241-0496
BRUSHLESS 3/8’’
IMPACT WRENCH
For questions / comments, technical assistance or repair parts –
Please Call Toll Free: 1-866-917-4374 (M-F 8:30am-5:00pm EST).
OPERATOR’S MANUAL
CAUTION:
To Reduce The Risk Of Injury, User Must Read And
Understand Operator’s Manual. Save These Instructions For Future
Reference.
TABLE OF CONTENTS
Safety Symbols ......................................................... Page 2
Safety Instructions ...................................................... Page 3
Overview/Specifications ................................................. Page 7
Assembly ............................................................. Page 8
Operation ............................................................. Page 9
Maintenance .......................................................... Page 13
Troubleshooting ....................................................... Page 13
Warranty .............................................................Page 14
Page 2
SAFETY SYMBOLS
Some of these following symbols may be used on this tool. Please study them and learn their
meaning. Proper interpretation of these symbols will allow you to operate the tool better and
more safely.
WARNING:
To ensure safety and reliability, all repairs should be performed by a
qualified service technician.
Symbol
Name
Designation / Explanation
V Volts Voltage
A Amperes Current
Hz Hertz Frequency (cycles per second)
W Watts Power
∿
Alternating current Type of current
�
Direct current Type or characteristic of current
n
o
No-load speed Rotational speed at no load
lbs Pounds Weight
RPM Revolutions per minute Speed
.../min
Per minute
Revolutions, strokes, surface speed
orbits, etc., per minute
BPM Beats per minute Impact frequency of the tool
Wear safety goggles
WARNING:
The operation of
any
power tool can result in foreign
objects being thrown into your eyes,
which can result in severe eye dam-
age. Before beginning power tool
operation, always wear safety goggles
or safety glasses with side shields
and a full-face shield when needed.
We recommend a Wide Vision Safety
Mask for use over eyeglasses or stan-
dard safety glasses with side shields.
Always use eye protection which is
marked to comply with
ANSI Z87.1.
Page 3
The purpose of safety symbols is to attract your attention to possible dangers. The
safety symbols and the explanations with them deserve your careful attention and
understanding. The symbol warnings do not, by themselves, eliminate any danger. The
instructions and warnings they give are not substitutes for proper accident prevention
measures.
WARNING:
Be sure to read and understand all safety instructions in this manual,
including all safety alert symbols such as “DANGER,” “WARNING,” and “CAUTION”
before using this tool. Failure to follow all instructions listed below may result in electric
shock, fire, and/or serious personal injury.
SYMBOL MEANING
SAFETY ALERT SYMBOL: Indicates DANGER, WARNING, OR CAUTION.
May be used in conjunction with other symbols or pictographs.
DANGER:
Indicates an imminently hazardous situation, which, if not avoided,
will result in death or serious injury.
WARNING:
Indicates a potentially hazardous situation, which, if not avoided,
could result in death or serious injury.
CAUTION:
Indicates a potentially hazardous situation, which, if not avoided,
could result in minor or moderate injury.
NOTICE:
(Without Safety Alert Symbol) Indicates a situation that may result in property
damage.
SAVE THESE INSTRUCTIONS!
SAFETY INSTRUCTIONS
Page 4
General Power Tool Safety Warnings
WARNING:
Read all safety warn-
ings and instructions!
Failure to follow the warnings and
instructions may result in electric shock, fire
and / or serious injury.
Save all warnings and instructions for
future reference.
The term “power tool” in the warnings refers
to your mains-operated (corded) power tool
or battery-operated (cordless) power tool.
WORK AREA SAFETY
1. Keep the work area clean and well lit.
Cluttered or dark areas invite accidents.
2. Do not operate power tools in explosive
atmospheres, such as in the presence of
flammable liquids, gases or dust. Power
tools create sparks which may ignite the
dust or fumes.
3. Keep children and bystanders away
while operating a power tool. Distractions
can cause you to lose control.
ELECTRICAL SAFETY
1. Power tool plugs must match the
outlet. Never modify the plug in any way.
