Enerpac LAT Series User manual

LA-SERIES BOLTING PUMP
INSTRUCTION SHEET
MODEL LA2504TX-QR
LAT-SERIES BOLTING PUMP
INSTRUCTION SHEET
MODEL LA2504TX-QR
EN
L4402 REV. B 05/20

2L4402
TABLE OF CONTENTS
1.0 INTRODUCTION ......................................................................................................................................... 3
2.0 SAFETY ....................................................................................................................................................... 3
3.0 PRODUCT DATA ......................................................................................................................................... 5
4.0 MAJOR FEATURES AND COMPONENTS................................................................................................. 7
5.0 PRODUCT DESCRIPTION.......................................................................................................................... 8
6.0 PREPARATION FOR USE ........................................................................................................................... 8
7.0 OPERATION .............................................................................................................................................. 11
8.0 MAINTENANCE......................................................................................................................................... 13
9.0 TROUBLESHOOTING............................................................................................................................... 17

L4402 .3
1.0 INTRODUCTION
Overview & Application
Enerpac LAT-Series bolting pumps are designed for
use with hydraulic torque wrenches in industrial bolting
applications. Refer to Sections 4.0 and 5.0 of this manual
for additional product information and details. Product
specifications are contained in Section 3.0.
Delivery Instructions
Upon delivery, all components must be inspected for
damage incurred during shipping. If damage is found, the
carrier should be notified at once. Shipping damage is not
covered by the Enerpac warranty.
Warranty
• Enerpac guarantees the product only for the purpose
for which is intended.
• Refer to the Enerpac Global Warranty document for
terms and conditions of the product warranty.
Any misuse or alteration invalidates the warranty.
• Observe all instructions as communicated in this
manual.
• Modification to any part of the equipment described
in this manual should not be attempted.
• When replacement parts are needed, use only
genuine Enerpac replacement parts.
Replacement Parts
Refer to the pump repair parts sheet (RPS), available at
www.enerpac.com, to order replacement parts when
required.
EU Declaration of Conformity
Enerpac Bolting Pump - Model LA2504TX-QR
This tool conforms with the
requirements for CE.
Enerpac declares that the LAT-Series bolting pumps have
been tested and conform to applicable standards and are
compatible with all CE Requirements.
A copy of an EU Declaration of Conformity is enclosed
with each shipment of this product.
ATEX Directive
(Equipment for Potentially Explosive Atmospheres)
Enerpac Bolting Pump - Model LA2504TX-QR
This tool conforms with the
ATEX directive (shown at left).
II 2 GD
ck T4
Enerpac LAT-series bolting pumps are tested and
certified according to the ATEX Directive 2014/34/EU. The
explosion protection is for equipment group II, equipment
category 2 (hazardous area zone 1), in gas and/or dust
atmospheres. Each LAT-Series pump contains the
following markings:
• Ex IIC T4 Gc • Ex IIIC T135°C Dc
2.0 SAFETY
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 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 related to property
damage). Please note that the Safety Alert Symbol will not
be used with the signal word.
2.1 Safety Precautions
WARNING
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 pump or preparing it for use. Always
follow all safety precautions and instructions,
including those that are contained within the
procedures of this manual.
• Refer to the torque wrench instruction manual (from
the torque wrench manufacturer) for important
operation, safety and maintenance instructions
pertaining specifically to the torque wrench.
• Be sure the operator has completed safety induction
training, specific to the work surroundings. The
operator should be thoroughly familiar with the pump
and the proper use of the torque wrench.

4L4402
CAUTION
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 hoses or
couplers. Use only the designated carrying handles
or lifting points.
• Inspect the pump prior to operation. Repair or
replace any worn, damaged or leaking components.
• When performing lubrication and maintenance
procedures, use only approved lubricants of high
quality, following the lubricant manufacturer’s
instructions.
NOTICE
• Hydraulic equipment must only be serviced by a
qualified hydraulic technician. For repair service,
contact the Enerpac Authorized Service Center in
your area.
• To help ensure proper operation and best
performance, use only Enerpac HF hydraulic oil.
Use of other oils may result in damage to pump
components and may void the Enerpac product
warranty.
2.2 Safe Disposal Procedures
When the pump has reached the end of its useful life,
dispose of it as described in the following steps:
1. Shut-o air supply to pump.
2. Be certain that all hydraulic and air pressure is
completely relieved.
3. Disconnect compressed air supply line and hydraulic
hoses from pump.
4. Drain all oil from hydraulic reservoir. Dispose of oil in
accordance with all applicable laws and regulations.
5. Take the pump to an approved industrial recycling
facility for disposal.
• Ensure all hydraulic components (torque wrench,
hoses, fittings, couplers, etc.) are rated to a safe
working pressure of 10,000psi [690bar].
• Do not overload equipment.
• Never attempt to remove or readjust the pump’s
internal safety pressure relief valve. Valve is factory
set.
• Position the pump on a secure, flat and level surface.
• Rope o working area and place warning signs.
• If air supply to pump is interrupted, turn o pump air
shut-o valve.
• Do not use combustible gases to drive the pump air
motor.
• Wear hearing protection. Sound level from air motor
may exceed 85 db(A).
• Wear personal protective equipment (PPE) 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.
• Do not used worn or damaged hoses. Applying
pressure to a worn or damaged hose 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 for proper fit and function and safe
operation.
• To minimize risk of personal injury keep hands and
feet away from the wrench and work area during
operation.
• Do not handle pressurized hoses; escaping oil under
pressure can penetrate the skin, causing serious
injury. Seek medical attention immediately if oil
penetration is suspected.
• Only pressurize complete and fully connected
hydraulic systems. Do not pressurize systems that
contain unconnected couplers.
• Do not remove gauge covers (if equipped).
• On pumps with user-calibrated gauges, check the
date of the calibration certification. If the recalibration
date has passed, the gauge must be recalibrated.
• Be certain that hydraulic circuit is at zero (0) pressure
before couplers are disconnected.

