loosening hydraulic
fittings, or performing any lifting wedge disassembly or
repair procedures.
• Never allow persons to work under or near the load while the
load is being supported with the Enerpac SB-2 safety block
or hydraulically. After the load has been raised or lowered,
it always must be blocked mechanically with the Enerpac
SB-2 safety block with suitable cribbing.
• When using a hand pump (or a tool with a built-in hand
pump), always keep your body to the side of the pump,
away from the line of force of the pump lever. Keep hands
and fingers away from pinch point areas, such as the pump
lever linkage. Never add extensions to the pump lever.
1.3 Safety Symbols
WARNING
Failure to observe and comply with the safety symbols
axed to the lifting wedge could result in death or serious
personal injury.
Make sure the safety symbols (decals, labels, etc.) are securely
axed to the tool and that they are legible. If not, obtain
replacements from Enerpac. Refer to the tool repair parts
sheet for locations and part numbers. Failure to maintain safety
symbols on tool could result in death or serious personal injury.
The following safety symbols are axed to the lifting wedge:
Crush hazard: Keep hands, fingers and other
body parts away from the lifting wedge during
operation.
Read Instruction Sheet: Read the instruction
sheet before using or servicing equipment.
1.4 Additional Safety Precautions, Model LW-16
WARNING
Failure to observe and comply with the following
precautions and instructions may result in death or serious
personal injury. Property damage could also occur.
• Always read, follow and completely understand all
manufacturer's instructions when operating pumps, valves
and all other devices used with the lifting wedge. Follow all
safety precautions contained in the manufacturer's manuals.
• Use the lifting wedge only with a compatible Enerpac pump.
Use of a non-compatible pump may result in erratic and/or
unsafe operation.
• The lifting wedge is designed for a maximum working
pressure of 10,000 psi [700 bar]. Do not connect the tool
to a pump with a higher pressure rating. Be certain that all
hydraulic hoses and fittings are properly connected and that
they are rated at 10,000 psi [700 bar] or higher.
• Never set a relief valve to a higher pressure than the
maximum rated pressure of the pump and tool. If ratings are
dierent, relief valve setting should not exceed the setting of
the lowest rated component (pump or tool).
• Perform cleaning, maintenance and repair operations only
after disconnecting the tool from the hydraulic pump.
• Wear suitable personal protective equipment (PPE) such
as goggles, gloves and protective clothing when checking
hoses and fittings.
• Do not leave the lifting wedge unattended in the workplace
when it is connected to the hydraulic pump.

