241-0805
Random Orbit Sander
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 10
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.
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
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 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.
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
KNOW THE TOOL
Carefully read this operating manual and
all labels before using this tool. Keep this
manual available for future reference.
IMPORTANT
This tool should only be serviced by a
qualified service technician. For more
information, call the toll free helpline at
1-866-917-4374.
READ ALL INSTRUCTIONS THOROUGHLY.
GENERAL SAFETY RULES FOR
POWER TOOLS
WARNING:
To reduce the risk of
injury, the user must read the Owner’s
Manual.
WARNING:
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 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.
1 20V ~ 6 0 H z
Page 5
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.
SAFETY INSTRUCTIONS
6. If operating a power tool in a damp
location is unavoidable, use a power
supply that is protected by a ground fault
circuit interrupter (GFCI). The 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.
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 that these are
connected and properly used. Use of
these devices can reduce dust-related
hazards.
Page 6
SAFETY INSTRUCTIONS
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.
SPECIFIC SAFETY RULES
FOR SANDER
1. Hold the tool by the 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.
2. Always wear safety goggles and a
dust mask when sanding, especially
when sanding over-head.
3. A suitable breathing respirator must
be worn while sanding chemically
pressure treated objects.
4. The machine is not suitable for wet
sanding.
5. Do not use sanding paper larger than
needed. Extra paper extending beyond the
sanding pad can cause serious lacerations.
6. Secure the workpiece. A workpiece
clamped with clamping devices or in a vice
is held more secure than by hand.
7. Attach the dust box to the tool and
empty it frequently. Do not throw sanding
dust on an open fire because materials in
fine particle form may be explosive.
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 ce-
ment and other masonry products, and
• Arsenic and chromium from chemically-
treated lumber.
Your risk from these exposures varies, de-
pending 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
WARNING:
Do not allow familiarity with your random orbit sander to make you
careless. A fraction of a second of carelessness is enough to cause severe injury.
Dust-sealed ON/OFF rocker switch
Cord guard
Sanding pad
Speed selector
Dust box
SPECIFICATIONS
Motor 120 V 60 Hz 2.8 A
Speed 7000–13000 OPM (no load)
Pad size 5”
Pad type
Hook and loop fastening system with
8 holes
Weight 3 lbs. 12 oz. (1.68 kg)
Page 8
ASSEMBLY
CONTENTS
Sander, sanding discs (5pcs), dust box, soft
bag and operator’s manual
Remove the random orbit sander from the
carton and examine it carefully. Do not
discard the carton or any packaging
material until all parts have been examined.
If any part of the sander is missing or
damaged, do not plug the sander in until
the damaged part is repaired or replaced.
WARNING:
To avoid injury,
ALWAYS turn the switch to the OFF
position and disconnect the random orbit
sander from the power outlet before
installing or changing the abrasive discs
or dust bag attachment.
INSTALLING AND REMOVING
THE ABRASIVE DISC (FIG. 1)
To install:
1. Remove all sanding dust or dirt from
the sanding pad.
2. Align the holes on the abrasive disc
with the holes in the sanding pad,
making sure it is centered and that the
edges are aligned with the edges of
the sanding pad.
NOTICE: The holes in the abrasive disc
must line up with the holes in the sanding
pad in order for the dust collection system
to function properly.
3. Press the abrasive disc to the pad.
To remove:
1. Peel the disc off the sanding pad.
INSTALLING AND REMOVING
THE DUST BOX (FIG. 2)
To attach the dust box (Fig. 2):
1. Unplug the sander.
2. Align the raised rib on the dust box with
the grooves of the sander, and then
attach the dust box to the sander.
NOTICE: Make sure that the dust box
is secured to the tool before beginning
operation.
To detach the dust box:
1. Unplug the sander.
2. Pull up on the dust box and remove it
from the tool.
NOTICE: When placing the dust box on
the tool, be sure that the raised rib on the
dust box aligns with the groove on the
sander and that the dust box snaps into
place properly. Improper attachment of
the dust box can cause damage to
internal components.