L4402 .5
3.0 PRODUCT DATA
3.1 Specifications - Model LA2504TX-QR
Control Valve
Type Motor Type Hydraulic Hose Connections
*Air Inlet
Connection Oil Type
Usable Oil
Capacity **
Weight
(with oil)
gal l lb kg
4-Way, 2-Position
Torque Wrench
Air
(pneumatic)
Enerpac Spin-On hydraulic
couplers (1 male, 1 female)
1/2" NPTF
(.500-14) Enerpac HF 0.5 1.9 39.6 18.0
*Enerpac Spin-On hydraulic couplers are included with pump. Pump hydraulic port thread size is 1/4” NPTF.
** Approximate usable oil capacity of pump hydraulic reservoir. Pump total oil capacity (including reservoir and pump element housing) is
approximately 0.8 gallons [3.0 liters].
Pump Type
Maximum Hydraulic
Working Pressure*
Hydraulic Flow Rate (typical) User-Adjustable
Relief Valve Range
At 10.0 psi [0.6 bar]
Hyd. pressure
At 10,000 psi [690 bar]
Hyd. pressure
psi bar in³/min l/min in³/min l/min psi bar
2-Stage 10,000 690 214 3.5 25 0.4 2000-10,000 138-690
*Maximum pressure setting of pump is limited to approximately 10,300-10,800 psi [710-745 bar] by an internal safety relief valve.
Air Motor
Rating
Dynamic Air Pressure Range
(at air inlet connection)
Air Consumption
(max)
Operating
Temperature Range*
Sound
Level
Lwa**
hp kW (min) (max) scfm l/min ˚F ˚C dB
psi bar psi bar
1.7 1.3 65 4.5 100 6.9 65 1389 -19 to +122 -28 to +50 87-90
*At 85% relative humidity.
** Typical. Actual sound level will vary depending on pump speed and load.
3.2 Performance Curves - Model LA2504TX-QR
FLOW vs.PRESSURE
0
25
50
75
100
125
150
175
200
225
250
0 2000 4000 6000 8000 10,000
Oil flow (in3/min) ▶
Pressure (psi) ▶
(IMPERIAL)
FLOW vs.PRESSURE
0
0.5
1
1.5
2
2.5
3
3.5
4
0 100 200 300 400 500 600 700
Oil flow (l/min) ▶
Pressure(bar) ▶
(METRIC)
Note: Curves based on 100 psi [6.8 bar] dynamic air pressure @ 65 scfm [1389 l/min.]

6L4402
3.3 External Dimensions - Model LA2504TX-QR
Item Dimension
B
D
A
C
inch mm
A17.1 435
B9.8 250
C14.8 375
ft m
D
(pendant
cable)
15.0 4.5

L4402 .7
4.0 MAJOR FEATURES AND COMPONENTS
Key:
1. Hydraulic Pressure Gauge
2. Roll Cage
3. Hydraulic Hose Port B
4. Oil Sight Glass (top)
5. Oil Sight Glass (bottom)
6. Oil Drain Plug
7. Hydraulic Hose Port A
8. Hyd. Relief Valve (user-adjustable)
9. Hydraulic Reservoir
10. Oil Fill Plug
11. Air Motor Control Valve
12. Carrying/Transport Handle
13. Air Lubricator
14. Air Filter/Regulator
15. Air Pressure Gauge
16. Air Inlet Connection (1/2" NPTF)
17. Hydraulic Reservoir Air Breather
18. Air Motor
19. Air Muer
20. Hydraulic Control Valve
21. Remote Pendant and Cable
1
13
14
16
20
17
18
21
19
3
5
4
6
10
11
87
9
2
12
15
Figure 1: Major Features and Components - LAT-Series Bolting Pump