3
• Do not expose the lifting wedge to temperatures in excess
of 158°F [70°C]. Allow tool to cool or remove heat source.
• Be aware of hot metal components. Avoid contact with
these components to prevent burns.
• Do not handle pressurized hoses. Escaping oil under
pressure can penetrate the skin. If oil is injected under the
skin, see a doctor immediately.
• Do not pressurize disconnected couplers.
• Never use a hydraulic lifting wedge with uncoupled couplers.
• Do not remove or disable the pump relief valve.
• Install pressure gauge(s) in the system to monitor operating
pressure. It is your window to see what is happening in the
system (LW-16 only).
CAUTION
Failure to observe and comply with the following
precautions could result in minor or moderate personal
injury. Property damage could also occur.
• To help ensure proper operation and best performance, use
only the Enerpac specified hydraulic oil for your Enerpac
product. Use of any other oil may result in unsafe operation
and /or damage to tool. The Enerpac product warranty may
also be invalidated.
• Be careful to avoid damaging hydraulic hoses. Avoid sharp
bends and kinks when routing hydraulic hoses. Do not
exceed the minimum bend radius specified by the hose
manufacturer. 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 hoses. A sharp impact may
cause internal damage to hose wire strands. Applying
pressure to a damaged hose may cause it to rupture.
• Do not lift hydraulic equipment by the hoses or couplers.
Use lifting eye (if equipped) or handle and appropriately
rated lifting equipment.
• Keep hydraulic equipment away from flames and heat.
Excessive heat will soften packings and seals, resulting in
fluid leaks. Heat also weakens hose materials.
• To avoid personal injury keep hands and feet away from
lifting wedge, pressurized hose and load during operation.
NOTICE
Ensure that any repairs are performed only by
trained, qualified and authorized personnel using original
equipment replacement parts. For repair service, contact the
Enerpac Authorized Service Center in your area.
1.5 Additional Safety References
Consult the applicable industry and/or government standards
in your country or region for additional safety precautions and
work rules applicable to hydraulic cylinders, jacks and other
similar lifting equipment.
In the United States, refer to the following documents:
• Code of Federal Regulations - Title 29 Occupational Safety
and Health Standards (U.S. Government Publishing Oce,
732 North Capitol Street, NW, Washington, DC 20401-0001.
www.gpo.gov).
• ASME B30.1 Standards - Jacks (American Society of
Mechanical Engineers, Two Park Avenue, New York, NY
10016-5990. www.asme.org).
In the European Union, refer to the standards and directives
listed in the product's EU Declaration of Incorporation.
2.0 CONFORMANCE TO NATIONAL AND
INTERNATIONAL STANDARDS
Enerpac declares that this product has been
tested and conforms to applicable standards
and is compatible with all CE requirements.
A copy of the product EU Declaration is
enclosed with each shipment.
3.0 PRODUCT DATA
3.1 Specifications
Model No.
Maximum Lifting Height Oil Capacity Weight
(lifting wedge only) (with LWB-1 stepped block✝)
in cm in cm in³ cm³ lbs kg
LW-16 2.02 5.13 2.72 6.91 4.75 78 15.4 7.0
LWC-16 2.02 5.13 2.72 6.91 * * 22.0 10.0
* Reservoir pre-filled with oil at factory. Oil does not need to be added or changed under normal operating conditions.
Refer to Section 6.3 for additional information.
✝LWB-1 stepped block is included with the LWC-16. It is an optional accessory for the LW-16.
Model No.
Maximum Hydraulic
Working Pressure Maximum Lifting Capacity Minimum Access Gap (tip clearance)
Vertical Lift
(each wedge step)
psi bar ton kN in mm in mm
LW-16 10,000 700 16 142 0.39 10 0.83 21
LWC-16 ** ** 16 142 0.39 10 0.83 21
** Maximum pressure internally limited to approximately 10,000 psi [700 bar]. This setting is not user-adjustable.

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3.2 Dimensions, Model LW-16 Lifting Wedge (collapsed position)
A
BCDE
G H
I
J K
L
Item Imperial (in) Metric (mm) Item Imperial (in) Metric (mm)
A3.94 100.0 G 9.72 247.0
B1.20 30.5 H 3.17 80.7
C0.93 23.5 I 2.68 68.0
D0.65 16.5 J 4.33 110.0
E0.39 10.0 K 5.50 140.0
F - - - - L 8.27 210.0
3.3 Dimensions, Model LW-16 Lifting Wedge (extended position)
I
J K
L
ABCDE
F G H
Item Imperial (in) Metric (mm) Item Imperial (in) Metric (mm)
A 4.76 121.0 G 9.72 247.0
B 2.03 51.5 H 3.17 80.7
C 1.75 44.5 I 2.68 68.0
D 1.48 37.5 J 4.33 110.0
E 1.20 30.5 K 5.50 140.0
F 1.77 45.0 L 8.27 210.0

5
3.4 Dimensions, Model LWC-16 Lifting Wedge (collapsed position)
A
BCDE
G H
I
K
J
Item Imperial (in) Metric (mm) Item Imperial (in) Metric (mm)
A 3.94 100.0 G 9.72 247.0
B 1.20 30.5 H 9.97 253.2
C 0.93 23.5 I 4.33 110.0
D 0.65 16.5 J 14.92 378.9
E 0.39 10.0 K 2.68 68.0
F - - - -
3.5 Dimensions, Model LWC-16 Lifting Wedge (extended position)
ABCDE
F G H
I
K
J
Item Imperial (in) Metric (mm) Item Imperial (in) Metric (mm)
A 4.76 121.0 G 9.72 247.0
B 2.03 51.5 H 9.97 253.2
C 1.75 44.5 I 4.33 110.0
D 1.48 37.5 J 14.92 378.9
E 1.20 30.5 K 2.68 68.0
F 1.77 45.0