Do not use any adapter plugs with earthed
(grounded) power tools. Unmodified plugs
and matching outlets will reduce risk of
electric shock.
2. Avoid body contact with earthed
or grounded surfaces such as pipes,
radiators, ranges and refrigerators. There
is an increased risk of electric shock if your
body is earthed or grounded.
3. Do not expose power tools to rain or
wet conditions. Water entering a power tool
will increase the risk of electric shock.
4. Do not abuse the cord. Never use the
cord for carrying, pulling or unplugging the
power tool. Keep the cord away from heat,
oil, sharp edges or moving parts. Damaged
or entangled cords increase the risk of
electric shock.
5. When operating a power tool outdoors,
use an extension cord suitable for outdoor
use. Use of a cord suitable for outdoor use
reduces the risk of electric shock.
6. If operating a power tool in a damp
location is unavoidable, use a ground-
fault circuit interrupter (GFCI) protected
supply. Use of a GFCI reduces the risk of
electric shock.
PERSONAL SAFETY
1. Stay alert, watch what you are doing
and use common sense when operating
a power tool. Do not use the tool while
you are tired or under the influence of
drugs, alcohol, or medication. A moment of
inattention while operating power tools may
result in serious personal injury.
2. Use personal protective equipment.
Always wear eye protection. Protective
equipment such as a dust mask, non-skid
safety shoes, hard hat, or hearing protection,
used for appropriate conditions, will reduce
personal injuries.
3. Prevent unintentional starting. Ensure
that the switch is in the off-position before
connecting to a power source and/or
battery pack, picking up or carrying the
tool. Carrying power tools with your finger
on the switch or energizing power tools that
have the switch on invites accidents.
4. Remove any adjusting key or wrench
before turning the power tool on. A wrench
or a key left attached to a rotating part of the
power tool may result in personal injury.
5. Do not overreach. Keep proper footing and
balance at all times. This enables better control
of the power tool in unexpected situations.
6. Dress properly. Do not wear loose
clothing or jewellery. Keep your hair,
clothing and gloves away from moving
parts. Loose clothes, jewellery or long hair
can be caught in moving parts.
7. If devices are provided for the
connection of dust extraction and
collection facilities, ensure that these are
connected and properly used. Use of these
devices can reduce dust-related hazards.
8. Do not let familiarity gained from
frequent use of tools allow you to become
complacent and ignore tool safety
principles. A careless action can cause
severe injury within a fraction of a second.
SAFETY INSTRUCTIONS
Page 5
SAFETY INSTRUCTIONS
POWER TOOL USE AND CARE
1. Do not force the power tool. Use the
correct power tool for your application. The
correct power tool will do the job better and
safer at the rate for which it was designed.
2. Do not use the power tool if the switch
does not turn it on and off. Any power tool
that cannot be controlled with the switch is
dangerous and must be repaired.
3. Disconnect the plug from the power
source and/or the battery pack from the
power tool before making any adjustments,
changing accessories, or storing power
tools. Such preventive safety measures
reduce the risk of starting the power tool
accidentally.
4. Store idle power tools out of the reach
of children and do not allow persons
unfamiliar with the power tool or these
instructions to operate the power tool.
Power tools are dangerous in the hands of
untrained users.
5. Maintain power tools. Check for
misalignment or binding of moving parts,
breakage of parts and any other condition
that may affect the power tool’s operation.
If damaged, have the power tool repaired
before use. Many accidents are caused by
poorly maintained power tools.
6. Keep cutting tools sharp and clean.
Properly maintained cutting tools with sharp
cutting edges are less likely to bind and are
easier to control.
7. Use the power tool, accessories,
tool bits etc. in accordance with these
instructions, taking into account the
working conditions and the work to be
performed. Use of the power tool for
operations different from those intended
could result in a hazardous situation.
8. Keep handles and grasping surfaces
dry, clean and free from oil and grease.
Slippery handles and grasping surfaces do
not allow for safe handling and control of the
tool in unexpected situations.