8L4402
5.0 PRODUCT DESCRIPTION
5.1 Introduction
The Enerpac LAT-Series air-powered bolting pump is
designed for use with hydraulic torque wrenches rated at
10,000 psi [690 bar] maximum operating pressure.
Features include:
• 2-button remote pendant with 15 ft [4.5 m] cord.
• Powerful 1.7 HP [1.3 kW] air motor.
• Durable and lightweight chassis construction with
aluminium hydraulic reservoir.
• Two-stage pump design for fast system fills and
controlled flow at high pressures.
• Three discreet piston blocks provide even oil flow
and smooth operation.
• Integral roll cage and carrying handle.
• Built-in air filter/regulator/lubricator assembly.
• 10,000 psi [690 bar] dial type hydraulic pressure
gauge
• User-adjustable pressure relief valve allows quick
adjustment of torque wrench force.
The pump is capable of developing 10,000 [690 bar] psi
with input air pressure of 65 psi [4.5 bar] and dynamic air
flow of 65 scfm [1389 l/min].
See Figure 1 for a diagram of the pump’s major features
and components.
6.0 PREPARATION FOR USE
6.1 Reservoir Air Breather
The reservoir air breather parts are included separately in
the shipment. They must be installed prior to pump use as
described in the following steps. See Figure 2.
1. Remove the metal shipping plug (A) from the reservoir
cover plate (save for future use).
2. Install adapter fitting (B) reducer fitting (C) and air
breather (D). Tighten breather by hand to prevent
damage.
A
B
C
D
Figure 2: Hydraulic Reservoir Air Breather Installation
6.2 Reservoir Oil Level
The hydraulic reservoir is pre filled with oil at the factory.
However, the oil level should always be checked as a
precaution before running the pump. See Figure 3 and
refer to the following steps:
1. If previously connected, be certain that air supply
is shut o. Verify that air pressure gauge on filter/
regulator indicates zero (0) psi/bar. Be sure that the
hydraulic pressure gauge indicates zero (0) psi/bar.
2. With the pump on a level surface, check the oil level.
The reservoir is full when the oil level is up to - but
not above - the top oil level sight glass.
3. If oil level is low, loosen and remove the reservoir oil
fill plug. Slowly add additional hydraulic oil until the
oil level is up to - but not above - the oil level sight
glass. DO NOT OVERFILL
NOTICE
For optimum performance and to prevent
possible invalidation of the product warranty, use only
Enerpac HF hydraulic oil.
4. Reinstall the reservoir oil fill plug.
5. Additional oil may need to be added after wrench
and hoses are connected and pump is run. Always
check oil level with pump o and hydraulic pressure
relieved.
FULL
ADD OILADD OIL
Figure 3: Hydraulic Reservoir Oil Level

L4402 .9
6.3 Compressed Air Connection
A 1/2" NPTF connector is located on the pump roll
cage frame, near the air filter/regulator. Connect the
compressed air supply line to this connector. See
Figure 4.
100 psi dynamic air pressure @ 65 scfm air flow
[6.9 bar @ 1389 l/min] is required to operate the pump at
its maximum working pressure of 10,000 psi [690 bar].
With the pump not running, adjust the air pressure setting
using the control knob at the top of the regulator. Pull
up on the knob to allow adjustment. Push down on the
knob to lock the setting. A gauge located on the regulator
housing indicates air pressure. See Figure 6.
Refer to the air filter/regulator manufacturer’s instructions
for additional information.
1/2" NPTF
Figure 4: Air Inlet Connection
• Do not expose the air filter/regulator or air lubricator
bowls to materials such as carbon tetrachloride,
trichloroethylene, acetones, paint thinner or cleaning
fluids which will cause the plastic to craze or rupture.
• Consult the air filter/regulator manufacturer for
additional information if you are uncertain if
substances present in the work environment will be
harmful to these components.
6.5 Connecting Hydraulic Hoses
Couplers must be polarized per the diagram in Figure
5for correct wrench operation. All hoses, fittings and
components used with the pump must be rated for at
least 10,000 psi [690 bar] operation.
WARNING Avoid kinking or tightly bending hoses. Do
not exceed the hose manufacturer’s stated minimum
bend radius. If a hose becomes kinked or otherwise
damaged, it must be replaced. Damaged hoses may
rupture at high pressure. Serious personal injury may
result.
1. To prevent the pump from starting, be sure that the
compressed air supply is shut o. Pressure gauge on
air filter/regulator must indicate zero (0) psi/bar.
2. Verify that pump hydraulic pressure gauge indicates
zero (0) psi/bar. If any pressure is indicated, relieve
pressure as described in Section 7.3 of this manual.
WARNING Attempting to couple a hydraulic hose to
the pump or torque wrench while coupler is under pressure
may result in personal injury and/or fluid leakage.
NOTICE
The pump is supplied with coupler halves pre-
installed in the pump hydraulic ports. These coupler
halves are compatible with Enerpac THQ Series torque
wrench hoses.
3. Remove dust caps from pump couplers “A” and “B”.
4. Connect the hose from the advance side of the
torque wrench to pump coupler “A”. Hand tighten the
collar on the female coupler until it is fully threaded
onto the male collar.
5. Connect the hose from the retract side of the torque
wrench to pump coupler “B”. Hand tighten the collar
on the female coupler until it is fully threaded onto
the male collar.
WARNING
At each hose connection, be certain that
the male and female coupler halves are fully engaged and
threaded together. There should be no threads visible at
the couplers. Partial coupler engagement can prevent
B
A
B
A
Advance
Retract
Pump
Torque Wrench
Figure 5: Hydraulic Hose Connections (typical)
6.4 Filter Regulator and Air Lubricator Precautions
CAUTION Failure to follow the following precautions
and instructions could allow the filter/regulator and/or air
lubricator bowl to rupture. Minor or moderate personal
injury could result:
• The filter regulator and air lubricator bowls are
made of polycarbonate. Synthetic base oils or
oils containing phosphate esters or chlorinated
hydrocarbons will attack polycarbonate bowls and
can result in a rupture of the bowl. Do not connect
the pump to a compressed air system which uses
these oils.