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3.6 Dimensions, Model SB-2 Safety Block
ABCDE
F
G
H
I
Item Imperial (in) Metric (mm) Item Imperial (in) Metric (mm)
A 2.17 55.0 F 0.79 20.0
B 1.89 48.0 G 4.00 101.6
C 1.61 41.0 H 5.54 140.7
D 1.34 34.0 I 1.50 38.0
E 1.06 27.0
3.7 Dimensions, Model LWB-1 Stepped Block
E
A B
CD
Item Imperial (in) Metric (mm)
A 1.51 38.3
B 1.18 30.0
C 1.26 32.1
D 1.25 31.7
E 2.62 66.5

7
4.0 DESCRIPTION
Enerpac LW Series hydraulic vertical lifting wedges provide
a convenient way to lift large, heavy objects for which floor
clearance is limited.
Two models are available. Model LW-16 features a built-in
single-acting hydraulic cylinder and is powered by an external
hydraulic pump (user supplied).
Model LWC-16 is similar to the LW-16, but contains an integral
hydraulic hand pump for added convenience and portability.
The minimum access gap (clearance between floor and bottom
edge of object) is only 0.39 inch [10 mm] for each LW Series
model.
Maximum lifting capacity of both models is 16 tons [157 kN].
For the LW-16, optional Enerpac AM Series split flow manifolds
allow either 2 or 4 wedges to be used simultaneously to lift
32 or 64 tons [314 or 628 kN] respectively.
The lifting jaw surface of the wedge contains a series of steps.
Any of the steps can be used to support the tool's full rated
load.
The unique interlocking wedge design of the LW Series helps
reduce the possibility of the wedge slipping out from under the
load and also helps prevent bending of the wedge's first step.
A built-in return spring automatically retracts the wedge when
hydraulic pressure is relieved.
5.0 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.
6.0 PREPARATION FOR USE
6.1 Hydraulic Pump Requirements (Model LW-16 only)
The hydraulic pump is sold separately and is not included with
the LW-16 lifting wedge.
To allow precise control of lifting wedge speed and movement,
it is recommended that a hand-operated hydraulic pump be
used with the LW-16.
A powered pump can be used if desired. However, the hydraulic
flow must be carefully regulated so that the load is not raised
too quickly and there are no abrupt movements.
Whichever type of pump is used, be certain that it is rated
at 10,000 psi [700 bar] and is capable of holding a sucient
amount of hydraulic oil to operate the lifting wedge (or set of
lifting wedges) to full extension.
The pump must be designed for use with single acting devices
and must be equipped with a pressure release valve (or suitable
directional control valve). Installation of additional devices in
the circuit may be required to regulate retract and advance
speed.
The pump must also be equipped with a separate safety
pressure relief valve that opens if the system working pressure
exceeds 10,000 psi [700 bar]. Verify that the pump safety relief
valve is adjusted to this setting before using the pump with the
lifting wedges(s).
Always monitor the system hydraulic pressure during
operation. A pressure gauge (user supplied) should be installed
in the line between the pump and the LW-16 lifting wedge. The
installation of multiple pressure gauges is recommended for
systems using more than one lifting wedge.
6.2 Hydraulic Oil Requirements (Model LW-16 only)
Use of Enerpac HF Series ISO 32 hydraulic oil is recommended.
Enerpac hydraulic oil is available at your local Enerpac
Distributor or Authorized Service Center.
NOTICE
• Failure to use the correct oil type may result in damage to
hydraulic components and will void the product warranty.
• Be sure that the oil is clean. The oil cleanliness should
be maintained to a maximum level of 18/16/13 per the
ISO 4406 standard. If the oil develops a milky, cloudy or dark
appearance, it should be changed immediately.
• To avoid overfilling and possible equipment damage, add
oil to the pump reservoir only after all lifting wedges are
completely retracted and system pressure is relieved.
• When using a hand-operated pump, it is permissible to use
a high-quality brand of ISO 15 hydraulic oil. The lower oil
viscosity will result in reduced pumping eort, especially in
cold weather conditions.
6.3 Hydraulic Oil Requirements (Model LWC-16 only)
The hydraulic reservoir of the LWC-16 lifting wedge is pre-filled
at the factory with ISO 15 hydraulic oil. The reservoir should
not require additional oil under normal operating conditions. It
is NOT necessary to periodically check the oil level.
NOTICE
Do not loosen or remove the oil drain/fill plug.
Special procedures are required to properly check the oil level
and to add oil to the bladder style reservoir. If it is suspected
that the oil level is low, take the unit to your Enerpac Authorized
Service Center for inspection.
6.4 Hydraulic Connections (Model LW-16 only)
Model LW-16 is equipped with one Enerpac CR-400 High Flow
female coupler. This 3/8" NPTF coupler provides hydraulic flow
for both advance and retract functions and is compatible with
all Enerpac HC Series hydraulic hoses.
After making connections, be certain that all couplers used in
the system are fully connected, so that hydraulic flow is not
blocked or restricted.
All hoses, fittings and other hydraulic components in the circuit
must be rated for at least 10,000 psi [700 bar] operation.
6.5 Air Removal (Model LW-16)
T rapped air must be purged from the lifting wedge and hose
before placing the system into operation. If multiple lifting wedges
are to be used, it is recommended that air be removed from each
lifting wedge individually. Refer to the following procedure:
1. Position the tool vertically with the lifting wedge pointed
downward. To ensure complete air removal, be sure that the
hydraulic cylinder is positioned lower than the pump reservoir.
2. Close the pump release valve.
3. Operate the hand pump lever until the wedge is fully
extended Then, open the release valve to retract the
wedge. Repeat this process several times, until all air is
removed and operation is smooth. Check that oil reservoir
is full after air purging is completed.
NOTICE
The pump reservoir vent (if equipped) must be
opened before the lifting wedge is advanced. Failure to vent
the system will result in a vacuum and the lifting wedge will not
advance.
6.6 Air Removal (Model LWC-16)
Trapped air must be purged from the internal hydraulic system
before placing the tool into operation. Refer to the following
procedure:
1. Position the tool vertically with the lifting wedge end
pointed downward. Close the release valve (turn release
valve knob in the clockwise direction until hand tight - DO
NOT use tools).
2. Operate the hand pump lever until the wedge is fully
extended. Then, open the release valve to retract the
wedge. Repeat this process several times, until all air is
removed and operation is smooth.

