241-0356
IMPACT DRIVER
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.
For questions / comments, technical assistance or repair parts –
Please Call Toll Free: 1-866-917-4374 (M-F 8:30am-5:00pm EST).
20V
TABLE OF CONTENTS
Safety Symbols ......................................................... Page 2
Safety Instructions ...................................................... Page 3
Overview/Specications ................................................. Page 7
Assembly ............................................................. Page 8
Operation ............................................................. Page 9
Maintenance .......................................................... Page 13
Troubleshooting ....................................................... Page 14
Parts List ............................................................. Page 15
Schematic Drawing .................................................... Page 16
Warranty .............................................................Page 18
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.
Symbol
Name
Designation / Explanation
V Volts Voltage
A Amps Current
Hz Hertz Frequency (cycles per second)
W Watts Power
lbs
Pounds Weight
n
0
No-load speed Rotational speed at no load
…/min Per minute
Revolutions, strokes, surface speed
orbits, etc., per minute.
RPM
Revolutions per min-
ute
Unit of speed
IPM Impacts per minute Unit of impact frequency
�
or d.c. Direct current Type of characteristic of current
Read instruction
manual
To reduce the risk of injury, user must
read instruction manual.
Warning symbol Do not stare at operating lamp.
WARNING:
To ensure safety and reliability, all repairs should be performed by a
qualified service technician.
Page 3
SAFETY INSTRUCTIONS
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 understand-
ing. 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.
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!
Page 4
SAFETY INSTRUCTIONS
GENERAL POWER TOOL SAFETY
WARNINGS
WARNING:
Read all safety
warnings, instruction, illustrations , and
specifications provided with this power
tool. Failure to follow all instructions listed
below may result in electric shock, re ,
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. Unmodied 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 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 an 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 a power 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
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 nger 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 jewelry. Keep your hair and
clothing away from moving parts. Loose
clothes, jewelry, or long hair can be caught
in moving parts.
Page 5
SAFETY INSTRUCTIONS
7. If devices are provided for the
connection of dust extraction and
collection facilities, ensure these are
connected and properly used. Use of dust
collection 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.
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 remove the battery pack,
if detachable, 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 and accessories.
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,
and 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 re 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 re.
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 re.
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.
5. Do not use a battery pack or tool
that is damaged or modified. Damaged
or modied batteries may exhibit
unpredictable behavior resulting in re,
explosion, or risk of injury.
6. Do not expose a battery pack or tool
to fire or excessive temperature. Exposure
to re or temperature above 212 °F (100 °C)
may cause explosion.
7. Follow all charging instructions and
do not charge the battery pack or tool
outside the temperature range specified
Page 6
SAFETY INSTRUCTIONS
in the instructions. Charging improperly or
at temperatures outside the specied range
may damage the battery and increase the
risk of re.
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.
SAFETY INSTRUCTIONS FOR
IMPACT DRIVER
1. Hold the power tool by insulated
gripping surfaces, when performing an
operation where the fastener may contact
hidden wiring. Fasteners contacting a
“live” wire may make exposed metal parts
of the power tool “live” and could give the
operator an electric shock.
IMPORTANT SAFETY
INSTRUCTIONS
1. To reduce the risk of electric shock or
damage to the chargers and batteries, use
only with the MASTERFORCE
®
20V battery
packs and chargers listed.
Battery pack Charger
252-8029 (1.5Ah)
252-8031 (2.0Ah)
252-8030 (2.5Ah)
252-8003 (2.5Ah)
252-8034 (4.0Ah)
252-8013 (4.0Ah)
252-8035 (5.0Ah)
252-8005 (5.0Ah)
252-8007 (7.5Ah)
252-8014 (8.0Ah)
252-8025
252-8037
252-8026
252-8043
2. For best results, your battery and tool
should be stored, charged, and used in a
location where the temperature is more
than 41°F (5°C) but less than 104°F (40°C).
Do not store outside or in vehicles.
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 upon how often you do this
type of work. To reduce your exposure to
these chemicals:
- Work in a well-ventilated area.
- Work with approved safety equipment,
such as 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.
SAVE THESE INSTRUCTIONS!
Page 7
OVERVIEW
SPECIFICATIONS
Rated Voltage 20 V d.c.
Chuck Capacity Hex 1/4’’
No-load Speed 1: 0 - 400 RPM
2: 0 - 1,800 RPM
3: 0 - 2,500 RPM
4: 0 - 3,600 RPM
Impact Rate 1: 0 - 750 IPM
2: 0 – 2,600 IPM
3: 0 – 3,300 IPM
4: 0 - 4,300 IPM
Maximum Fastening Torque 1: 400 in.lb
2: 1,000 in.lb
3: 1,650 in.lb
4: 2,400 in.lb
Weight (without battery) 2.3 lbs (1.06 kg)
20V
LED Work Light
Speed Control
Panel
Trigger Switch
Chuck
Sleeve
Direction-of-rotation
Selector
Page 8
WARNING:
If any part is broken or
missing, DO NOT attach the battery pack
or operate the tool 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 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 possible serious injury.
