MasterForce 241-0314 User manual

241-0314
12 Volt Lithium-Ion
Impact Driver
For questions / comments, technical assistance or repair parts –
Please Call Toll Free: 1-866-917-4374. (M-F 8am – 6pm EST.)
OPERATOR’S MANUAL
CAUTION: To Reduce The Risk Of Injury, User Must Read And
Understand The 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 12
Troubleshooting ....................................................... Page 12
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 of characteristic of current
noNo-load speed Rotational speed at no load
Class II construction Double insulated construction
.../min Per minute Revolutions, strokes, surface speed
orbits, etc., per minute
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 damage. 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 eye-
glasses or standard safety glasses with
side shields. Always use eye protection
which is marked to comply with
ANSI Z87.1.

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 no 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.
Indicates an imminently hazardous situation, which, if not avoided,
will result in death or serious injury.
Indicates a potentially hazardous situation, which, if not avoided,
could result in death or serious injury.
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!
WARNING:
Page 3
SAFETY INSTRUCTIONS
DANGER:
CAUTION:

Page 4
SAFETY INSTRUCTIONS
GENERAL SAFETY RULES
Read all safety
warnings 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 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.
WARNING:
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
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 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 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.

Page 5
SAFETY INSTRUCTIONS
6. Dress properly. Do not wear loose
clothing or jewelry. Keep your hair,
clothing and gloves away from moving
parts. Loose clothes, jewelry or long hair
can be caught in moving parts.
7. If devices are provided for the
connection of dust extraction and
collection facilities, ensure these are
connected and properly used. Use of
these devices can reduce dust-related
hazards.
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 more safely 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.
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 the 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 contacts eyes, additionally
seek medical help. Liquid ejected from the
battery may cause irritation or burns.
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.

Page 6
SAFETY INSTRUCTIONS
SPECIFIC SAFETY RULES FOR
CORDLESS IMPACT DRIVER
1. Use the tool only with the batteries
and charger listed below:
Battery pack Charger
252-8016
252-8020
252-8017
2. WARNING: Hold power tools
by their insulated gripping surfaces when
performing an operation where the cutting
tool may contact hidden wiring or its own
cord. Contact with a “live” wire will make
exposed metal parts of the tool “live” and
shock the operator.
3. Use protective gloves when removing
the bit from the tool, or first allow the
clamp to cool down. The bit may be hot
after prolonged use.
4. Use protective gloves when operating
the tool. Protective gloves can help to keep
you from being burned and hurt.
5. Keep your hands away from the
motor-housing vents. Hot gas comes from
the vents during operation.
6. Do not operate the tool at full-load
for more than 30 seconds, as this can
cause the motor to become too hot, which
may damage the motor.
6. Release the trigger immediately when
the screws are tightened to avoid
breaking the screw.
7. For best results, your battery tool
should be charged in a location where
the temperature is more that 50°F (10°C)
but less that 104°F (40°C). Do not
store outside or in vehicles.

Page 7
OVERVIEW
SPECIFICATIONS
Motor 12 Volt DC
Switch VSR (Variable Speed Reversible)
No-load speed 0–2200 RPM
Impacts per minute 0–2700 BPM
Torque 800 in. lbs.
Driver Weight (with battery pack) 2 lb. 2 oz.
Chuck
LED worklight
Direction of rotation
selector
(Forward/Center Lock/
Reverse)
Variable-speed
trigger switch
Vents
Sleeve

Page 8
SPECIFICATIONS
WARNING: The safe use of this
product requires an understanding of the
information on the tool and in this
operator’s manual, as well as knowledge
of the project you are attempting. Before
use of this product, familiarize yourself
with all operating features and safety
rules.
VARIABLE SPEED
The variable-speed trigger switch delivers
higher speed with increased trigger
pressure and lower speed with decreased
trigger pressure.
FORWARD/REVERSE/CENTER LOCK
The direction-of-rotation selector located
above the trigger switch changes the
direction of bit rotation. Setting the trigger
switch in the OFF (center lock) position
helps to reduce the possibility of accidental
starting when not in use.
LED WORK LIGHT
Pressing the trigger switch illuminates the
LED worklight, located on the front of the
Impact Driver. This feature provides extra
light for increased visibility.
ASSEMBLY
WARNING: If any part is broken or
missing, do not attempt to plug in the
power cord, attach the battery or operate
the Impact Driver until the broken or
missing part is replaced. Failure to do so
could result in possible serious injury.
WARNING: Do not attempt to
modify this Impact Driver or create
accessories not recommended for use
with this Impact Driver. Any such
alteration or modification is misuse and
could result in a hazardous condition
leading to possible serious injury.
WARNING: To prevent accidental
starting that could cause serious personal
injury, always remove the battery pack
from the Impact Driver when assembling
parts.
UNPACKING
This product has been shipped
completely assembled.
1. Carefully remove the tool and any
accessories from the box. Make sure
that all items listed in the packing list
are included.
2. Inspect the tool carefully to make sure
no breakage or damage occurred during
shipping.
3. Do not discard the packing material
until you have carefully inspected and
satisfactorily operated the tool.
CONTENTS
Impact driver, 2 bits, nylon storage bag and
operator’s manual

