Power Pro 2100 Series User manual

IMPORTANT!
Please make certain that the person using this equipment carefully reads
and understands these instructions prior to operation.
Instruction
Manual Drywall Sander
Power Pro 2100 Series

Table of Contents
Important Safety Instructions........................................................1
General Safety Rules ...................................................................2
Additional Specific Safety Rules...................................................4
Carton Contents ...........................................................................9
Functional Description..................................................................9
Assembly....................................................................................10
Operation....................................................................................12
Maintenance...............................................................................14
Warranty and Return Policy........................................................16
Contact Information....................................................................17
Important Safety Instructions
Read all warnings and operating instructions before using any tool or
equipment. When using tools or equipment, safety precautions should
always be followed to reduce the risk of personal injury. Improper operation,
maintenance, or modification of tools or equipment could result in serious
injury and property damage. There are certain applications for which tools
and equipment are designed. CORNERSTONE TRADING strongly
recommends that this product NOT be modified and/or used for any
application other than for which it was designed.
Information regarding safe and proper operation is available from:
The Power Tool Institute
1300 Sumner Avenue, Cleveland, OH 44115-2851
www.powertoolinstitute.org
The U.S. Department of Labor regulations
www.osha.gov

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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.
1. WORK AREA SAFETY
a) Keep work area clean and well lit. Cluttered or dark areas invite
accidents.
b) 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.
c) Keep children and bystanders away while operating a power tool.
Distractions can cause you to lose control.
2. ELECTRICAL SAFETY
a) 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.
b) 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.
c) Do not expose power tools to rain or wet conditions. Water entering
a power tool will increase the risk of electric shock.
d) 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.
e) 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.
f) 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.

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3. PERSONAL SAFETY
a) 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.
b) 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.
c) 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 energizing power tools that have the switch on invites
accidents.
d) 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.
e) Do not overreach. Keep proper footing and balance at all times. This
enables better control of the power tool in unexpected situations.
f) 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.
g) 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.
4. POWER TOOL USE AND CARE
a) 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.
b) 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.
c) 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.
d) 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
e) 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.
f) Keep cutting tools sharp and clean. Properly maintained cutting tools
with sharp cutting edges are less likely to bind and are easier to control.
g) 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.
5. SERVICE
a) 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.
ADDITIONAL SPECIFIC SAFETY RULES
Safety Warnings Common for Grinding, Sanding, Wire Brushing,
Polishing or Abrasive Cutting-Off Operations:
a) This power tool is intended to function as a sander. Read all safety
warnings, instructions, illustrations and specifications provided with this
power tool. Failure to follow all instructions listed below may result in
electric shock, fire and/or serious injury.
b) Operations such as polishing, grinding, wire brushing or cutting-off
are not recommended to be performed with this power tool.
Operations for which the power tool was not designed may create a
hazard and cause personal injury.
c) Do not use accessories which are not specifically designed and
recommended by the tool manufacturer. Just because the accessory
can be attached to your power tool, it does not assure safe operation.
d) The rated speed of the accessory must be at least equal to the
maximum speed marked on the power tool. Accessories running
faster than their RATED SPEED can break and fly apart.
e) The outside diameter and the thickness of your accessory must be
within the capacity rating of your power tool. Incorrectly sized
accessories cannot be adequately guarded or controlled.
f) The arbor size of wheels, flanges, backing pads or any other
accessory must properly fit the spindle of the power tool.
Accessories with arbor holes that do not match the mounting hardware of
the power tool will run out of balance, vibrate excessively and may cause
loss of control.