WARNING:
Your tool should
never be connected to the battery pack
when you are assembling parts, making
adjustments, installing or removing
bits, cleaning, or when it is not in use.
Disconnecting the tool will prevent
accidental starting, which could cause
serious personal injury.
ASSEMBLY
PACKING LIST
- Cordless impact driver
- Belt clip
- Screw for the belt clip
- PH2 bit
- 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
INSTALLING THE BELT CLIP
(FIG.2)
Belt Clip
Screw
FIG. 2
1. Remove the battery from the tool.
2. Align the rib of the belt clip with the
hole on the base of the driver.
3. Insert the screw and securely tighten
the screw with a screwdriver.
REMOVING THE BELT CLIP
(FIG.2)
1. Remove the battery from the tool.
2. Use a screwdriver to loosen the screw
that attaches the belt clip to the driver.
3. Remove the screw and the belt clip.
TRIGGER SWITCH (FIG. 3)
20V
Trigger
Switch
FIG. 3
1. To turn the impact driver on, depress
the trigger switch.
OPERATION
ATTACH THE BATTERY PACK
(FIG. 1)
Attach
Battery-release
Button
Detach
FIG. 1
1. Make sure that the tool is switched off.
2. Align the raised ribs on the battery
pack with the grooves on the bottom
of the tool, then slide the battery pack
onto the tool.
3. Ensure that the battery-release button
on the battery pack snaps into place
and the battery pack is secured to the
tool before beginning operation.
NOTICE: When placing the battery pack on
the tool, be sure that the raised ribs on the
battery pack align with the grooves on the
tool and the latches snap into place prop-
erly. Improper assembly of the battery pack
can cause damage to internal components.
DETACH THE BATTERY PACK
(FIG. 1)
1. Make sure that the tool is switched off.
2. Press the battery-release button to
release the battery pack.
3. Pull the battery pack to remove it from
the tool.
Page 10
2. To turn the impact driver off, release
the trigger switch.
VARIABLE SPEED
The variable-speed trigger switch delivers
higher speed with increased trigger pressure
and lower speed with decreased trigger
pressure.
DIRECTION-OF-ROTATION SE-
LECTOR (FORWARD/CENTER-
LOCK/ REVERSE) (FIG.4)
FIG. 4
The direction of rotation is reversible and is
controlled by a selector located above the
trigger switch. With the impact 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 to reduce the
possibility of accidental starting when
not in use.
NOTICE: To prevent gear damage, always
allow the impact driver to come to a com-
plete stop before changing the direction of
rotation.
NOTICE: The impact driver will not run un-
less the direction-of-rotation selector is en-
gaged fully to the left or right.
SPEED CONTROL PANEL (FIG. 5)
AUTO
PRESS/HOLD
1
2
3
4
FIG. 5
AUTO
Button
Speed
Indicator Light
Speed Button
AUTO Indicator
Light
The impact driver features the speed button
to select among four different variable-
speed ranges. The proper setting depends
on the job, the bit type, fastener, and
material you are using.
Speed range 1 – the impact driver provides
lowest speed and torque.
Speed range 2 – the impact driver provides
less speed and torque.
Speed range 3 – the impact driver provides
more speed and torque.
Speed range 4 – the impact driver provides
maximum speed and torque.
The impact driver also features the AUTO
button to turn the auto function on and off.
IN FORWARD ROTATION
1. Attach the battery pack to the impact
driver.
2. Position the direction-of-rotation
selector to the left side of the tool for
forward rotation, and briey press the
trigger switch to turn on the speed
indicator light. The speed range will be
set at “4” without auto function.
OPERATION
Page 11
2. Position the direction-of-rotation
selector to the right side of the tool
for reverse rotation, and briey press
the trigger switch to turn on the speed
indicator light. The speed range will be
set at “4” without auto function.
3. Press the speed button to choose one
of the four speed ranges.
4. The speed indicator and auto indicator
lights will automatically turn off within
10-20 minutes after the trigger switch is
released.
NOTE: The speed range will be set at “4”
without auto function each time when you
reattach the battery back.
WARNING:
Watch out for the
auto and speed indicator lights before
operating the tool to reduce the risk of
injury or damage to the workpiece.
OPERATION
RECOMMENDED APPLICATIONS FOR THE COMBINED MODE
Combined Mode
Mode-Indicator
Light
Recommended Applications
Speed 1+ AUTO
AUTO
PRESS/HOLD
1
2
3
4
General use in ultra light duty assembly, not suitable
for self-drilling screws due to low rotation
Speed 2+ AUTO
AUTO
PRESS/HOLD
1
2
3
4
Driving small self-drilling screws into thin metal plate
with good nish
Speed 3+ AUTO
AUTO
PRESS/HOLD
1
2
3
4
Driving small-medium self-drilling screws into thin
metal plate with good nish
Speed 4+ AUTO
AUTO
PRESS/HOLD
1
2
3
4
Tighten bolts without over-torque
3. Press the speed button to choose one
of the four speed ranges.