8
7.0 OPERATION
7.1 Hydraulic Pump (Model LW-16 only)
Hydraulic pump operation procedures will vary depending on
pump type, valve configuration and other factors. For detailed
operating instructions and related information, refer to the
instruction sheet included with your pump.
7.2 Setup and Use - Model LW-16
Refer to Figure 1 and other figures as indicated.
3
2
1
4
5
Key
1. Hydraulic Connector
2. Handle
3. Lifting Jaw
4. Driven Wedge
5. Base
Figure 1, LW-16 Major Components
1. Make hydraulic connections. Fully hand-tighten all
couplers. Refer to Section 6.4 for additional information.
2. Ensure the minimum access gap under the item to be
lifted measures 0.39" [10 mm] or greater. Refer to Figure 2.
Figure 2, Minimum Access Gap
Minimum Access Gap
0.39" [10 mm]
3. Lubricate lifting wedge with grease. Refer to instructions in
Section 9.0.
4. Place the lifting wedge under the center of the item to be
lifted. The lifting jaw contains a series of steps. The step to
be used must be fully inserted into the access gap so that
the heel of the step is in contact with the outer surface of
the item to be lifted. Refer to Figure 3.
Figure 3, Inserting Wedge Under Load
OK
OK
5. Close the release valve on the hand pump and advance
the wedge by operating the hand pump lever.
6. When the item has been lifted to the desired height, or to
the maximum height on the step used, insert the Enerpac
SB-2 safety block (included separately with lifting wedge).
Refer to Figure 4.
Enerpac SB-2
Safety Block
Figure 4, Enerpac SB-2 Safety Block
WARNING
Load will be lowered in the next step. Before lowering, be
sure hands, feet and other body parts are not inside the
access gap area. Failure to observe this precaution could
result in serious personal injury.
7. Slowly open the release valve to lower the load until it is
fully supported by the safety block.
8. If the item to be lifted must be raised an additional amount,
insert the wedge under the load using the next highest
wedge step. Then, repeat steps 3 through 7 of this
procedure to raise the load an additional amount.