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g) Do not use a damaged accessory. Before each use inspect the
accessory such as abrasive wheels for chips and cracks, backing pad for
cracks, tear or excess wear, wire brush for loose or cracked wires. If
power tool or accessory is dropped, inspect for damage or install an
undamaged accessory. After inspecting and installing an accessory,
position yourself and bystanders away from the plane of the rotating
accessory and run the power tool at maximum no-load speed for one
minute. Damaged accessories will normally break apart during this test
time.
h) Wear personal protective equipment. Depending on application, use a
face shield, safety goggles or safety glasses. As appropriate, wear dust
mask, hearing protectors, gloves and workshop apron capable of
stopping small abrasive or workpiece fragments. The eye protection must
be capable of stopping flying debris generated by various operations.
The dust mask or respirator must be capable of filtrating particles
generated by your operation. Prolonged exposure to high intensity noise
may cause hearing loss.
i) Keep bystanders a safe distance away from work area. Anyone
entering the work area must wear personal protective equipment.
Fragments of workpiece or of a broken accessory may fly away and
cause injury beyond immediate area of operation.
j) Hold power tool by insulated gripping surfaces only, when
performing an operation where the cutting accessory may contact
hidden wiring or its own cord. Cutting accessory contacting a "live"
wire may make exposed metal parts of the power tool "live" and shock
the operator.
k) Position the cord clear of the spinning accessory. If you lose control,
the cord may be cut or snagged and your hand or arm may be pulled into
the spinning accessory.
l) Never lay the power tool down until the accessory has come to a
complete stop. The spinning accessory may grab the surface and pull
the power tool out of your control.
m) Do not run the power tool while carrying it at your side. Accidental
contact with the spinning accessory could snag your clothing, pulling the
accessory into your body.
n) Regularly clean the power tool’s air vents. The motor’s fan will draw
the dust inside the housing and excessive accumulation of powdered
metal may cause electrical hazards.
o) Do not operate the power tool near flammable materials. Sparks
could ignite these materials.
p) Do not use accessories that require liquid coolants. Using water or
other liquid coolants may result in electrocution or shock.
ADDITIONAL SPECIFIC SAFETY RULE

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Kickback and Related Warnings
Kickback is a sudden reaction to a pinched or snagged rotating wheel, backing
pad, brush, or any other accessory. Pinching or snagging causes rapid stalling
of the rotating accessory which in turn causes the uncontrolled power tool to
be forced in the direction opposite of the accessory’s rotation at the point of the
binding.
For example, if a backing pad is snagged or pinched by the workpiece, the
edge of the pad that is entering into the pinch point can dig into the surface of
the material causing the wheel to climb out or kick out. The wheel may either
jump toward or away from the operator, depending on direction of the wheel’s
movement at the point of pinching.
Kickback is the result of power tool misuse and/or incorrect operating
procedures or conditions and can be avoided by taking proper precautions as
given below.
a) Maintain a firm grip on the power tool and position your body and
arm to allow you to resist kickback forces. Always use auxiliary
handle, if provided, for maximum control over kickback or torque reaction
during start-up. The operator can control torque reactions or kickback
forces, if proper precautions are taken.
b) Never place your hand near the rotating accessory. Accessory may
kickback over your hand.
c) Do not position your body in the area where power tool will move if
kickback occurs. Kickback will propel the tool in direction opposite to
the wheel’s movement at the point of snagging.
d) Use special care when working corners, sharp edges etc. Avoid
bouncing and snagging the accessory. Corners, sharp edges or
bouncing have a tendency to snag the rotating accessory and cause loss
of control or kickback.
e) Do not attach a saw chain woodcarving blade or toothed saw blade.
Such blades create frequent kickback and loss of control.
Safety Warnings Specific for Sanding Operations:
1. Do not use excessively oversized sanding disc paper. Follow
manufacturer’s recommendations when selecting sanding paper. Larger
sanding paper extending beyond the sanding pad presents a laceration
hazard and may cause snagging, tearing of the disc or kickback.
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 paint.
•crystalline silica from bricks and cement and other masonry products.
•arsenic and chromium from chemically-treated lumber (CCA).

