241-0439
Random Orbital Sander
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).
TABLE OF CONTENTS
Safety Symbols ......................................................... Page 2
Safety Instructions ...................................................... Page 3
Overview/Specifications ................................................. Page 7
Assembly ............................................................. Page 8
Operation ............................................................ Page 11
Maintenance .......................................................... Page 12
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.
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
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.
WARNING:
To ensure safety and reliability, all repairs should be performed by a
qualied 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 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 following all instructions listed below may result in
electric shock, re, 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
specications provided with this power
tool.
Failure to follow all instructions listed below
may result in electric shock, fire and/or seri-
ous 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 ammable 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 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 inuence 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 finger on the
switch or energising 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 ontrol of the power tool in
unexpected situations.
Page 5
SAFETY INSTRUCTIONS
6. Dress properly. Do not wear loose
clothing or jewellery. Keep your hair and
clothing 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 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.
SERVICE
1. Have your power tool serviced by a
qualied repair person using only identical
replacement parts. This will ensure that the
safety of the power tool is maintained.
SPECIFIC SAFETY WARNINGS
1. Hold power tools by insulated gripping
surfaces when performing an operation
where the cutting tool may contact hidden
wiring. Contact with a” live” wire will make
exposed metal parts of the tool live and
shock the operator.
2. Take protective measures when dust
can develop during working that is harmful
to one’s health, combustible or explosive.
Example: Some dusts are regarded as
carcinogenic. Wear a dust mask and work
with dust/chip extraction when connectable.
3. Use the machine only for dry sanding.
Penetration of water into the machine
increases the risk of an electric shock.
4. Secure the workpiece. A workpiece
clamped with clamping devices or in a vice
is held more secure than by hand.
Page 6
SAFETY INSTRUCTIONS
5. To reduce the risk of electric shock or
damage to the charger and battery, use
only the batteries and charger listed.
Battery pack Charger
252-8027
252-8029
252-8030
252-8031
252-8034
252-8035
252-8026
252-8025
252-8036
252-8037
252-8044
6. Make sure the sandpaper is not
contacting the workpiece before the on/
off rocker switch is in the ON position.
7. Make sure the sander is off before
detaching the battery pack, check the
switch is off before attaching the battery
pack.
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
re¬productive 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.
Page 7
OVERVIEW
SPECIFICATIONS
No-load Speed 7000~11000 OPM
Orbital Diameter 1/8” (3 mm)
Pad Size 5” (125 mm)
Weight 2 lb. 11 oz. (1.23 kg)
Vacuum
Adapter
Dust Bag
On/off
Switch
Base Pad
Page 8
ASSEMBLY
WARNING:
If any part is broken
or missing, DO NOT attempt to attach the
battery 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 modication is misuse
and could result in a hazardous condition
leading to possible serious injury.
WARNING:
Your tool should never
be connected to the battery when you are
assembling parts, making adjustments,
installing or removing blades, cleaning, or
when it is not in use. Disconnecting the
tool will prevent accidental starting, which
could cause serious personal injury.
ASSEMBLY
CONTENTS
Random orbital sander, dust bag, 5pcs
sanding paper, 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.
TO ATTACH BATTERY
PACK (FIG. 1)
Make sure that the sander is switched
off. Align the raised rib on the battery pack
with the grooves on the sander, and then
slide the battery pack onto the sander.
NOTICE: Make sure that the latch on the
battery pack snaps into place and the bat-
tery pack is secured to the sander before
operation.
TO DETACH BATTERY
PACK (FIG. 1)
1. Make sure that the sander is switched
off.
2. Depress the battery-release buttons
located on the front of the battery pack
to release the battery pack.
3. Pull the battery pack out and remove it
from the sander.
Release Button
Attach
Detach
FIG. 1
Page 9
TO ATTACH VACUUM
ADAPTOR (FIG. 2)
The vacuum adapter allows you to connect
a 2-1/2 in. diameter vacuum hose to help
keep the work area clean.
To install:
1. Detach the battery pack from the
sander.
2. Align the raised rib of the dust-exhaust
port with the groove of the vacuum
adaptor (FIG. 2).
3. Slide the vacuum adaptor forward and
push it onto the dust-exhaust port until
it is firmly seated.
NOTICE: From time to time, clean the vac-
uum adaptor with a dry brush.
To remove:
1. Detach the battery pack from the
sander.
2. Grip the adaptor firmly and pull it out
from the tool.
ATTACHING THE DUST BAG TO
THE ADAPTOR
WARNING:
Do not use the dust
bag when sanding metal. Using the dust
bag when sanding metal creates a re haz-
ard, which could damage the tool and lead
to serious personal
WARNING:
Collected sanding dust
from sanding surface coatings such as
polyurethanes, linseed oil, etc., can self-
ignite in the sander dust bag or elsewhere
and cause re. To reduce the risk of re, al-
ways empty the dust bag frequently while
sanding and never store or leave a sander
without totally emptying its dust bag. Also
follow the recommendations of the coating
manufacturers.
Your sander is supplied with a dust-
collecting bag to help you keep the working
area clean. The dust bag is ideal for smaller
jobs.
To install:
1. Detach the battery pack from the
sander.
2. Align the indicators on the vacuum
adaptor and the dust bag.
3. Slide the dust bag forward and push
it onto the adaptor. Rotate the bag
clockwise to lock it in place (FIG. 3).
