1/4″ Die Grinder
WarninG: to prevent serious injury, user must read and understand
Owner’s Manual. SaVe tHiS ManuaL.
When unpacking, make sure that the product is intact and undamaged.
If any parts are missing or broken, please call 1‑888‑866‑5797
as soon as possible. Reference 56932.
Owner’s Manual &
Safety Instructions
24d
Model
He64
Page 2 For technical questions, please call 1-888-866-5797. Item 56932
SaFety OperatiOn MaintenanceSetup
IMPORTANT SAFETY INFORMATION
General Power Tool Safety Warnings
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.
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 grounded
power tools. Unmodified plugs and matching
outlets will reduce risk of electric shock.
2. avoid body contact with grounded surfaces
such as pipes, radiators, ranges and
refrigerators. There is an increased risk of
electric shock if your body is 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 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 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 safety equipment. always wear eye
protection. Safety 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
the switch/trigger 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
these are connected and properly used. Use of
these devices can reduce dust-related hazards.
8. Only use safety equipment that has been approved
by an appropriate standards agency. Unapproved
safety equipment may not provide adequate
protection. Eye protection must be ANSI‑approved
and breathing protection must be NIOSH‑approved
for the specific hazards in the work area.
Page 3For technical questions, please call 1-888-866-5797.Item 56932
SaFetyOperatiOnMaintenance Setup
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/trigger
does not turn it on and off.
Any power tool that cannot be controlled with the
switch/trigger is dangerous and must be repaired.
3. Disconnect the plug from the power source
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 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.
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. Maintain labels and nameplates on the
tool. These carry important safety information.
If unreadable or missing, contact
Harbor Freight Tools for a replacement.
Safety Warnings Common for
Grinding, Sanding, Wire Brushing,
or Polishing Operations
1. this power tool is intended to function as a
grinder, sander, wire brush, or polisher. 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.
2. Operations such as 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.
3. 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.
4. 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.
5. 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.
6. 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.
7. Do not use a damaged accessory.
Before each use inspect the accessory such
as 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.
8. Wear personal protective equipment. Depending
on application, use 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 eye protection must
be capable of stopping flying debris generated by
various operations. The dust mask or respirator
must be capable of filtering out particles generated
by your operation. Prolonged exposure to high
intensity noise may cause hearing loss.
9. 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.
Page 4 For technical questions, please call 1-888-866-5797. Item 56932
SaFety OperatiOn MaintenanceSetup
10. Hold power tool by insulated gripping surfaces
only, when performing an operation where
the accessory may contact hidden wiring
or its own cord. An accessory contacting a
″live″ wire may make exposed metal parts of
the power tool ″live″ and shock the operator.
11. 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.
12. always hold the tool firmly in your
hand(s) during the start-up. The reaction
torque of the motor, as it accelerates to
full speed, can cause the tool to twist.
13. use clamps to support workpiece whenever
practical. never hold a small workpiece in
one hand and the tool in the other hand while
in use. Clamping a small workpiece allows you
to use your hand(s) to control the tool. Round
material such as dowel rods, pipes or tubing
have a tendency to roll while being cut, and
may cause the bit to bind or jump toward you.
14. 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.
15. after changing the bits or making any
adjustments, make sure the collet nut, chuck
or any other adjustment devices are securely
tightened. Loose adjustment devices can
unexpectedly shift, causing loss of control, loose
rotating components will be violently thrown.
16. 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.
17. 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.
18. Do not operate the power tool near flammable
materials. Sparks could ignite these materials.
19. Do not use accessories that require liquid
coolants. Using water or other liquid coolants
may result in electrocution or shock.
20. Avoid unintentional starting.
Prepare to begin work before turning on the tool.
21. Do not leave the tool unattended when it is plugged
into an electrical outlet. Turn off the tool, and
unplug it from its electrical outlet before leaving.
22. Use clamps (not included) or other practical
ways to secure and support the workpiece to
a stable platform. Holding the work by hand
or against your body is unstable and may
lead to loss of control and personal injury.
23. This product is not a toy.
Keep it out of reach of children.