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Your risk from exposure to these chemicals varies, depending on how often
you do this type of work. To reduce your exposure to these chemicals: work in
a well ventilated area with approved safety equipment, such as dust masks
that are specially designed to filter out microscopic particles.
WARNING: 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, eyes, or lay on the skin may promote
absorption of harmful chemicals.
WARNING: Use of this tool can generate and/or disburse dust, which may
cause serious and permanent respiratory damage or other injury. Always use
NIOSH/OSHA/MSHA approved respiratory protection appropriate for the dust
exposure. Direct particles away from face and body.
WARNING: ALWAYS wear proper personal hearing protection that
conforms to ANSI S12.6 (S3.19) during use. Under some conditions and
duration of use, noise from this product may contribute to hearing loss.
WARNING: ALWAYS USE SAFETY GLASSES. (ANSI Z87.1) and (CAN/CSA
Z94.3) Everyday eyeglasses are NOT safety glasses. Also use face or dust
mask if cutting operation is dusty. ALWAYS WEAR CERTIFIED SAFETY
EQUIPMENT:
•ANSI Z87.1 eye protection (CAN/CSA Z94.3)
•ANSI S12.6 (S3.19) hearing protection
•NIOSH/OSHA/MSHA respiratory protection
MOTOR
Be sure your power supply agrees with nameplate marking. 120 Volts AC
means your tool will operate on alternating current. As little as 10% lower
voltage can cause loss of power and can result in overheating. All PORTER-
CABLE tools are factory-tested; if this tool does not operate, check the power
supply.
WARNING: Accessories must be rated for at least the speed recommended on
the tool warning label. Accessories running over rated speed can fly apart and
cause injury. Accessory ratings must always be above tool speed as shown on
tool nameplate.
WARNING: To reduce the risk of injury, turn unit off and disconnect it
from power source before installing and removing accessories, before
adjusting or when making repairs. An accidental start-up can cause injury.

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SAVE THESE INSTRUCTIONS!
ADDITIONAL SPECIFIC SAFETY RULES FOR
PAINT REMOVAL
1) Sanding of lead based paint is NOT RECOMMENDED due to the difficulty
of controlling the contaminated dust. The greatest danger of lead poisoning
is to children and pregnant women.
2) Since it is difficult to identify whether or not a paint contains lead without a
chemical analysis, we recommend the following precautions when sanding
any paint:
PERSONAL SAFETY
1) No children or pregnant women should enter the work area where the paint
sanding is being done until all clean-up is completed.
2) A dust mask or respirator should be worn by all persons entering the work
area. The filter should be replaced daily or whenever the wearer has
difficulty breathing. See your local hardware store for the proper NIOSH
approved dust mask.
3) NO EATING, DRINKING or SMOKING should be done in the work area to
prevent ingesting contaminated paint particles. Workers should wash and
clean up BEFORE eating, drinking or smoking. Articles of food, drink, or
smoking should not be left in the work area where dust would settle on
them.
ENVIRONMENTAL SAFETY
1. Paint should be removed in such a manner as to minimize the amount of
dust generated.
2. Areas where paint removal is occurring should be sealed with plastic
sheeting of 4 mil thickness.
3. Sanding should be done in a manner to reduce tracking of paint dust
outside the work area.
CLEANING AND DISPOSAL
1. All surfaces in the work area should be vacuumed and thoroughly cleaned
daily for the duration of the sanding project. Vacuum filter bags should be
changed frequently.
2. Plastic drop cloths should be gathered up and disposed of along with any
dust chips or other removal debris. They should be placed in sealed refuse
receptacles and disposed of through regular trash pick-up procedures.
During clean up, children and pregnant women should be kept away from
the immediate work area.
3. All toys, washable furniture and utensils used by children should be
washed thoroughly before being used again.
SAVE THESE INSTRUCTIONS!

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CARTON CONTENTS
Drywall Sander
6 - Sanding Paper (grits 80/100/120/150/180/240)
Flexible Vacuum Hose
Vacuum Hose Adapters
Vacuum Hose Clasp Rings
Handle
Carrying Bag
Extra set of Carbon Brushes (One set is already installed)
Screwdriver
Hexagon Spanner (Allen Wrench)
Washer, Hose Clamp, and Black screws (for sander head installation)
Instruction Manual
FUNCTIONAL DESCRIPTION
The Power Pro 2100 Drywall Sander is designed for sanding walls and ceilings
that are made of drywall or plaster. The Sander provides a superior finish, and
is faster than conventional finishing methods for both new construction and
renovation work. Clean-up time for the Power Pro 2100 is minimized by the
use of an external vacuum cleaner attached to the sander.