ASSEMBLY
Groove
Raised Rib
FIG. 2
Lock
Unlock
Indicators
FIG. 3
Page 10
ASSEMBLY
NOTICE: From time to time, remove the
dust bag from the sander and clean the
dust bag with a dry brush.
To remove:
1. Detach the battery pack from the
sander.
2. Grip the dust bag firmly, rotate it
counterclockwise, and pull it out from
the tool (FIG. 3).
ATTACHING THE SANDPAPER
WARNING:
Always inspect the
sandpaper before attaching it to the sand-
er. Do not use the paper if it is torn or de-
fective.
1. Detach the battery pack from the
sander.
2. Place the sander upside down on a flat
surface.
3. Remove any dust or debris from the
sanding pad.
4. Align the holes of the sandpaper with
the holes in the sanding pad and firmly
press the sandpaper against the sanding
pad to ensure a good attachment.(FIG.
4)
SELECTING THE SANDPAPER
GRADE
• Different grades of sandpaper can be
purchased from the store where you
purchased the tool.
• Available grades are: Coarse, Medium
and Fine.
• Use a coarse grit to sand rough finishes,
medium grit to smooth the work, and fine
grit for finish sanding.
• It is best to make a trial run on a scrap
piece of material to determine the
optimum grades of sandpaper for a
particular job.
FIG. 4
Page 11
OPERATION
TURNING THE SANDER ON/OFF
(FIG. 5)
To turn on the sander, depress the side of
the rocker switch marked “I”.
To turn it off, depress the side of the rocker
switch marked “O”.
VARIABLE-SPEED
DIAL (FIG. 6)
The variable-speed feature on this sander
allows you to match the proper speed to the
material being sanded.
1. The variable-speed dial is used to adjust
the speed of the sander.
2. Turn the dial to increase or decrease the
speed of the tool (FIG. 6).
3. Position “1” selects the slowest
speed; position “6” selects the fastest
speed. Adjust the speed for optimum
performance.
SANDING
This sander can be used for most sanding
operations on materials such as wood,
plastic, and painted surfaces. Do not use
this sander for wet sanding.
1. Attach the battery.
2. Place the sander on the workpiece so
that the sandpaper is fully in contact
with the workpiece.
3. Start the sander.
4. For best sanding results, apply light
pressure on the sander, but do not force
the tool.
5. Move the sander slowly over the
workpiece, making successive passes
in parallel lines, circles, or crosswise
movements. The removal rate and the
sanding pattern are determined by the
choice of sandpaper and the material
being sanded.
6. Do not sand in one spot too long, as the
sander’s rapid action may remove too
much material and make the surface
uneven.
7. Upon completion of the sanding
operation, remove the sander from the
workpiece, turn the sander off and wait
until it comes to a complete stop before
putting it down.
FIG. 5
Variable-speed
Dial
FIG. 6
Page 12
WARNING:
Always wear safety
goggles or safety glasses with side shields
during power tool operations, or when
blowing dust. If operation is dusty, also
wear a dust mask.
WARNING:
Do not at any time let
brake uids, gasoline, petroleum-based
products, penetrating oils, etc. come in
contact with plastic parts. Chemicals can
damage, weaken or destroy plastic, which
may result in serious personal injury.
MAINTENANCE
From time to time, remove the dust bag from
the sander and clean the dust bag with a dry
brush.
The tool may be cleaned most effectively
with compressed dry air. Always wear
safety goggles when cleaning tools with
compressed air.
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.
BEFORE EACH USE
1. Inspect the sander, the on/off switch
and the accessories for damage.
2. Check for damaged, missing, or worn
parts.
3. Check for loose screws, misalignment
or binding of moving parts, or any other
condition that may affect the operation.
4. If abnormal vibration or noise occurs,
turn the tool off immediately and have
the problem corrected before further
use.
5. Detach the battery from the sander
before cleaning or performing any
maintenance. Using compressed air
may be the most effective cleaning
method.
MAINTENANCE
6. Always wear safety goggles when
cleaning tools using compressed air.
LUBRICATION
All of the bearings in this tool are lubricated
with a sufficient amount of high grade
lubricant for the life of the unit under normal
conditions. Therefore, no further lubrication
is required.
REPLACE THE BASE PAD
1. Remove four screws on the base pad,
and then detach the cap from the base
pad.
2. Align four holes on the cap with four
holes on the base pad, and then insert
the cap into the new base pad.
3. Place the new base pad on the cap base
with four holes on the base pad aligned
with four holes on the cap base.
4. Retighten four screws on the base pad.
NOTICE: Sanding pad (236-0805, MASTER-
FORCE®) can be a replacement for the pad
of this random orbital sander.
WARNING:
Detach the battery
from the sander before replacing the base
pad.
Screw
Base Pad
Cap
Cap Base
FIG. 7
Page 13
TROUBLESHOOTING
PROBLEM CAUSE SOLUTION
The sander does not work. The battery is depleted. Charge the battery.
The sander doesn’t collect
the dust as expected.
The dust bag is full. Clean the dust bag.
The sandpaper is not
properly attached and the
holes are not aligned.
Reattach the sandpaper with
the holes properly aligned.
Page 14
SAVE YOUR RECEIPTS
THIS WARRANTY IS VOID WITHOUT THEM
Random Orbital Sander
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: 1-866-917-4374 (M-F 8:30am – 5:00pm EST).
08/2018
© 2018 Menard, Inc., Eau Claire, WI 54703