24. People with pacemakers should consult their
physician(s) before use. Electromagnetic fields in
close proximity to heart pacemaker could cause
pacemaker interference or pacemaker failure.
In addition, people with pacemakers should:
• Avoid operating alone.
• Do not use with power switch locked on.
• Properly maintain and inspect
to avoid electrical shock.
• Properly ground power cord. Ground Fault Circuit
Interrupter (GFCI) should also be implemented
– it prevents sustained electrical shock.
25. The warnings, precautions, and instructions
discussed in this instruction manual cannot
cover all possible conditions and situations
that may occur. It must be understood by the
operator that common sense and caution are
factors which cannot be built into this product,
but must be supplied by the operator.
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 an abrasive wheel is snagged or
pinched by the workpiece, the edge of the wheel 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. Abrasive wheels
may also break under these conditions.
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.
1. 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.
2. never place your hand near the
rotating accessory. Accessory may
kickback over your hand.
3. 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.
4. 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.
Page 5For technical questions, please call 1-888-866-5797.Item 56932
SaFetyOperatiOnMaintenance Setup
5. 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 Grinding
1. For threaded abrasive cones and plugs
use only undamaged wheel mandrels with
an unrelieved shoulder flange that are of
correct size and length. Proper mandrels
will reduce the possibility of breakage.
2. Do not position your hand in line with
and behind the rotating accessory. When
the accessory, at the point of operation, is
moving away from your hand, the possible
kickback may propel the spinning accessory
and the power tool directly at you.
Safety Warnings Specific
for Sanding Operations
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.
Safety Warnings Specific for
Wire Brushing Operations
1. Be aware that wire bristles are thrown by
the brush even during ordinary operation.
Do not overstress the wires by applying
excessive load to the brush. The wire bristles
can easily penetrate light clothing and/or skin.
2. if the use of a guard is recommended for
wire brushing, do not allow any interference
of the wire wheel or brush with the guard.
Wire wheel or brush may expand in diameter
due to work load and centrifugal forces.
Vibration Safety
This tool vibrates during use. Repeated or
long‑term exposure to vibration may cause
temporary or permanent physical injury,
particularly to the hands, arms and shoulders. To
reduce the risk of vibration‑related injury:
1. Anyone using vibrating tools regularly or for an
extended period should first be examined by a
doctor and then have regular medical check‑ups
to ensure medical problems are not being caused
or worsened from use. Pregnant women or
people who have impaired blood circulation to
the hand, past hand injuries, nervous system
disorders, diabetes, or Raynaud’s Disease should
not use this tool. If you feel any medical or
physical symptoms related to vibration (such as
tingling, numbness, and white or blue fingers),
seek medical advice as soon as possible.
2. Do not smoke during use. Nicotine reduces
the blood supply to the hands and fingers,
increasing the risk of vibration‑related injury.
3. Wear suitable gloves to reduce the
vibration effects on the user.
4. Use tools with the lowest vibration when there
is a choice between different processes.
5. Include vibration‑free periods each day of work.
6. Grip tool as lightly as possible (while still keeping
safe control of it). Let the tool do the work.
7. To reduce vibration, maintain the tool as
explained in this manual. If any abnormal
vibration occurs, stop use immediately.
SaVe tHeSe
inStructiOnS.
Page 6 For technical questions, please call 1-888-866-5797. Item 56932
SaFety OperatiOn MaintenanceSetup
GROUNDING
tO preVent eLectric SHOcK anD
DeatH FrOM incOrrect GrOunDinG
Wire cOnnectiOn: check with a
qualified electrician if you are in doubt
as to whether the outlet is properly grounded. Do
not modify the power cord plug provided with the
tool. never remove the grounding prong from the
plug. Do not use the tool if the power cord or plug
is damaged. if damaged, have it repaired by a
service facility before use. if the plug will not fit
the outlet, have a proper outlet installed by a
qualified electrician.
Grounded Tools: Tools
with Three Prong Plugs
3-prong plug and Outlet
1. Tools marked with “Grounding Required” have
a three wire cord and three prong grounding
plug. The plug must be connected to a properly
grounded outlet. If the tool should electrically
malfunction or break down, grounding provides
a low resistance path to carry electricity away
from the user, reducing the risk of electric
shock. (See 3-prong plug and Outlet.)