10 L4402
proper wrench operation and may result in high pressure
oil leakage and/or detachment of the hose under pressure.
Skin penetration and serious personal injury could occur.
6. When a torque wrench is first connected to the pump,
air may be trapped in the hydraulic circuit. Refer to
Section 7.4 for air removal procedure.
6.6 Air Lubricator - Checking Lubricant Level
The air lubricator provides lubrication for the pump’s air
motor. It is filled at the factory prior to shipment. However,
as a precaution, check the lubricant oil level before start-
up. See Figure 6.
The recommended air lubricant is a petroleum based oil of
100 to 200 SUS viscosity at 100°F. [38°C] and an aniline
point greater than 200°F [93°C].
NOTICE
To prevent damage to the air lubricator, DO
NOT use oils with additives, compounded oils containing
solvents, graphite, detergents or synthetic oils.
If lubricant level is low, add oil as described in the following
steps:
1. Shut o the compressed air supply.
2. Remove the fill plug from the top housing of the
lubricator.
3. Slowly add lubricant as required, until the lubricant
level is up to the MAX OIL mark. To prevent spillage,
use a funnel or a bottle with a long spout. Fully insert
end of spout or funnel into the recessed area of the
lubricator fill port.
4. Reinstall the fill plug after adding lubricant.
Refer to lubricator manufacturer’s instructions for
additional information.
NOTICE
The air lubricator must be periodically refilled
with the proper lubricant. Maintaining the lubricator oil
level is critical to the life of the air motor. Premature air
motor wear will occur if pump is operated while lubricator
oil level is low (below the MIN OIL mark). To ensure proper
lubrication, be sure to also adjust the air lubricator drip
rate, as described in the following section of this manual.
6.7 Air Lubricator - Oil Drip Rate Adjustment
The air lubricator drip rate must be adjusted before pump
start-up. See Figure 6
To make an initial adjustment:
1. Be sure that torque wrench is NOT mounted on a nut
or bolt.
2. Turn on the compressed air supply.
3. Press and release the green ON/ADV button on the
pendant to start the pump.
4. While the pump is running, adjust the user-adjustable
relief valve so that the pressure gauge indicates zero
(0) psi/bar.
5. As the pump continues running, look for oil drops
inside the lubricator sight dome (located just below
the drip rate adjustment knob).
6. Set the oil drip rate to one or two drops per minute.
Turn the adjustment knob counter-clockwise to
increase the drip rate and clockwise to decrease it.
7. Re-check the oil drip rate after the system has been
in use and reaches its normal operating temperature.
Readjust the drip rate if needed.
Refer to air lubricator manufacturer’s instructions for
additional information.
MAX
OIL
MIN
OIL
LEVEL
MAX
2
7
6
5
3
4
1
MAX
OIL
MIN
OIL
LEVEL
MAX
P
U
S
H
T
O
L
O
C
K
2
7
65
3
4
1
2
3
1
MAX
OIL
MIN
OIL
LEVEL
MAX
2
3
1
MAX
OIL
MIN
OIL
LEVEL
MAX
2
7
6
5
3
4
1
MAX
OIL
MIN
OIL
LEVEL
MAX
P
U
S
H
T
O
L
O
C
K
2
7
65
3
4
1
2
3
1
MAX
OIL
MIN
OIL
LEVEL
MAX
2
3
1
Key:
1. Air Pressure Knob
2. Lubricator Oil Drip Adj.
3. Lubricator Sight Dome
4. Fill Plug, Air Lubricator
5. Air Lubricator Bowl
6. Air Filter Bowl
(also see Figure 17)
7. Air Pressure Gauge
MAX
OIL
MIN
OIL
LEVEL
MAX
2
7
6
5
3
4
1
MAX
OIL
MIN
OIL
LEVEL
MAX
P
U
S
H
T
O
L
O
C
K
2
7
65
3
4
1
2
3
1
MAX
OIL
MIN
OIL
LEVEL
MAX
2
3
1
MAX
OIL
MIN
OIL
LEVEL
MAX
2
7
6
5
3
4
1
MAX
OIL
MIN
OIL
LEVEL
MAX
P
U
S
H
T
O
L
O
C
K
2
7
65
3
4
1
2
3
1
MAX
OIL
MIN
OIL
LEVEL
MAX
2
3
1
Figure 6: Air Filter/Regulator and Air Lubricator