9
7.3 Setup and Use - Model LWC-16
Refer to Figure 5 and other figures as indicated.
5
3
4
1
6
2
7
Key
1. Lifting Jaw
2. Handle
3. Release Valve
4. Air Vent
5. Hand Pump Lever
6. Base
7. Driven Wedge
Figure 5, LWC-16 Major Components
1. Be sure that the lifting wedge is fully retracted. Close the
release valve (turn release valve knob in the clockwise
direction until hand tight - DO NOT use tools).
2. Be sure the air vent is not obstructed in any way as this will
result in a vacuum within the system and the wedge will
not advance.
3. Ensure the minimum access gap under the item to be
lifted measures 0.39" [10 mm] or greater. Refer to Figure 2.
4. Lubricate the lifting wedge with grease. Refer to
instructions in Section 9.0.
5. Place the lifting wedge under the center of the item to be
lifted. The lifting jaw contains a series of steps. The step to
be used must be fully inserted into the access gap so that
the heel of the step is in contact with the outer surface of
the item to be lifted. Refer to Figure 3.
6. Operate the hand pump lever to advance the lifting wedge.
7. When the item has been lifted to the desired height, or to
the maximum height on the step used, insert the Enerpac
SB-2 safety block (included separately with lifting wedge).
Refer to Figure 4.
WARNING
Load will be lowered in the next step. Before lowering, be
sure hands, feet and other body parts are not inside the
access gap area. Failure to observe this precaution could
result in serious personal injury.
8. Slowly open the release valve to lower the load until it is
fully supported by the safety block.
9. If the item to be lifted must be raised an additional amount,
insert the wedge under the load using the next highest
wedge step. Then, repeat steps 4 through 8 of this
procedure to raise the load an additional amount.
7.4 Enerpac LWB-1 Stepped Block Accessory
The LWB-1 stepped block is useful when lifting items containing
a larger access gap. It allows the item to be lifted higher and
with less penetration.
The stepped block is included with the LWC-16 lifting wedge and
available as an optional accessory for the LW-16 lifting wedge.
WARNING
Failure to observe and comply with the following
instructions could allow the load to become unstable and
shift position. Death and/or serious personal injury could
result if load falls on persons working in the area.
To ensure safe operation:
• The stepped block must protrude under the load at least
0.59" [15 mm].
• The full width of the stepped block must be used.
1
2
Key
1. Countersunk Screw
2. Enerpac LWB-1 Stepped Block
Figure 6, Enerpac LWB-1 Stepped Block
To install the stepped block:
1. Be sure that mating surfaces are clean before beginning
installation.
2. Mount the stepped block on the lifting jaw and secure it with
the countersunk screw, as shown in Figure 6.
8.0 INSPECTION, MAINTENANCE & STORAGE
• Keep the lifting wedge clean. Remove any loose dirt or dust
from exterior surfaces.
• Periodically check the lifting wedge for cracks, wear and damage.
Replace any cracked, worn or damaged parts immediately.
• Periodically check hydraulic components for loose
connections, oil leaks and other obvious problems. Replace
any leaking, worn or damaged components immediately.
• Store the lifting wedge in a clean, dry and secure location.
Keep the stored lifting wedge and hoses (if present) away
from heat and direct sunlight.
• Model LW-16 only:
- To prevent dirt entry, install dust caps on hydraulic
couplers after disconnecting the hydraulic hose from the
lifting wedge.
- Change the pump hydraulic oil at the recommended
interval shown in the pump instruction sheet. Change the
oil immediately if contamination is suspected.
• For repair service, contact an Enerpac Authorized Service
Center. Inspection and repairs should be performed only
by an Enerpac Authorized Service Center or other qualified
hydraulic tool service facility.