2. The grounding prong in the plug is connected
through the green wire inside the cord to the
grounding system in the tool. The green wire
in the cord must be the only wire connected
to the tool’s grounding system and must
never be attached to an electrically “live”
terminal. (See 3-prong plug and Outlet.)
3. The tool must be plugged into an appropriate outlet,
properly installed and grounded in accordance
with all codes and ordinances. The plug and outlet
should look like those in the preceding illustration.
(See 3-prong plug and Outlet.)
Double Insulated Tools: Tools
with Two Prong Plugs
Outlets for 2-prong plug
1. Tools marked “Double Insulated” do not
require grounding. They have a special
double insulation system which satisfies OSHA
requirements and complies with the applicable
standards of Underwriters Laboratories, Inc.,
the Canadian Standard Association,
and the National Electrical Code.
2. Double insulated tools may be used in either of the
120 volt outlets shown in the preceding illustration.
(See Outlets for 2-prong plug.)
Page 7For technical questions, please call 1-888-866-5797.Item 56932
SaFetyOperatiOnMaintenance Setup
Extension Cords
1. Grounded tools require a three
wire extension cord. Double Insulated tools can
use either a two or three wire extension cord.
2. As the distance from the supply outlet increases,
you must use a heavier gauge extension cord.
Using extension cords with inadequately sized wire
causes a serious drop in voltage, resulting in loss
of power and possible tool damage. (See table a.)
3. The smaller the gauge number of the wire, the
greater the capacity of the cord. For example,
a 14 gauge cord can carry a higher current
than a 16 gauge cord. (See table a.)
4. When using more than one extension cord
to make up the total length, make sure
each cord contains at least the minimum
wire size required. (See table a.)
5. If you are using one extension cord for more
than one tool, add the nameplate amperes
and use the sum to determine the required
minimum cord size. (See table a.)
6. If you are using an extension cord outdoors, make
sure it is marked with the suffix “W‑A” (“W” in
Canada) to indicate it is acceptable for outdoor use.
7. Make sure the extension cord is properly wired
and in good electrical condition. Always replace
a damaged extension cord or have it repaired
by a qualified electrician before using it.
8. Protect the extension cords from sharp objects,
excessive heat, and damp or wet areas.
taBLe a: recOMMenDeD MiniMuM Wire
GauGe FOr eXtenSiOn cOrDS* (120/240 VOLt)
naMepLate
aMpereS
(at full load)
eXtenSiOn cOrD
LenGtH
25´ 50´ 75´ 100´ 150´
0 – 2.0 18 18 18 18 16
2.1 – 3.4 18 18 18 16 14
3.5 – 5.0 18 18 16 14 12
5.1 – 7.0 18 16 14 12 12
7.1 – 12.0 18 14 12 10 ‑
12.1 – 16.0 14 12 10 ‑ ‑
16.1 – 20.0 12 10 ‑ ‑ ‑
* Based on limiting the line voltage drop to five volts at
150% of the rated amperes.
Symbology
Double Insulated
V
Volts
~
Alternating Current
A
Amperes
n
0
xxxx/min.
No Load Revolutions
per Minute (RPM)
WARNING marking
concerning Risk of Eye Injury.
Wear ANSI‑approved safety
goggles with side shields.
WARNING marking concerning
Risk of Respiratory Injury.
Wear NIOSH‑approved
breathing protection rated for
the hazards in your work area.
Read the manual before
set‑up and/or use.
WARNING marking
concerning Risk of Fire.
Do not cover ventilation ducts.
Keep flammable objects away.
WARNING marking concerning
Risk of Electric Shock.
Properly connect power cord
to appropriate outlet.
Page 8 For technical questions, please call 1-888-866-5797. Item 56932
SaFety OperatiOn MaintenanceSetup
Warning Symbols and Definitions
this is the safety alert symbol. it is used to
alert you to potential personal injury hazards.
Obey all safety messages that follow this symbol to
avoid possible injury or death.
indicates a hazardous
situation which, if not
avoided, will result in death or serious injury.
indicates a hazardous
situation which, if not
avoided, could result in death or serious injury.
indicates a hazardous
situation which, if not
avoided, could result in minor or moderate injury.
addresses practices not
related to personal injury.