L4402 .11
NOTICE
To check for proper air lubrication levels, hold
a mirror near the pump air muer exhaust outlets. If a
heavy oil film develops, reduce the drip rate as required.
7.0 OPERATION
7.1 Pre Start-up Checklist
• Check all hydraulic system fittings and connections
to be sure they are tight and leak free.
• Check oil level in hydraulic reservoir. Refer to
Section 6.2 for instructions.
• Be certain that pump is connected to the air supply
line and that compressed air system is turned on.
• Before using the pump and torque wrench on a
nut or bolt, remove air from hydraulic lines and
components as described in Section 7.4. Then, set
the maximum pressure required for your bolting
application and the torque wrench being used. Refer
to instructions in Section 7.5.
NOTICE
Perform air removal and pressure (torque)
adjustment at initial start-up and whenever a dierent
torque wrench is connected to the pump.
• Refer to the torque wrench manufacturer’s
instructions for important safety, operation and
maintenance instructions applicable to the wrench
being used with the pump.
7.2 Operating Instructions
The pump is operated by a two-button remote control
pendant. See Figure 7.
• Press and hold the green ON/ADV button to start
the pump and advance the wrench. The button must
remain pressed to advance the wrench.
• Release the green ON/ADV button to retract the
wrench. The pump will continue running.
• Press the red OFF button to stop the pump.
7.3 Relieving Hydraulic Pressure
To fully relieve hydraulic pressure using the pendant:
• Press and hold the red OFF button while pressing
and releasing the green ON/ADV button several
times. See Figure 8.
• Verify that the hydraulic pressure gauge indicates
zero (0) psi/bar. Then, release the red OFF button.
NOTICE
Air pressure must be present at the pump air
inlet connection to relieve hydraulic pressure using the
pendant.
If compressed air supply is disconnected or not
functioning, and trapped hydraulic pressure is present:
• Relieve hydraulic pressure manually by turning
the user-adjustable relief valve counter-clockwise
until pressure is relieved. Refer to Section 7.5 for
additional information.
• Verify that the hydraulic pressure gauge indicates
zero (0) psi/bar.
ON / ADV
OFF
• Press and hold to
start pump and
advance wrench.
• Release to retract
wrench.
• Press to stop
pump.
GREEN BUTTON
RED BUTTON
Figure 7: Starting and Stopping Pump
2. While holding red button,
press and release green
button several times.
3. Verify that hydraulic
pressure is completely
relieved.
0 psi/bar
ON / ADV
OFF
1. Press and hold
red button.
▲
Figure 8: Relieving Hydraulic Pressure

12 L4402
7.4 Removing Air from Hydraulic System
When the torque wrench is first connected to the pump,
or after a dierent torque wrench is connected, air may
become trapped in the hoses and components.
To ensure smooth and safe operation, remove air by
cycling the torque wrench several times without load.
Continue until the wrench advances and retracts without
hesitation.
During this procedure, position the pump slightly higher
than the torque wrench to facilitate air removal.
7.5 Maximum Pressure (Torque) Adjustment
WARNING Make pressure adjustments BEFORE
placing torque wrench on nut or bolt head. The pump
pressure setting may need to be adjusted slightly above
the calculated pressure needed to provide the required
torque for your application. However, significantly
exceeding the required torque will cause equipment
damage and may result in serious personal injury.
NOTICE
Refer to torque wrench manufacturer’s
instructions for wrench set-up and operation procedures.
The pump is equipped with a user-adjustable relief valve
that is used to set the pump maximum hydraulic pressure
and the corresponding amount of torque applied to the
nut or bolt by the torque wrench.
Adjust this setting as described in the following steps. See
Figure 9 for relief valve details.
1. Loosen the relief valve locknut.
2. On the remote pendant, press and hold the green
ON/ADV button to start the pump. Observe the
hydraulic pressure gauge reading.
3. While continuing to press and hold the green ON/
ADV button:
• Slowly turn relief valve adjustment knob clockwise to
increase pressure to the desired amount.
• Slowly turn relief valve adjustment knob counter
clockwise to reduce pressure.
NOTICE
The green ON/ADV button must be released and
then pressed again to verify the pressure setting when the
setting is being decreased.
4. Repeat steps 2 and 3 as required until the correct
hydraulic pressure setting is obtained. Then, tighten
the relief valve locknut to maintain the setting.
5. Start and stop the pump several times to check the
setting.
+
-
1
2
Key:
1. Adjustment Knob
2. Locknut
Figure 9: User-Adjustable Pressure Relief Valve
(Torque Adjustment)
7.6 Disconnecting Hydraulic Hoses
Disconnect hydraulic hoses after use as described in the
following steps:
1. Verify that pump hydraulic pressure gauge indicates
zero (0) psi/bar. If any pressure is indicated, relieve
pressure as described in Section 7.3 of this manual.
2. Shut o the pump compressed air supply. Be certain
that the air filter/regulator pressure gauge indicates
zero (0) psi/bar.
3. At pump hydraulic couplers “A” and “B”, loosen the
threaded collars on the female couplers. Disconnect
hoses from pump.
4. To prevent contamination, install dust covers over
pump and hose couplers.