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ASSEMBLY
This tool is shipped with the sanding head detached and the extension handle
removed. Minimal assembly time is required and assembly screw driver is
included; no other tools are required.
SANDING HEAD ASSEMBLY
1. With the plastic cover facing up (big hole of plastic cover is up, as shown by
the arrow), place the washer from toolkit bag and set the drive shaft into the
center hole of the aluminum set, then turn clockwise until hand-tight.
2. Insert the included screws through the black support arms and into the
holes of the aluminum set, then hand-tighten with the enclosed screwdriver.

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3. Attach the clamp to the black dust hose, and attach it to the big hole of
plastic cover, then hand-tighten with the enclosed screwdriver.
Finished assembly:
TELESCOPING STEM INSTALLATION
1. Ensure that the Plastic Ring Screw is on the telescoping stem and with the
flat side down (away from the on/off switch), insert the stem into the stem of
the sanding unit.
2. Slide the telescoping stem to the desired length and screw the Plastic Ring
Screw to the unit; hand-tighten.
LARGE HANDLE INSTALLATION

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1. Place handle on to plastic clamp block of the machine
2.Use the hex spanner to fix two screws on two side of the handle
3.Finish assembly
ABRASIVE DISC SELECTION
An abrasive disc set is already included with the Drywall Sander. Lower grit
number is used for first applications to even out tough drywall compound.
Higher grit number results a smoother finish and should be used in final
stages. Hook and loop fasteners will affix the abrasive disc to the sanding
head.

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OPERATION
To reduce the risk of serious personal injury, turn tool off and disconnect
tool from power source before installing and removing accessories,
before adjusting or changing set-ups or when making repairs. An
accidental start-up can cause injury.
HOW TO HOLD A DRYWALL SANDER
Hold the sander with both hands on the main tube/stem. Position your hands
anywhere along the main tube and/or the main handle to provide the best
combination of reach and leverage.
To reduce the risk of personal injury, keep your hands on the main tube. Keep
away from the sanding head area. The sanding head swivels in multiple
directions and can pinch your hand.
CONNECTING THE SANDER TO YOUR SHOP VAC
Furnished with the Drywall Sander are:
A 12' (365 cm) long vacuum hose. This hose has a standard 1-1/4" (3.2 cm)
vacuum cleaner connector. It has a static dissipating feature to dissipate
static electrical charges.
Hose adapters: [1-1/2" (3.8 cm) to 2" (5.1 cm)] to allow the connection of the
sander to the included 2" (5.1 cm) vacuum hose. And [2" (5.1 cm) to 2"
(5.1 cm)] to connect to your vacuum.
INSTALLATION
1. Install a special drywall dust bag into your vacuum cleaner, following the
instructions supplied with the vacuum cleaner. If this dust bag does not fit
your vacuum cleaner correctly, purchase and install a suitable filter bag that
is rated for drywall dust.
To reduce the risk of personal injury, use a dust bag rated for drywall
dust. Failure to do so will increase the level of airborne dust particles in
the work area. Continued and prolonged exposure to high
concentrations of airborne dust may affect your respiratory system
function.
2. Clip the tabbed hose rings, from each end of the hose, into the tab holes of
each adapter.
3. Connect the vacuum hose to the Drywall Sander using the supplied 2-1/2”
(6.4cm) to 2-1/2” (6.4cm) adapter. And connect the vacuum hose to your
vacuum cleaner using the 1-1/4" (3.2 cm) to 2-1/2" (6.4 cm) adapter. If your
vacuum cleaner requires a special connector (something other than the
standard 1-1/4" (3.2 cm) to 2-1/2" (6.4 cm) connectors supplied with the
Drywall Sander), contact your vacuum cleaner supplier for the proper
adapter.
TO START AND STOP THE DRYWALL SANDER