10
9.0 LUBRICATION
NOTICE
Use NLGI 2 grease for all grease lubrication
procedures in Sections 9.1 through 9.4.
9.1 Lifting Wedge Lubrication (all models)
Machined surfaces and moving parts should be liberally
coated with grease BEFORE each use. Without lubrication,
binding and galling of lifting wedge components may occur
during the retract stroke, resulting in possible erratic operation
and/or excessive wear.
Use the following procedure to lubricate the lifting wedge.
Refer to Figure 7, items 1, 3, 4, 5 and 6.
1. Remove the grease nipple from its storage location on the
lifting wedge handle.
2. Screw the grease nipple into the upper grease port. Attach
the grease gun and apply grease until grease seeps out.
This will lubricate the mating surfaces of the lifting jaw and
the driven wedge.
3. Remove grease nipple from the upper grease port.
4. Screw the grease nipple into the lower grease port. Attach
the grease gun and apply grease until grease seeps out.
This will lubricate the mating surfaces of the driven wedge
and the base.
5 Remove grease nipple from the lower grease port.
9.2 Alternate Lubrication Method
(all models - if grease gun is not available)
1. Connect hydraulic hose and hand pump to the lifting
wedge (Model LW-16 only).
2. Close the pump release valve.
3. Operate the pump lever to advance the wedge.
4. Smear grease onto the exposed surfaces of the driven
wedge.
5. Open the pump release valve to retract the wedge.
9.3 Guide Pin Lubrication
To lubricate the guide pins:
1. Remove any grit or dirt from the guide pin slots. Refer to
Figure 7, item 2.
2. Smear grease into the guide pin slots.
9.4 Pump Linkage Lubrication (Model LWC-16 only)
Periodically apply grease to the linkage pins so that they remain
lubricated. Refer to Figure 7, item 7.
10.0 TROUBLESHOOTING
Refer to the troubleshooting guide (Table 1 or 2, as applicable)
for a list of possible lifting wedge operational problems, causes
and solutions.
For repair service, contact an Enerpac Authorized Service
Center. Inspection and repairs should be performed only by an
Enerpac Authorized Service Center or other qualified hydraulic
tool service facility.
1
4
5
6
7
2
2
3
Key
1. Upper Grease Port
2. Guide Pin Slots
3. Grease Nipple
(shown in storage location)
4. Lower Grease Port
5. Driven Wedge
6. Lifting Jaw
7. Linkage Pins (LWC-16 Only)
Figure 7, Lubrication, Models LW-16 and LWC-16

11
Table 1 - Troubleshooting Guide, Model LW-16
Problem Possible Cause Solution
1. Lifting wedge will not
advance.
a. Load too heavy for lifting wedge. Reduce load or use a larger capacity lifting device.
b. Pump release valve open. Close pump release valve.
c. Coupler not fully tightened. Tighten coupler.
d. Pump malfunctioning. Repair or replace component(s) as required.
Contact Enerpac Authorized Service Center.
2. Lifting wedge advances
only part way.
a. Low oil level. Add oil to reservoir.
b. Coupler not fully tightened. Tighten coupler.
c. Cylinder plunger binding or
damaged.
Repair or replace component(s) as required. Contact
Enerpac Authorized Service Center.
3. Lifting wedge advances
in spurts.
a. Air in hydraulic system. Purge air from system. Refer to Section 6.5.
b. Cylinder plunger binding or
damaged.
Repair or replace component(s) as required.
Contact Enerpac Authorized Service Center.
4. Lifting wedge advances
slower than normal.
a. Coupler not fully tightened. Tighten coupler.
b. Leaking connection. Repair or replace component(s) as required.
Contact Enerpac Authorized Service Center.
c. Pump malfunctioning. Repair or replace component(s) as required.
Contact Enerpac Authorized Service Center.
5. Lifting wedge advances
but will not hold.
a. Leaking connection. Repair or replace component(s) as required.
Contact Enerpac Authorized Service Center.
b. Cylinder seals leaking. Repair or replace component(s) as required.
Contact Enerpac Authorized Service Center.
c. Pump malfunctioning. Repair or replace component(s) as required.
Contact Enerpac Authorized Service Center.
6. Lifting wedge cylinder
leaks oil.
a. Loose connection. Tighten coupler.
Repair or replace component(s) as required.
Contact Enerpac Authorized Service Center.
b. Cylinder seals worn or damaged. Repair or replace component(s) as required.
Contact Enerpac Authorized Service Center.
c. Cylinder has internal damage. Repair or replace component(s) as required.
Contact Enerpac Authorized Service Center.
7. Lifting wedge will
not retract or retracts
slower than normal.
a. Pump release valve is closed. Open pump release valve.
b. Coupler not fully tightened. Tighten coupler.
c. Pump reservoir overfilled. Drain excess oil from reservoir.
d. Narrow hose restricting flow. Replace hydraulic hose with hose of larger diameter.
e. Broken or weak cylinder retraction
spring.
Repair or replace component(s) as required.
Contact Enerpac Authorized Service Center.
f. Cylinder and/or wedge mechanical
components worn or damaged.
Repair or replace component(s) as required.
Contact Enerpac Authorized Service Center.
8. Oil leaking from external
relief valve.
a. Coupler not fully tightened. Tighten coupler.
b. Restriction in hydraulic hose. Remove restriction.
c. Cylinder has internal damage. Repair or replace component(s) as required.
Contact Enerpac Authorized Service Center.
9. Lifting wedge advances
normally but does not
retract under load.
Driven wedge needs lubrication. Remove lifting wedge from load and lubricate driven
wedge.
10. Lifting jaw is bent. a. Load shift. Reposition load to prevent load shift.
Repair or replace component(s) as required.
Contact Enerpac Authorized Service Center.
b. Load too heavy for lifting wedge. Reduce load or use a larger capacity lifting device.
Repair or replace component(s) as required.
Contact Enerpac Authorized Service Center.
11. Lifting wedge advances
halfway and then stops.
Pump reservoir not vented. Open reservoir air vent.