BATTERY TOOL USE AND CARE
1. Recharge only with the charger
specified by the manufacturer. A charger
that is suitable for one type of battery pack
may create a risk of fire when used with
another battery pack.
2. Use power tools only with specifically
designated battery packs. Use of any other
battery packs may create a risk of injury
and fire.
3. When battery pack is not in use, keep
it away from other metal objects, like
paper clips, coins, keys, nails, screws or
other small metal objects, that can make
a connection from one terminal to another.
Shorting the battery terminals together may
cause burns or a fire.
4. Under abusive conditions, liquid may
be ejected from the battery; avoid contact.
If contact accidentally occurs, flush with
water. if liquid contact eyes, additionally
seek medical help. Liquid ejected from the
battery may cause irritation or burns.
5. Do not use a battery pack or tool that
is damaged or modified. Damaged or
modified batteries may exhibit unpredictable
behaviour resulting in fire, explosion or risk
of injury.
6. Do not expose a battery pack or tool
to fire or excessive temperature. Exposure
to fire or temperature above 130 °C (265 °F)
may cause explosion.
7. Follow all charging instructions and
do not charge the battery pack or tool
outside the temperature range specified
in the instructions. Charging improperly or
at temperatures outside the specified range
may damage the battery and increase the
risk of fire.
SERVICE
1. Have your power tool serviced by a
qualified repair person using only identical
replacement parts. This will ensure that the
safety of the power tool is maintained.
2. Never service damaged battery
packs. Service of battery packs should
only be performed by the manufacturer or
authorized service providers.
Page 6
SAFETY INSTRUCTIONS
SPECIFIC SAFETY RULES FOR
BRUSHLESS IMPACT WRENCH
1. Hold power tool by insulated gripping
surfaces, when performing an operation
where the cutting accessory may contact
hidden wiring. Cutting accessory contacting
a “live” wire may make exposed metal parts
of the power tool “live” and could give the
operator an electric shock.
2. Use clamps or another practical way to
support the workpiece and secure it to a
stable platform. Holding the work by hand
or against your body is unstable and may
lead to loss of control.
3. Do not drill, fasten or break into
existing walls or other blind areas where
electrical wiring may exist. If this situation
is unavoidable, disconnect all fuses or
circuit breakers feeding the worksite.
4. Always wear safety goggles or eye
protection when using this tool.
5. Bit, sockets and tools get hot during
operation. Wear gloves when touching them
after use.
6. Wear ear protectors when using the
tool for extended periods. Prolonged
exposure to high intensity noise can cause
hearing loss.
7. Avoid accidental starting. Be sure that
the forward/center-lock/reverse switch is in
the off position before inserting the battery
pack. Carrying appliances with your finger
on the switch or inserting the battery pack
into an appliance with the switch on invites
accidents.
8. Remove the battery pack before
changing accessories. Accidental starting
may occur, because battery appliances
with a battery inserted are in the operative
condition.
DANGER:
People with electronic
devices, such as pacemakers, should
consult their physician(s) before using this
product. Operation of electrical equipment
in close proximity to a heart pacemaker
could cause interference or failure of the
pacemaker.
WARNING:
Some dust created by
power sanding, sawing, grinding, drilling
and other construction activities contains
chemicals known to the state of California
to cause cancer, birth defects or other
reproductive harm. Some examples of
these chemicals are:
• Lead from lead-based paints
• Crystalline silica from bricks and
cement and other masonry products,
and
• Arsenic and chromium from chemically-
treated lumber.
Your risk from these exposures varies,
depending on how often you do this type
of work. To reduce your exposure to these
chemicals: work in a well ventilated area,
and work with approved safety equipment,
such as those dust masks that are specially
designed to filter out microscopic particles.
Avoid prolonged contact with dust from
power sanding, sawing, grinding, drilling,
and other construction activities. Wear
protective clothing and wash exposed
areas with soap and water. Allowing dust
to get into your mouth or eyes or to lie on
the skin may promote absorption of harmful
chemicals.
9. For best results, your battery and tool
should be charged, stored and used in a
location where the temperature is more
than 5°C (41°F) but less than 40°C (104°F).