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Be certain that the power circuit voltage is the same as that shown on the
specification plate of the tool, and that the switch is OFF (O). Connect the tool
to the power circuit.
The Drywall Sander is equipped with a “rocker” type switch (A) Fig. 4. The top
end of the switch button is labeled "O" (OFF), and the bottom end of the
button is labeled "I" (ON). To start the sander, press the bottom end of the "I"
switch. To stop the sander, press the top end of the "O" switch.
SPEED CONTROL
The Power Pro Sander is equipped with a variable speed control. Adjust the
speed by turning the control knob, located to the lower left of the Power
Switch. The control knob is numbered “Min, “1” through “5”, and “Max”
The setting “Min” is the slowest speed (approximately 1000 RPM) and “Max” is
the fastest speed (approximately 2,100 RPM).
Use the higher speed settings for fast stock removal. Use the lower speed
setting to reduce removal rate for more precise control.
BRUSH-TYPE SKIRT
A brush-type skirt surrounds the abrasive pad on the Power Pro. This skirt
serves two purposes:
•It extends below the surface of the abrasive pad to prevent the abrasive
from “gouging” the work.
•It helps contain the drywall dust until the vacuum cleaner pulls it away.
Replace the skirt if it is damaged or if it is worn excessively. Replacement
skirts are available by contacting Cornerstone Trading
TO REPLACE A SKIRT
To reduce the risk of serious personal injury, turn tool off and disconnect
tool from power source before installing and removing accessories,
before adjusting or changing set-ups or when making repairs. An
accidental start-up can cause injury.
1. Remove abrasive pad (see Abrasive Pad Replacement).
2. Use the enclosed hex screwdriver to remove the six retaining screws
around the edge of the skirt.
3. Lift the skirt out of housing.
4. Position the new skirt to the housing and install the six retaining screws.
5. Replace the abrasive pad.
SANDING DRYWALL
The Drywall Sander has an articulating sanding head. The head can swivel in
multiple directions, allowing the abrasive pad to conform to the work surface.
This action enables you to sand the top, middle, and bottom of a wall or ceiling
joint without changing position.
1. Turn the vacuum cleaner switch ON (I).

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To reduce the risk of personal injury, ALWAYS wear a respirator
approved by NIOSH for “Dust and Mist”.
1. Turn Drywall Sander switch ON (I).
2. Position the Drywall Sander lightly against the work surface. Apply just
enough pressure to align the sanding head with the work surface.
3. Apply additional pressure to engage the abrasive pad on the work surface.
4. Move the sander in an overlapping pattern to smooth the drywall
compound down to a “featheredge”.
Apply ONLY enough pressure to keep the abrasive pad flat against the work.
Keep the sander in constant motion while the abrasive pad is in contact with
the work surface. Use a steady, sweeping motion. Excessive pressure,
stopping the sander on the work, or moving the sander erratically can cause
unacceptable swirl marks and unevenness in the work surface.
NOTE: Do not allow rotating abrasive pad to contact sharp protrusions.
Contact with protruding objects (nails, screws, electrical boxes, etc.), can
severely damage the abrasive pad.
ABRASIVE PAD REPLACEMENT
To reduce the risk of serious personal injury, turn tool off and disconnect
tool from power source before installing and removing accessories,
before adjusting or changing set-ups or when making repairs. An
accidental start-up can cause injury.
1. Grasp the abrasive pad and the sander housing to prevent pad rotation.
2. Rotate the pad retaining nut counterclockwise and remove.
3. Lift off the abrasive pad.
4. Position the new abrasive pad to the back-up disc, and center the hole of
the disc on the hub of the back-up disc.
5. Position the large metal washer, and the retaining nut, to the sander.
6. Rotate the retaining nut clockwise to hand tighten (while holding the
abrasive pad as described in step 1).
TRANSPORTATION AND STORAGE
Keep the sander dry during transport and storage. Protect the abrasive pad.
Contact with another object may deform the pad, causing it to sand unevenly.
If you cannot protect the pad during transport or storage, remove and store it
separately. Your Power Pro comes with a carrying bag for ease of
transportation.
MMAINTENANCE
AINTENANCE
To reduce the risk of injury, turn unit off and disconnect it from power
source before installing and removing accessories, before adjusting or
when making repairs. An accidental start-up can cause injury.