4. Press the AUTO button to use the
forward auto-stop function. When
the bolt/nut is sufciently tight, the
tool automatically stops the impact
and rotation after approximately one
second. To turn off the auto-stop
function, press the AUTO button again.
The auto-stop function is available only
when the tool is operated in forward
rotation.
5. The speed indicator and auto indicator
lights will automatically turn off within
10-20 minutes after the trigger switch is
released.
IN REVERSE ROTATION
1. Attach the battery pack to the impact
driver.
Page 12
LED WORK LIGHTS (FIG. 6)
The three LED work lights, located around
the chuck of the impact driver, will illuminate
when the trigger switch is depressed. These
provide additional light on the surface of the
workpiece for operation in lower-light areas.
There are two modes of the LED work lights:
a. LED Light mode
The lights will automatically turn off
within 10 seconds after the trigger is
released.
b. LED Flashlight mode
Hold the AUTO button for 1.5s and the
LED lights on the tool will blink twice to
indicate that the LED ashlight mode
is activated. The lights will keep on for
10 minutes. User can hold the AUTO
button for 1.5s again to deactivate the
LED ashlight mode and then the LED
lights will turn off.
NOTE: User can still activate or deactivate
the auto function while the LED ashlight
mode is active or deactive.
ELECTRIC BRAKE
To stop the impact driver, release the trigger
switch and allow the drive to come to a
complete stop. The electric brake helps to
quickly stop the drive. This feature engages
automatically when you release the trigger
switch.
OPERATION
INSTALLING BITS (FIG.7)
FIG. 7
1. Lock the trigger switch on the impact
driver by placing the direction-of-
rotation selector in the center position.
2. Insert the bit into the chuck. You will
hear a “click” to indicate that the bit is
securely installed in place.
3. Pull on the bit to check if it installed
securely.
REMOVING BITS (FIG.8)
20V
Sleeve
FIG. 8
1. Lock the trigger switch on the impact
driver by placing the direction-of-
rotation selector in the center position.
2. Pull the sleeve towards the front of the
tool, and then simply pull out the bit.
FIG. 6
Page 13
MAINTENANCE
1. Check for damaged, missing, or worn
parts.
2. Check for loose screws, misalignment
or binding of moving parts, or any other
condition that may affect the operation.
3. If abnormal vibration or noise occurs,
turn the tool off immediately and have
the problem corrected before further
use.
OPERATION
WARNING:
• When servicing, use only identical
replacement parts. Use of any other parts
may create a hazard or cause product
damage.
• To avoid serious personal injury,
always remove the battery pack from the
product when cleaning or performing any
maintenance.
• 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.
• Using compressed air may be the most
effective cleaning method. Always wear
safety goggles when cleaning tools with
compressed air.
TIGHTENING AND LOOSENING
SCREWS
1. Install the correct bit.
2. Apply just enough pressure to keep the
bit engaged on the screw.
3. Apply minimal pressure to the trigger
switch initially. Increase the speed only
when full control can be maintained.
TIGHTENING AND LOOSENING
NUTS AND BOLTS
Variable speed control must be used with
caution for driving nuts and bolts with
socket set attachments. The best technique
is to start slowly, increasing speed as the
nut or bolt runs down. Set the nut or bolt
snugly by slowing the tool to a stop. If this
procedure is not followed, the tool will have
a tendency to torque or twist in your hands
when the nut or bolt seats.
Page 14
TROUBLESHOOTING
PROBLEM POSSIBLE CAUSE SOLUTION
The impact driver does not
work.
Battery is depleted. Charge the battery pack.
Battery or the tool is
overheated.
Allow the battery or the tool to
cool down.
The tool is overloaded.
Restart the tool and do not force
the tool.
The forward auto-stop
function can’t be obtained
effectively during operation.
Improper applications are
selected.
Refer to the chart listed
in the “RECOMMENDED
APPLICATIONS FOR THE
COMBINED MODE” section.
Motor is overheating.
The cooling vents may be
obstructed.
Clean and clear the vents. Do
not cover the vents with your
hand during operation.
PARTS LIST
No. Part Name No. Part Name
1 Rubber Stick
18 Output Shaft
2 Rotor
19 O Ring
3 Ball Bearing
20 Spring
4 Pinion
21 Small Washer
5 Stator
22 Steel Ball
6 F/R Button
23 Output Shaft Bush
7 Rear Gear Case
24 Circlips For Shaft
8 Paper Gasket
25 Hexagon Lobular Tapping Screw
9 Bearing
26 Main Electric Assembly
10 Rubber Ring
27 Rubber Push Button
11 Impact Block Assembly
28 Cover Plate
12 Ring Gear
29 Indicator Label
13 Washer 30 L R Housing Set
14 Front Gear Housing Assembly 31 Hexagon Lobuar Screw
15 LED Electric Assembly 32 Hook
16 Lamp Housing 33 Screw
17 Decorative Cover 34 Screw Bit
SCHEMATIC DRAWING
NOTES
Impact Driver
12/2024
© 2024Menard, Inc., Eau Claire, WI 54703