Do not store outside or in vehicles.
SAVE THESE INSTRUCTIONS!
Page 7
OVERVIEW
3/8’’ Square Driver
Variable-Speed
Trigger Switch
LED Worklight
Belt Clip
Direction-of-Rotation
Selector (Forward/
Center-Lock/Reverse)
SPECIFICATIONS
No-load speed 0-2,500 RPM
Impacts per minute 0-3,500 BPM
Maximum torque 150 ft. lbs.
Drive 3/8’’ Square
Tool weight 2lbs.5oz.
Compatible batteries
252-8027, 252-8029, 252-8030, 252-8031,
252-8034, 252-8035
Battery chargers 252-8025, 252-8026, 252-8037
Page 8
ASSEMBLY
WARNING:
If any part is broken
or missing, DO NOT attempt to attach the
battery pack or operate the tool until the
broken or missing part is replaced. Failure
to do so could result in possibly serious
injury.
WARNING:
Do not attempt to
modify this tool or create accessories not
recommended for use with this tool. Any
such alteration or modification is misuse
and could result in a hazardous condition
leading to possibly serious injury.
WARNING:
To prevent accidental
starting that could cause serious personal
injury, always remove the battery pack
from the impact wrench when you are
assembling parts, making adjustments,
installing or removing bits, or when it is
not in use.
CONTENTS
Brushless impact wrench, belt clip and
instruction manual.
UNPACKING
1. Carefully remove the tool and any
accessories from the carton. Make sure
that all items listed in the packing list are
included.
2. Inspect the tool carefully to make sure
that no breakage or damage occurred
during shipping.
3. Do not discard the packing material
until you have carefully inspected and
satisfactorily operated the tool.
Page 9
OPERATION
TO ATTACH BATTERY PACK
(FIG.1)
FIG. 1
Battery-release
button
Latch
1. Lock the trigger switch on the impact
wrench by placing the direction-of-
rotation (forward/center-lock/reverse)
selector in the center position.
2. Align the raised ribs on the battery
pack with the grooves on the bottom of
the impact wrench, and then slide the
impact wrench forward to attach the
battery pack to the tool.
NOTICE: Make sure that the latch on the
battery pack snaps into place and the
battery pack is secured to the tool before
beginning operation. Improper assembly
of the battery pack can cause damage to
internal components.
TO DETACH BATTERY PACK
(FIG.1)
1. Lock the trigger switch on the impact
wrench by placing the direction-of-
rotation (forward/center-lock/reverse)
selector in the center position.
2. Depress the battery-release button,
located on the front of the battery pack,
to release the battery pack.
3. Pull the battery pack and remove it from
the tool.
VARIABLE-SPEED TRIGGER
SWITCH (FIG. 2)
FIG. 2
Direction-
of-rotation
selector
Variable-
speed trigger
switch
1. To turn the impact wrench ON, press the
trigger switch.
2. To turn the impact wrench OFF, release
the trigger switch.
3. The variable-speed trigger switch
delivers higher speed with increased
trigger pressure and lower speed with
decreased trigger pressure.
Page 10
OPERATION
DIRECTION-OF-ROTATION
SELECTOR (FIG. 3)
FIG. 3
Forward
Reverse
The direction of bit rotation is reversible and
is controlled by a selector located above the
trigger switch. With the impact wrench held
in normal operating position:
1. Position the direction-of-rotation
selector to the right of the tool for
reverse rotation.
2. Position the direction-of-rotation
selector to the left of the tool for forward
rotation.
3. Setting the direction-of-rotation selector
in the OFF (center-lock) position helps
reduce the possibility of accidental
starting when not in use.
NOTICE: To prevent gear damage, always
allow the impact wrench to come to
a complete stop before changing the
direction of rotation.
ELECTRIC BRAKE
To stop the impact wrench, release the
trigger switch and allow the chuck to come
to a complete stop. The electric brake
quickly stops the chuck from rotating. This
feature engages automatically when you
release the trigger switch.