L4402 .13
7.7 Pump Priming Procedure
If the pump operates sluggishly or if wrench operation
is erratic, first perform the air removal procedure as
described in Section 7.4. If problems persist, then perform
the pump priming procedure as described in the following
steps.
NOTICE
As needed during this procedure, refer to
previous sections of this manual for detailed information
regarding the hydraulic reservoir, air filter/regulator,
remote pendant buttons and user-adjustable relief valve.
1. Be sure that hydraulic reservoir is full. Oil level should
be up to - but not above - the top oil sight glass. If
oil level is low, add additional oil as described in the
procedure in Section 6.2.
2. Turn the user-adjustable relief valve counter-
clockwise until it is slack. Verify that the pump
hydraulic pressure gauge indicates zero (0) psi/bar.
3. Be sure that air supply is connected and that inlet air
pressure is approximately 100 psi [6.9 bar].
4. Set the air filter/regulator to 30 psi [2.1 bar].
5. On the remote pendant, press and release the green
ON/ADV button.
6. Allow the pump to run for about 10-15 seconds. This
will expel trapped air in the hydraulic system.
7. Increase the air pressure at the air filter/regulator to
70 psi [4.8 bar] and allow the pump to run for an
additional 10 seconds.
8. Press and hold the green ON/ADV button. As the
button remains depressed, allow the pump to run for
an additional 5 to 10 seconds to expel air from the
system.
9. Increase the air pressure at the air filter/regulator to
100 psi [6.9 bar].
10. Observe the pump hydraulic pressure gauge. Turn
the user-adjustable relief valve clockwise until
hydraulic pressure increases to 10,000 psi [690 bar].
11. Release the green ON/ADV button and observe the
pump hydraulic pressure gauge. The gauge should
indicate 2500-2600 psi [172-180 bar].
12. Press the green ON/ADV button and confirm
pressure builds to 10,000 psi [690 bar].
13. Press the red OFF button to stop the pump. Verify
that the pump hydraulic pressure gauge indicates
zero (0) psi/bar.
14. Hold the red OFF button down while pressing and
releasing the green ON/ADV button several times.
This will release trapped pressure in the retract
circuit.
8.0 MAINTENANCE
8.1 Oil Change and Hydraulic Reservoir
Change the oil in the hydraulic reservoir after every 250
hours of operation. If pump is operated in very dusty areas
or at high temperatures, oil changes should be performed
more frequently.
Refer to the following steps. See Figure 10.
1. Stop the pump and relieve hydraulic pressure. Be
sure that hydraulic pressure gauge indicates zero (0)
psi/bar.
2. Shut o compressed air supply. Disconnect air
supply line from air inlet connection on pump.
3. Place the pump on a workbench or other suitable
surface. Place a pan or container under the oil drain
plug. Oil reservoir capacity is approximately 0.5
gallons [1.9 litres].
4. Slowly loosen the oil drain plug and remove it. Allow
all used oil to drain from the reservoir into the pan or
container.
NOTICE
Dispose of hydraulic oil in accordance with all
applicable laws and regulations.
NOTICE
If the used oil is dirty, or if pump performance
has been sluggish, clean the interior of the hydraulic
reservoir after oil is drained, as described in Section 8.2.
NOTICE
When adding oil or refilling the hydraulic reservoir,
use only Enerpac HF hydraulic oil. Use of other oils may
result in damage to pump components and may void the
Enerpac product warranty.
5. Clean and reinstall the reservoir oil drain plug.
6. Remove the reservoir oil fill plug. Slowly add
hydraulic oil through the fill hole until oil level is up
to - but not above - the top oil level sight glass. DO
NOT OVERFILL.
2
3
1
Key:
1. Oil Fill Plug
2. Air Breather
(See Figure 2)
3. Oil Drain Plug
Figure 10: Reservoir Oil Drain, Fill and Vent Locations