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ALWAYS USE SAFETY GLASSES. Everyday eyeglasses are NOT safety
glasses. Also use face or dust mask if cutting operation is dusty. ALWAYS
wear certified safety equipment:
• ANSI Z87.1 eye protection (CAN/CSA Z94.3)
• ANSI S12.6 (S3.19) hearing protection
• NIOSH/OSHA/MSHA respiratory protection.
REPAIRS
For assistance with your tool, please email us at
[e-mail]
CLEANING
Periodically blowing dust and chips out of the motor housing using clean, dry
compressed air is a suggested maintenance procedure. To reduce the risk of
serious personal injury, ALWAYS wear ANSI Z87.1 safety glasses while using
compressed air.
When cleaning, use only mild soap and a damp cloth on plastic parts.
Many household cleaners contain chemicals which could seriously damage
plastic. Also, do not use gasoline, turpentine, lacquer, paint thinner, dry
cleaning fluids or similar products which may seriously damage plastic parts.
Never let any liquid get inside the tool; never immerse any part of the tool into
a liquid.
REPLACEMENT PARTS
Use only identical replacement parts. To order parts, please email us at
[e-mail] RVICE
FAILURE TO START
Should your tool fail to start, check to make sure the prongs on the cord plug
are making good contact in the outlet. Also, check for blown fuses or open
circuit breakers in the line.
LUBRICATION
This tool has been lubricated with a sufficient amount of high grade lubricant
for the life of the unit under normal operating conditions. No further lubrication
is necessary.
BRUSH INSPECTION
For your continued safety and electrical protection, brush inspection and
replacement on this tool should be performed at approximately 100 hours of
use.
Using the supplied screwdriver (flat end), remove the carbon brushes from the
brush housing on both sides of the forward motor. This is identified as the
black circular section with a flat screwdriver slot. If worn, swap the brushes
with new ones, supplied, and test the tool for performance.
Any loss of power before the above maintenance check may indicate the need
for immediate servicing of your tool. DO NOT CONTINUE TO OPERATE
TOOL UNDER THIS CONDITION. If proper operating voltage is present,
return your tool to the service station for immediate service.

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MWARRANTY AND RETURN POLICY
All Cornerstone Trading ltd. products are covered by our Money Back or
Replacement Guarantee per the following conditions:
30 DAYS from the date of receipt of the product. If your product becomes
damaged during shipping or is found to be defective in any way during this
period, we will replace your product or issue you a complete refund and we will
pay all shipping costs involved as part of the guarantee. If you feel that the
product has a defect, we will send you a label to return your product, which will
then me inspected by our service department. (Please email us and indicate if
the product was damaged or defective)
90 DAYS Free Parts and Labor guarantee - If your product stops working
during this period, return the product to us and we will repair it with free OEM
parts and no labor charges; shipping to and from to be paid by the buyer.
The Guarantees are only valid in the 48 contiguous states. If you purchase this
product and ship it to a destination outside the 48 contiguous United States,
this guarantee becomes Null and Void.
If you change your mind and do not wish to keep the product, it must be
returned NEW & UNUSED in the original box and you must pay the return
shipping. Please note that there will be a 10% Restocking Fee and your
product CANNOT be returned if it has been used, unless our warranty applies
(see above)
Although all of our products are checked and thoroughly inspected by our
service department before they are shipped to our customers, we strongly urge
you to use/run your product during the first few days of receiving it to make
sure it is in perfect working condition.

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Cornerstone Trading ltd.
4701 Pierce Dr #C2
Lincoln, NE 68504
[e-mail]