LED WORKLIGHT (FIG.4)
FIG. 4
LED worklight
The LED worklight, located on the base of
the impact wrench, will illuminate when the
trigger switch is depressed. This provides
additional light on the surface of the
workpiece. The LED worklight will turn off a
few seconds later after the trigger switch is
released.
INSTALLING AND REMOVING
THE BELT CLIP (FIG.5)
FIG. 5
Belt clip
Screw
To install the belt clip:
1. Align the rib of the clip with the hole on
the base of the impact wrench.
2. Insert the screw (included) and tighten
the screw securely with a screwdriver.
The belt clip can be positioned on either
side of the tool.
Page 11
OPERATION
To remove the belt clip:
1. Use a screwdriver to loosen the screw
that attaches the belt clip to the impact
wrench.
2. Remove the screw and the belt clip.
INSTALLING AND REMOVING
THE SOCKET (FIG.6)
FIG. 6
Always use the correct size socket for bolts
and nuts. An incorrect socket will result
in inaccurate and inconsistent fastening
torque and/or damage to the bolt or nut.
1. Lock the trigger switch by placing the
direction-of-rotation selector in the OFF
(center) position.
2. To install the socket, push it onto the
output drive of the tool until it locks into
place.
3. To remove the socket, simply pull it off.
INSTALLING FASTENERS
NOTICE: Always keep the Impact Wrench
at a right angle to the fastener to avoid
damage to the fastener head.
To fasten:
1. Start threading the fastener by hand
onto or into its threaded counterpart
(e.g. nut onto bolt, or bolt into nut or
threaded hole).
2. With the proper impact socket securely
mounted to the wrench, slide the impact
socket onto the nut or bolt head.
3. Place the direction-of-rotation selector
in the FORWARD position. Hold the
tool firmly while depressing the trigger
switch. The impact socket will turn the
fastener and impacting will begin once
the fastener encounters resistance.
WARNING:
Do not over-tighten, as
the force of the Impact Wrench can break
the fastener.
To loosen:
1. With the proper impact socket securely
mounted to the wrench, slide the impact
socket onto the bolt head.
2. Place the direction-of-rotation selector
in the REVERSE position. Hold the tool
firmly while depressing the trigger
switch. The tool will start to impact
immediately.
3. Once the fastener has “broken loose,”
it will start to unthread. Be careful that
you do not allow a fastener to spin
freely once it is no longer engaged with
its threaded counterpart, as it may be
thrown out of the socket.
Impacting tips
The proper fastening torque may differ de-
pending on the type or size of the bolt, the
material of the workpiece to be fastened,
etc.
NOTICE: Hold the tool straight along the
axis of the bolt or nut.
Page 12
OPERATION
NOTICE: Excessive fastening torque may
damage the bolt/nut or socket. Before
starting your job, always perform a test
operation to determine the proper fasten-
ing time for your bolt or nut.
Practice with various fasteners, noting the
length of time required to reach the desired
torque. Check the tightness with a hand-
torque wrench. If the fasteners are too tight,
reduce the impacting time. If they are not
tight enough, increase the impacting time.
Hold the tool firmly, and place the socket
over the bolt or nut. Turn the tool on, and
fasten the bolt or nut to the proper torque.
The torque that is required to loosen a fas-
tener averages 75% to 80% of the tighten-
ing torque, depending on the condition of
the contacting surfaces. However, if rust or
corrosion causes seizing, more torque may
be required.
After fastening, always check the torque
with a torque wrench. The fastening torque
is affected by a wide variety of factors,
including the following:
• Socket
Failure to use the correct size socket will
cause a reduction in the fastening torque.
A worn socket (wear on the hex end or
square end) will cause a reduction in the
fastening torque.
• Bolt
Although the torque coefficient and the
class of bolt may be the same, the proper
fastening torque will differ according to
the diameter of the bolt.
Even if the diameters of bolts are the
same, the proper fastening torque will
differ according to the torque coefficient,
the class of bolt and the bolt length.