Specifications
Electrical Rating 120 VAC / 60 Hz / 4 A
No Load Speed n
25,000/min
Max. Accessory Diameter 3″ (80 mm)
Collet Hole Diameter 1/4″
SET UP - BEFORE USE
read the entire iMpOrtant
SaFety inFOrMatiOn section at the
beginning of this manual including
all text under subheadings therein
before set up or use of this product.
Functional Description
2
1
3
1. Power Switch
2. Collet Nut
3. Spindle
OPERATING INSTRUCTIONS
read the entire iMpOrtant
SaFety inFOrMatiOn section at the
beginning of this manual including
all text under subheadings therein
before set up or use of this product.
Tool Set Up
tO preVent SeriOuS inJury FrOM
acciDentaL OperatiOn:
Make sure that the Switch is in the OFF position
and unplug the tool from its electrical outlet before
performing any procedure in this section.
tO preVent inJury: Wear heavy-duty work
gloves when handling wire wheels and brushes.
these accessories are sharp and can cause injury.
Installing Accessories
1. The accessory MUST be:
• Rated to at least 25,000 RPM.
• No larger than 3″ (80 mm) in diameter.
• Fitted with a 1/4″ mandrel.
• Undamaged.
• A sander, polisher, wire brush or grinding
wheel (accessories not included).
2. Hold Spindle with included Small
Wrench, while turning Collet Nut with
included Large Wrench to loosen.
3. Insert accessory’s mandrel into Collet at least 5/8″.
4. Using the Wrenches, securely tighten the Collet.
Workpiece and Work Area Set Up
1. Designate a work area that is clean and well‑lit.
The work area must not allow access by children
or pets to prevent distraction and injury.
2. Route the power cord along a safe route
to reach the work area without creating a
tripping hazard or exposing the power cord to
possible damage. The power cord must
reach the work area with enough extra length
to allow free movement while working.
3. Secure loose workpieces using a vise or clamps
(not included) to prevent movement while working.
4. There must not be hazardous objects, such
as utility lines or foreign objects, nearby
that will present a hazard while working.
5. You must use personal safety equipment including,
but not limited to, ANSI‑approved eye and hearing
protection, as well as heavy‑duty work gloves.
6. Before beginning work, provide for sparks
and debris that will fly off the work surface.
Page 9For technical questions, please call 1-888-866-5797.Item 56932
SaFetyOperatiOnMaintenance Setup
General Operation
tO preVent SeriOuS inJury: Grip
the tool firmly in both hands.
1. Make sure that Power Switch is in the
off‑position, then plug in the tool.
2. Slide Power Switch to ON “I” position.
3. Allow tool to come up to full speed
before touching the work surface.
4. Apply the accessory to the work surface,
allowing tool to operate at full speed. If
tool bogs down, use lighter pressure.
5. To create a smoother surface,
keep the accessory moving over the work surface.
6. Slide Power Switch to OFF “O” position to stop tool.
7. Allow tool to come to a complete
stop before setting it down.
8. To prevent accidents, turn off tool and disconnect
its power supply after use. Clean, then
store tool indoors out of children’s reach.
Grinding and Wire
Brushing Instructions
tO preVent SeriOuS inJury: Grip
the tool firmly in both hands.
1. Make sure that Power Switch is in the
off‑position, then plug in the tool.
2. Slide Power Switch to ON “I” position.
3. Allow tool to come up to full speed
before touching the work material.
4. Apply the wheel to the work material at a
10° – 15° angle, allowing tool to operate at full
speed. If tool bogs down, use lighter pressure.
5. To create a smoother surface,
keep the tool moving over the work surface.
6. Slide Power Switch to OFF “O” position to stop tool.
7. Allow tool to come to a complete
stop before setting it down.
8. To prevent accidents, turn off tool and disconnect
its power supply after use. Clean, then
store tool indoors out of children’s reach.
Sanding Instructions
tO preVent SeriOuS inJury: Grip
the tool firmly in both hands.