14 L4402
7. Clean and reinstall the reservoir oil fill plug.
8. Check that reservoir air breather is not loose, Replace
breather if clogged, damaged or missing.
9. Reconnect the compressed air supply line to the
pump air inlet connection.
10. Operate the pump without load and check for oil
leaks. If leaks are found, immediately stop the pump,
relieve all hydraulic pressure and shut o compressed
air supply. Repair any leaks before continuing.
11. Remove trapped air in the hydraulic system as
described in Section 7.4 of this manual.
12. After air removal procedure is completed, stop the
pump and relieve hydraulic pressure. Check the
hydraulic reservoir oil level. Refer to Section 6.2.
13. If the oil level has dropped and is not visible in the
top oil sight glass: Add additional oil as required,
until the oil level is up to - but not above - the top oil
sight glass.
8.2 Hydraulic Reservoir Cleaning & Inspection
It is recommended that the hydraulic reservoir be cleaned
and inspected when the oil is changed. At this time, the
piston block oil intake screens can be cleaned and the
pump components can be visually checked for obvious
wear or damage.
This procedure is mandatory if it is suspected that the oil
is contaminated or if pump performance is sluggish.
1. Completely drain all oil from reservoir. Follow steps 1
through 5 of Section 8.1.
2. Be certain that the compressed air supply line is
disconnected from the pump air inlet connection.
3. Disconnect pump air tubes at locations “A” and “B”
as shown in Figure 11 and Figure 12.
NOTICE
To release each air tube, firmly press down on the
connector collar and pull the air tube outward. Disconnect
tubes only at locations “A” and “B”. The other air tubes
can remain connected for this procedure.
Key:
1. Air Tube
2. Connector
2
1
A
Figure 11: Disconnect Air Tube - Location A
B
Key:
1. Air Tube
2. Connector
1
2
Figure 12: Disconnect Air Tube - Location “B”.
4. Remove four cap screws and washers. Carefully lift
roll cage and air filter/regulator/lubricator o of the
hydraulic reservoir as an assembly. See Figure 13.
5. Remove the remaining six capscrews and washers
securing the pump cover plate. Lift the cover plate,
hydraulic control valve, air motor and pump element
o of the reservoir as an assembly. See Figure 14.
6. Inspect the reservoir interior. Using a clean lint
free cloth, remove any dirt or sludge from interior
surfaces.
7. Remove the reservoir magnet and wipe it with a
clean, lint free cloth. Remove any metal shavings
or sludge. Then, reinstall the magnet on the side of
the piston block, in the preferred location shown in
Figure 15.
Additional notes:
• The reservoir magnet is secured only by magnetic
force. For this reason, its exact location may vary.
• To prevent possible oil flow restrictions, do not place
the magnet on the oil intake screens or place it loose
inside the hydraulic reservoir.
• Avoid placing the magnet near the oil return tube,
where oil turbulence may reduce its ability to collect
metallic particles.
• If the magnet is missing, order a replacement
magnet from your Enerpac distributor. Refer to the
pump repair parts sheet for part number
NOTICE
Operation of pump without magnet installed may
result in excessive wear and damage to pump hydraulic
components.
8. Inspect the piston blocks and other exposed pump
components for obvious signs of wear or damage.
Verify that there are no loose components.
9. Inspect the high pressure tube connecting the pump
element to the hydraulic control valve. Tighten or
replace any loose or damaged fittings or components
as required.

L4402 .15
1
2
3
4
AB
1
2
3
5
4
Key:
1. Roll Cage &
Filter/Regulator/Lubricator
2. Capscrew
3. Gasket
4. Pump & Reservoir Assembly
Figure 13: Reservoir Inspection & Cleaning (View 1 of 2)
10. Using a clean lint free rag, wipe the oil intake screen
on each of the three piston blocks. Remove any dirt
or sludge.
11. Inspect the reservoir gasket. Replace it with a new
gasket if worn or damaged.
12. After cleaning is completed, reassemble the pump
following steps 4 and 5 in reverse order. Apply Loctite
243 thread sealant to all cover plate mounting bolts
and torque them to 60-75 lb-in [6.8-8.5 Nm].
13. Reconnect the pump air tubes. See Figure 11 and
Figure 12.
14. Refill the hydraulic reservoir and check for leaks as
described in steps 6 through 13 of Section 8.1.
1
2
3
4
AB
1
2
3
5
4
Key:
1. Capscrew
2. Gasket
3. Pump, Cover Plate &
Air Motor Assembly
4. Reservoir Gasket
5. Hydraulic Reservoir
Figure 14: Reservoir Inspection & Cleaning (View 2 of 2)

16 L4402
3
2
5
4
1
Key:
1. Magnet
2. Piston Block
3. Oil Intake Screen
4. Oil Return Tube
5. High Pressure Tube
Figure 15: Inspection and Cleaning - Pump Element
8.3 Air Muer
See Figure 16.
When the pump is run for long periods of time, ice may
form on the muer element and can be removed (while air
motor is o) using a clean rag. Be certain that the muer
exhaust holes remain unobstructed.
If the air pressure is within the normal range, and the
pump runs slowly or stops unexpectedly, the muer may
be clogged and need replacement. Refer to the pump
repair parts sheet for air muer part number.
Figure 16: Air Muer
8.4 Air Filter/Regulator
See Figure 17.
• Periodically check the filter bowl for water. If water
is visible in the bowl window, turn the drain valve at
bottom of filter bowl to drain the water.
• Replace the filter bowl if it becomes damaged,
crazed or cracked
• Keep the filter bowl clean to maintain eciency.
USE MILD SOAP AND WATER ONLY! DO NOT use
cleansing agents such as acetone, benzene, carbon
tetrachloride, gasoline, toluene, etc., which will
damage the bowl.
• Replace air filter (5μ element - located inside filter
bowl) before it becomes dirty or clogged.
• Refer to the air filter/regulator manufacturer’s
instructions for complete maintenance and
replacement parts information.
MAX
OIL
MIN
OIL
LEVEL
MAX
2
7
6
5
3
4
1
MAX
OIL
MIN
OIL
LEVEL
MAX
P
U
S
H
T
O
L
O
C
K
2
7
65
3
4
1
2
3
1
MAX
OIL
MIN
OIL
LEVEL
MAX
2
3
1
Key:
1. Filter Bowl
2. Filter Bowl Window
3. Filter Bowl Drain
Figure 17: Air Filter/Regulator
8.5 Air Lubricator
• Periodically check the lubricant level in the air
lubricator bowl. If it drops to below half full, add
additional lubricant as required. Refer to Section 6.6
for lubricant specifications and filling procedure.