FIG. 1
ATTACH
DETACH
FIG. 2
Page 9
ASSEMBLY
To empty dust box drawer (Fig. 3–4)
1. Press the release button on the dust
box door and open the door fully
(Fig. 3).
2. Pull out the dust drawer and empty it
(Fig. 4).
3. Put the dust drawer back into the dust
box. Close the dust box door, making
sure the released button is engaged
securely.
DUST-SEALED ON/OFF
ROCKER SWITCH
This random orbit sander is equipped
with an ON/OFF rocker switch that is
located on the front of the handle.
1. To turn the sander ON, push the I side
of the rocker switch.
2. To turn the sander OFF, push the O
side of the rocker switch.
SPEED SELECTOR (FIG. 5)
Use a practice piece of material to
determine the right speed for each job.
Vary the speed in order to find the best
speed for the accessory that you are
using and the job to be done.
FIG. 3
FIG. 5
FIG. 4
Page 10
OPERATION
GENERAL SANDING
WARNING:
Finish sanding can
produce clouds of fine sanding dust that
could ignite in the presence of sparks or
an open flame. To avoid injury, always use
your sander in a well-ventilated area.
WARNING:
For your safety, and in
order to avoid damage, only turn the
sander ON and OFF when the sander is
contacting a surface.
1. Place the sander on the workpiece
BEFORE turning the switch to the ON
position. If the sander is started before
making contact with the workpiece,
the free-floating workpad may cause
scratches.
2. Sand using a circular or elliptical
motion while applying slight pressure.
3. Random orbit sanders can be moved
across the workpiece in any direction.
If you are sanding wood, you can
sand in any direction, regardless of
the grain of the wood.
4. The amount of downward pressure
will affect the rotation speed and the
sanding results:
a. Light pressure: recommended for
fine work.
b. Moderate pressure: recommended
for rough work.
c. Heavy pressure: not recommended;
does not allow the disc to rotate
properly.
5. Keep the sanding disc flat on the
workpiece. Using the edges of the pad
or tipping the sander may cause an
uneven finish, and may reduce the life of
the sanding pad.
6. Keep the sander moving in broad, even
strokes across the workpiece. Sanding
in one spot for too long may cause
gouging and uneven results.
7. Random orbit sanders work more
aggressively than simple orbital sanders.
Check your workpiece frequently.
8. Begin sanding with a coarser grit
sandpaper and gradually use finer and
finer grits until the desired finish is
achieved. Do not switch from a coarse
grit to a very fine grit in one step.
SANDING OPERATION
WARNING:
To avoid injury, always
unplug the sander before attaching or
removing sanding discs or the dust box.
1. Attach the sanding disc and the dust
box.
2. Place the sander on the workpiece,
and turn the sander ON.
3. Keep the sanding disc flat on the
workpiece and constantly moving
across the workpiece. Use long,
sweeping circular or elliptical strokes.
4. When you are finished sanding, switch
the tool OFF and wait until the sander
has come to a complete stop before
removing it from the workpiece.
REMOVING PAINT OR VARNISH
1. When removing several layers of paint
or varnish, remove as much as possible
with a paint or varnish remover.
2. Scrape the residue off with a putty
knife or scraping tool, and allow the
surface to cool and dry before sanding.
3. Select and install a coarse grit
sandpaper.
4. Keep the sander moving over new areas
in order to avoid heating and softening
the old coating.
5. Work in wide, overlapping strokes in
order to achieve a uniform finish.
6. As the workpiece begins to show through
the old coating, switch to a medium grit
sandpaper in order to avoid scratching
the surface. Gradually switch to a finer
grit until you achieve the desired finish.
Page 11
SANDPAPER SELECTION
(PURCHASE SEPARATELY)
Sandpaper can be made from various grit
materials. The grit material and coarseness
of the sandpaper should be selected
according to the type of workpiece.