• Accessories
The use of a universal joint or an extension
bar (both available separately) will reduce
the fastening force of the impact wrench
somewhat. Compensate by fastening for
a longer period of time.
• Technique
The manner of holding the tool or the
material to be fastened will affect the
torque.
Page 13
WARNING:
Avoid using solvents
when cleaning plastic parts. Most plastics
are susceptible to damage from various
types of commercial solvents and may be
damaged by their use. Use a clean cloth
to remove dirt, dust, oil, grease, etc.
WARNING:
Using compressed
air may be the most effective cleaning
method. Always wear safety goggles
when cleaning tools with compressed air.
WARNING:
To avoid serious
personal injury, always remove the battery
pack from the tool when cleaning or
performing any maintenance. Contact a
qualified service technician for all repairs.
WARNING:
When servicing, use
only identical replacement parts. Use
of any other parts may create a hazard
or cause product damage. For more
information, call the toll-free helpline, at
1-866-917-4374.
MAINTENANCE
TROUBLESHOOTING
PROBLEM CAUSE OF THE PROBLEM SOLUTION
The impact wrench does
not work.
Battery is depleted. Charge the battery
Battery or the tool is
overheated.
Cool the battery or tool and
restart the tool again.
Battery is overloaded. Decrease the load on the
tool and restart the tool
again.
Socket cannot be installed. Improper socket selection. Use a suitable socket.
Motor overheating. Cooling vents are
obstructed.
Clean, clear vents. Do not
cover with hand during
operation.
Page 14
SAVE YOUR RECEIPTS
THIS WARRANTY IS VOID WITHOUT THEM
BRUSHLESS 3/8’’ IMPACT WRENCH
WARRANTY
90-DAY MONEY BACK GUARANTEE:
This MASTERFORCE
®
brand power tool carries our 90-DAY Money Back
Guarantee. If you are not completely satisfied with your MASTERFORCE
®
brand
power tool for any reason within ninety (90) days from the date of purchase, return
the tool with your original receipt to any MENARDS
®
retail store, and we will provide
you a refund – no questions asked.
3-YEAR LIMITED WARRANTY:
This MASTERFORCE
®
brand po wer tool carries our famous No Hassle 3-Year
Limited Warranty to the original purchaser. If, during normal use, this
MASTERFORCE
®
power tool breaks or fails due to a defect in material or
workmanship within three (3) years from the date of original purchase, simply bring
this tool with the original sales receipt back to your nearest MENARDS
®
retail store.
At its discretion, MASTERFORCE
®
agrees to have the tool or any defective part(s)
repaired or replaced with the same or similar MASTERFORCE
®
product or part
free of charge, within the stated warranty period, when returned by the original
purchaser with original sales receipt. Not withstanding the foregoing, this limited
warranty does not cover any damage that has resulted from abuse or misuse of the
Merchandise. This warranty: (1) excludes expendable parts including but not limited
to blades, brushes, belts, bits, light bulbs, and/or batteries; (2) shall be void if this
tool is used for commercial and/or rental purposes; and (3) does not cover any
losses, injuries to persons/property or costs. This warranty does give you specific
legal rights and you may have other rights, which vary from state to state. Be
careful, tools are dangerous if improperly used or maintained. Seller’s employees
are not qualified to advise you on the use of this Merchandise. Any oral
representation(s) made will not be binding on seller or its employees. The rights
under this limited warranty are to the original purchaser of the Merchandise and may
not be transferred to any subsequent owner. This limited warranty is in lieu of all
warranties, expressed or implied including warranties or merchantability and fitness
for a particular purpose. Seller shall not be liable for any special, incidental, or
consequential damages. The sole exclusive remedy against the seller will be for the
replacement of any defects as provided herein, as long as the seller is willing or
able to replace this product or is willing to refund the purchase price as provided
above. For insurance purposes, seller is not allowed to demonstrate any of these
power tools for you.
For questions / comments, technical assistance or repair parts – Please Call Toll
Free: 1-866-917-4374 (M-F 8:30am-5:00pm EST).
01/2020
© 2019 Menard, Inc., Eau Claire, WI 54703