L4402 .17
• Periodically clean the air lubricator bowl. USE
MILD SOAP AND WATER ONLY! DO NOT use
cleansing agents such as acetone, benzene, carbon
tetrachloride, gasoline, toluene, etc., which will
damage the bowl.
• Replace the air lubricator bowl if it becomes
damaged crazed or cracked.
• Refer to the air lubricator manufacturer’s instructions
for complete maintenance and replacement parts
information.
9.0 TROUBLESHOOTING
Only qualified hydraulic maintenance personnel with
appropriate skills and training should be permitted
to service the pump or system components. The
Troubleshooting Chart is not all inclusive but is intended
to be used as a guide to help diagnose and resolve the
most common problems which may occur.
Troubleshooting Chart
Symptom Possible Cause Solution
1. Pump will not start. a. Air turned o or air supply line
blocked.
Turn on air. Verify that gauge on air filter/regulator
indicates pressure.
b. Low air pressure and/or flow. Increase air pressure as required. Verify that air system is
capable of producing the minimum required pressure and
flow. Refer to Section 3.1.
c. Air motor control valve
malfunction.
Check for proper operation of the air motor control valve.
Replace if required.
d. Mechanical damage to pump
and/or air motor.
Troubleshoot pump air motor and pump element
components to determine cause. Check pendant controls
and air lines.
2. Pump stops under load. a. Low air pressure.
or
Minimum required air flow rate is
insucient.
Increase air pressure as required.
Use a larger diameter air supply line and/or adequate air
source.
b. Air muer clogged by ice or dirt. Check air muer exhaust vents. Remove ice if present.
Replace air muer if clogged.
c. Pump bypass valve out of
adjustment or malfunctioning.
Readjust or repair pump bypass valve.
d. Mechanical damage to pump
and/or air motor.
Troubleshoot pump air motor and pump element
components to determine cause.
3. Pump fails to build
pressure or builds less
than full pressure.
a. User-adjustable relief valve open
or set too low.
Increase relief valve pressure setting. Refer to Section 7.5.
b. Pump needs priming. Perform pump priming procedure. Refer to Section 7.7.
c. External leak in system. Check entire hydraulic system for leaks. Tighten, repair or
replace components as required.
d. Oil needs changing.
Piston block oil intake screens
clogged.
Drain, clean and inspect the hydraulic reservoir per
instructions in Section 8.1 and Section 8.2. Remove any
dirt or sludge. Clean the oil intake screens.
e. Internal leak in hydraulic control
valve or pump element. Worn or
damaged internal components.
Troubleshoot hydraulic control valve and pump element
components. Tighten, repair or replace components as
required.
(continued on next page)

18 L4402
Troubleshooting Chart (continued)
Symptom Possible Cause Solution
4. Low oil flow. a. Low air pressure and/or flow. Increase air pressure as required. Verify that air system is
capable of producing the minimum required pressure and
flow. Refer to Section 6.3.
b. Dirty air filter element(s). Replace filter element(s) inside the air filter/lubricator.
Refer to filter/lubricator manufacturer’s instructions and
parts lists.
c. Internal leak in hydraulic control
valve or pump. Worn or damaged
internal components.
Troubleshoot hydraulic control valve and pump element
components. Tighten, repair or replace components as
required.
d. Oil needs changing.
Piston block oil intake screens
clogged.
Drain, clean and inspect the hydraulic reservoir per
instructions in Section 8.1 and Section 8.2. Remove any
dirt or sludge. Clean the oil intake screens.
5. Torque wrench advances
or retracts erratically.
a. Air in the hydraulic system. Advance and retract the torque wrench until operation is
smooth. Refer to Section 7.4.
b. Low air pressure and/or flow. Increase air pressure as required. Verify that air system is
capable of producing the minimum required pressure and
flow. Refer to Section 3.1.
c. External leak in hydraulic system. Check entire hydraulic system for leaks. Tighten, repair or
replace components as required.
d. Torque wrench internal leakage.
Worn or damaged internal
components.
Troubleshoot torque wrench.
Tighten, repair or replace components as required.
Refer to torque wrench manufacturer’s repair and
overhaul instructions.
e. Internal leak in hydraulic control
valve or pump element. Worn or
damaged internal components.
Troubleshoot pump hydraulic control valve and pump
element.
Tighten, repair or replace components as required.

L4402 .19
NOTES
_______________________________________________________________________________________
_______________________________________________________________________________________
_______________________________________________________________________________________
_______________________________________________________________________________________
_______________________________________________________________________________________
_______________________________________________________________________________________
_______________________________________________________________________________________
_______________________________________________________________________________________
_______________________________________________________________________________________
_______________________________________________________________________________________
_______________________________________________________________________________________
_______________________________________________________________________________________
_______________________________________________________________________________________
_______________________________________________________________________________________
_______________________________________________________________________________________
_______________________________________________________________________________________
_______________________________________________________________________________________
_______________________________________________________________________________________
_______________________________________________________________________________________
_______________________________________________________________________________________
_______________________________________________________________________________________
_______________________________________________________________________________________
_______________________________________________________________________________________

www.enerpac.com
© 2020 Enerpac, All Rights Reserved.