Page 9
OPERATION
TO ATTACH BATTERY PACK
(FIG. 1)
1. Lock the trigger switch on the Impact
Driver by placing the direction of rotation
(forward/center lock/reverse) selector in
the center (off) position.
2. Align the raised rib on the battery
pack with the grooves of the driver, and
then attach the battery pack to the
impact driver.
NOTICE: When placing the battery pack in
the tool, be sure that the raised rib on
battery pack aligns with the groove inside
the Impact Driver and that the latches
snap into place properly. Improper
attachment of the battery pack can cause
damage to internal components.
TO DETACH BATTERY PACK
(FIG. 1)
1. Lock the trigger switch on the
Impact Driver by placing the direction of
rotation (forward/center lock/reverse)
selector in the center position.
2. Depress the battery release buttons
located on the both sides of the battery
pack to release the battery pack.
Attach
Detach
FIG. 1
3. Pull the battery pack out and remove it
from the tool.
WARNING: Battery tools are
always in operating condition. Therefore,
the direction-of-rotation selector should
always be locked when not in use or
carrying at your side.
TRIGGER SWITCH (FIG. 2)
To turn the impact driver ON, depress the
trigger switch. To turn it OFF, release the
trigger switch.
VARIABLE SPEED (FIG. 2)
The variable-speed trigger switch delivers
higher speed with increased trigger
pressure and lower speed with decreased
trigger pressure.
Variable-speed
trigger switch Direction-of-
rotation
selector
FIG. 2

Page 10
OPERATION
DIRECTION-OF-ROTATION
SELECTOR (FORWARD/
CENTER LOCK/REVERSE)
(FIG. 3)
The direction of bit rotation is reversible
and is controlled by a selector located
above the trigger switch. With the Driver
held in normal operating position:
1. Position the direction-of-rotation
selector to the left of the tool for
forward rotation.
2. Position the direction-of-rotation
selector to the right of the tool for
reverse rotation.
3. Setting the switch 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 Driver to come to a
complete stop before changing the
direction of rotation.
NOTICE: The Impact Driver will not run
unless the direction of rotation selector is
engaged fully to the left or right.
REVERSE
FORWARD
ELECTRIC BRAKE
To stop the Impact Driver, release the
trigger switch and allow the tool to come to
a complete stop. The electric brake quickly
stops rotating. This feature engages
automatically when you release the
trigger switch.
LED WORKLIGHT (FIG. 4)
The LED worklight, located on the front
of the Impact Driver, will illuminate when
the trigger switch is depressed. This
provides additional light on the surface
of the workpiece for operation in
lower-light areas. The LED worklight will
turn off when the trigger switch is
released.
FIG. 3
FIG. 4
LED worklight

Page 11
OPERATION
INSTALLING BITS (FIG. 5)
1. Lock the trigger switch by placing the
direction of rotation selector in the
OFF (center) position.
2. With one hand, pull the sleeve toward
the front of the tool, and hold it in place.
3. With the other hand, insert a 1/4-in. bit
into the hexagonal hole in the bit
retainer.
4. Release the sleeve and check that it
returns to its original position.
WARNING: If the sleeve does not
return to its original position, the bit is not
correctly installed. Retry until the bit is
properly installed.
NOTICE: When the bit diameter is larger
than 1/4 in., use a suitable adapter
(available separately) to install the bit.
REMOVING BITS (FIG. 5)
WARNING: Use protective gloves
when removing the bit from the tool, or
first allow the bit to cool down. The bit
may be hot after prolonged use.
1. Lock the trigger switch by placing the
direction-of rotation selector in the OFF
(center) position.
FIG. 5
2. Pull the sleeve towards the front of the
tool, and hold it in place.
3. Remove the bit from the hexagonal
hole in the bit retainer.
4. Release the sleeve.
TIGHTENING AND LOOSENING
SCREWS AND NUTS
1. Install the correct bit.
2. Apply just enough pressure to keep the
bit engaged on the screw or nut.
3. Apply minimal pressure to the trigger
switch initially. Increase the speed only
when full control can be maintained.
NOTICE: This driver is equipped with an
electric brake. When the brake is
functioning properly, sparks may be
visible through the vent slots in the
housing. This is normal and is the action
of the brake.

MAINTENANCE
WARNING: To avoid serious
personal injury, always remove the battery
pack from the tool when cleaning or
performing any maintenance.
GENERAL MAINTENANCE
Avoid using solvents when cleaning plastic
parts. Most plastics are susceptible to
damage from various types of commercial
solvents. Use clean cloths to remove dirt,
dust, oil, grease, etc.
Page 12
TROUBLESHOOTING
PROBLEM CAUSE SUGGESTED CORRECTIVE ACTION
The driver does
not work.
The battery is depleted. Charge the battery.
The bit cannot be
installed.
1. The sleeve is not released. 1. Release the sleeve.
2. The bit does not fit the
sleeve.
2. Use a suitable adapter.
The motor is
overheating.
Be sure the cooling vents
are free from dust and
obstacles.
Clean, clear vents. Do not cover with
you hand during operation.
WARNING: Do not at any time let
brake fluids, gasoline, petroleum-based
products, penetrating oils, etc. to come in
contact with plastic parts. Chemicals
can damage, weaken or destroy plastic
which may result in serious personal
injury.
WARNING: When servicing, use
only identical replacement parts. Use of
any other parts may create a hazard or
cause product damage. To ensure safety
and reliability, all repairs should be
performed by a qualified service
technician.

Page 13
NOTES

Page 14
SAVE YOUR RECEIPTS
THIS WARRANTY IS VOID WITHOUT THEM
12 VOLT LITHIUM-ION IMPACT DRIVER
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 power 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 at: 1-866-917-4374. (M-F 8am – 6pm EST)

Page 16
09/2013
© 2013 Menard, Inc., Eau Claire, WI 54703