12
Table 2 - Troubleshooting Guide, Model LWC-16
Problem Possible Cause Solution
1. Lifting wedge will not
advance.
a. Load too heavy for lifting wedge. Reduce load or use a larger capacity lifting device.
b. Pump release valve open. Close pump release valve.
c. Pump malfunctioning. Repair or replace component(s) as required.
Contact Enerpac Authorized Service Center.
2. Lifting wedge advances
only part way.
a. Low oil level. Add oil to reservoir.
b. Coupler not fully tightened. Tighten coupler.
c. Cylinder plunger binding or
damaged.
Repair or replace component(s) as required.
Contact Enerpac Authorized Service Center.
3. Lifting wedge advances
in spurts.
a. Air in hydraulic system. Purge air from system. Refer to Section 6.6.
b. Cylinder plunger binding or
damaged.
Repair or replace component(s) as required.
Contact Enerpac Authorized Service Center.
4. Lifting wedge advances
slower than normal.
Pump malfunctioning. Repair or replace component(s) as required.
Contact Enerpac Authorized Service Center.
5. Lifting wedge advances
but will not hold.
a. Cylinder seals leaking. Repair or replace component(s) as required.
Contact Enerpac Authorized Service Center.
b. Pump malfunctioning. Repair or replace component(s) as required.
Contact Enerpac Authorized Service Center.
6. Lifting wedge cylinder
leaks oil.
a. Worn or damaged seals. Repair or replace component(s) as required.
Contact Enerpac Authorized Service Center.
b. Cylinder has internal damage. Repair or replace component(s) as required.
Contact Enerpac Authorized Service Center.
7. Lifting wedge will
not retract or retracts
slower than normal.
a. Pump release valve is closed. Open pump release valve.
Repair or replace component(s) as required.
Contact Enerpac Authorized Service Center.
b. Broken or weak retraction spring. Repair or replace component(s) as required.
Contact Enerpac Authorized Service Center.
c. Lifting wedge internally damaged. Repair or replace component(s) as required.
Contact Enerpac Authorized Service Center.
8. Lifting wedge advances
but does not retract
under load.
Driven wedge needs lubrication. Remove lifting wedge from load and lubricate
driven wedge.
9. Lifting jaw is bent. a. Load shift. Reposition load to prevent load shift.
Repair or replace component(s) as required.
Contact Enerpac Authorized Service Center.
b. Load too heavy for lifting wedge. Reduce load or use a larger capacity lifting device.
Repair or replace component(s) as required.
Contact Enerpac Authorized Service Center.
10. Lifting wedge advances
halfway and then stops.
Air vent obstructed. Check air vent for obstructions.
Remove obstructions if present.
11. Pressure leaks and
pump lever rises
without assistance.
Internal wear or damage. Repair or replace component(s) as required.
Contact Enerpac Authorized Service Center.

Notes:
13

Notes:
14

Notes:
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