WORKPIECE MATERIAL GRIT MATERIAL
Fine woodwork Gamet or aluminium oxide
Rough woodwork Aluminium zirconia or ceramic
Manufactured wood products Silicon carbide or aluminium oxide
Solid surfacing material Silicon carbide or aluminium oxide
Metals Emery or aluminium oxide
Sandpaper is also graded according to
coarseness. Start your work with an
abrasive grit that is just coarse enough
to remove the high spots and excessive
roughness. Follow with a second sanding,
using a grit that is one or two grades
finer. Continue with successively finer
grits until you achieve the desired finish.
Do not switch from a coarse grit to a very
fine grit in one step. It may be difficult to
remove the marks made by the coarse
grit. Use the coarsest grits for the roughing
operation, and finish by using successively
finer grits.
GRIT PURPOSE
Coarse Grit 60–80
Initial sanding on rougher surfaces.
For fast stock removal.
Rough sanding and stripping of painted and rusted
surfaces.
Medium Grit 100–140
Intermediate sanding.
Removal of minor surface imperfections.
Fine Grit 150–220
Fine sanding.
Sanding prior to staining, priming, or sealing.
OPERATION
Page 12
MAINTENANCE
Before each use inspect the random
orbit sander, the ON/OFF switch, and the
cord for damage. Check for damaged,
missing, or worn parts. Check for loose
screws, misalignment or binding of
moving parts, or any other condition that
may affect the operation. If abnormal
vibration or noise occurs, turn the tool
off immediately, and have the problem
corrected before further use.
If the supply cord is damaged, it must be
replaced by a specially prepared cord
available through the service organization.
The tool should be unplugged from the
power supply before cleaning or
performing any maintenance. Using
compressed air may be the most
effective cleaning method. Always wear
safety goggles when cleaning tools with
compressed air.
WARNING:
Do not let brake fluids,
gasoline, petroleum-based products,
penetrating oil, etc., come into contact
with plastic parts. They contain chemicals
that can damage, weaken, or destroy
plastic.
WARNING:
When servicing, use
only identical replacement parts. The use
of any other parts may create a hazard or
cause damage to the product.
WARNING:
Use only accessories
that are recommended for your model by
the manufacturer. Accessories that may
be suitable for one tool may become
hazardous when used on another tool.
WARNING:
Maintain tools with
care. Properly maintained tools work to
their best advantage and are easier to
control.
WARNING:
To ensure safety and
reliability, all repairs should be performed
by a qualified service technician.
WARNING:
If the supply cord is
damaged, it must be replaced by a
specially prepared cord available through
the service organization.
REPLACING THE
SANDER BASE PAD
WARNING:
Failure to unplug the
tool from the power source when
assembling parts, making adjustments,
or changing application tools could
result in accidental starting and cause
serious injury.
1. Unplug the sander.
2. Loosen the 4 screws on the base pad
with a Philips screwdriver (available sep-
arately). Remove the base pad from the
sander (Fig. 6).
3. Remove the bearing cover from the base
pad.
4. Clean and empty the dust that has
accumulated in the sander with a brush
or compressed air.
FIG. 6
Bearing cover
5. Press the bearing cover down onto the
new base pad. Make sure that the 4
holes on the bearing cover are aligned
with the 4 mounting holes on the base
pad.
6. Place the sander upside-down and
attach the new base pad to the sander.
Page 13
TROUBLESHOOTING
PROBLEM
CAUSE
SUGGESTED CORRECTIVE ACTION
This sander will
not start.
The sander is not plugged
into a power source.
Plug the sander into a power source.
7. Tighten the 4 screws with a Philips
screwdriver.
NOTICE: Using compressed air may be the
most effective cleaning method. Always
wear safety goggles when cleaning tools
with compressed air.
NOTICE: Apply some lubricant on the sides
of the base pad for prolonged tool life.
MAINTENANCE
Page 14
SAVE YOUR RECEIPTS
THIS WARRANTY IS VOID WITHOUT THEM
RANDOM ORBIT 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 at: 1-866-917-4374. (M-F 8:30am-5:00pm Est.)
Page 15
08/2014
© 2014 Menard, Inc., Eau Claire, WI 54703
/