1. Wipe work surface clean of all dirt and debris.
2. Attach twist‑lock backing pad and sanding disc
(both sold separately).
3. Make sure that Power Switch is in the
off‑position, then plug in the tool.
4. Slide Power Switch to ON “I” position.
5. Allow tool to come up to full speed
before touching the work material.
6. Keep heavy pressure off of tool when operating.
Allow tool to do the work.
7. Move tool in a uniform pattern up and down or side
to side while sanding to ensure even sanding.
8. Periodically, stop tool and check for disc wear.
Replace worn sanding discs as needed.
9. Slide Power Switch to OFF “O” position to stop tool.
10. Allow tool to come to a complete
stop before setting it down.
11. To prevent accidents, turn off tool and disconnect
its power supply after use. Clean, then
store tool indoors out of children’s reach.
Page 10 For technical questions, please call 1-888-866-5797. Item 56932
SaFety OperatiOn MaintenanceSetup
MAINTENANCE AND SERVICING
procedures not specifically explained in
this manual must be performed only by a
qualified technician.
tO preVent SeriOuS inJury FrOM
acciDentaL OperatiOn:
Make sure that the Switch is in the off-position
and unplug the tool from its electrical outlet
before performing any procedure in this section.
tO preVent SeriOuS inJury
FrOM tOOL FaiLure:
Do not use damaged equipment.
if abnormal noise or vibration occurs, have
the problem corrected before further use.
Cleaning, Maintenance,
and Lubrication
1. BeFOre eacH uSe, inspect the general
condition of the tool. Check for:
• loose hardware,
• misalignment or binding of moving parts,
• damaged cord/electrical wiring,
• cracked or broken parts, and
• any other condition that may
affect its safe operation.
2. aFter uSe, wipe external surfaces
of the tool with clean cloth.
3. Periodically, wear ANSI‑approved safety goggles
and NIOSH‑approved breathing protection
and blow dust and grit out of the motor
vents using dry compressed air.
WarninG! tO preVent SeriOuS inJury: If
the supply cord of this power tool is damaged, it must
be replaced only by a qualified service technician.
Accessory Storage and Handling
1. Handle accessories carefully to prevent
dropping or bumping. Do not use wheels
that have been dropped or bumped.
2. Store accessories in shelves, racks, boxes,
or drawers. Keep storage area dry and
above freezing. Any grinding or cut‑off
wheels exposed to humidity or freezing
temperatures must not be used.
Page 11For technical questions, please call 1-888-866-5797.Item 56932
SaFetyOperatiOnMaintenance Setup
Troubleshooting
problem possible causes Likely Solutions
Tool will not start. 1. Cord not connected.
2. No power at outlet.
3. Internal damage or wear. (Power
Switch, for example.)
1. Check that cord is plugged in.
2. Check power at outlet.
If outlet is unpowered, turn off tool and
check circuit breaker. If breaker is tripped,
make sure circuit is right capacity for
tool and circuit has no other loads.
3. Have technician service tool.
Tool operates slowly. 1. Excess pressure applied to workpiece.
2. Power being reduced by long or small
diameter extension cord.
1. Decrease pressure, allow tool to do the work.
2. Eliminate use of extension cord.
If an extension cord is needed, use
one with the proper diameter for
its length and load. See Extension
Cords in GROUNDING section.
Performance
decreases over time.
Carbon brushes worn or damaged. Have qualified technician replace brushes.
Excessive noise
or rattling.
Internal damage or wear.
(Bearings, for example.)
Have technician service tool.
Overheating. 1. Forcing tool to work too fast.
2. Blocked motor housing vents.
3. Motor being strained by long or
small diameter extension cord.
1. Allow tool to work at its own rate.
2. Wear ANSI‑approved safety goggles
and NIOSH‑approved dust mask/
respirator while blowing dust out of
motor using compressed air.
3. Eliminate use of extension cord.
If an extension cord is needed,
use one with the proper diameter for
its length and load. See Extension
Cords in GROUNDING section.
Tool does not
operate effectively.
1. Accessory loose.
2. Accessory damaged, worn or
wrong type for the material.
1. Confirm accessory mandrel is
correct and Collet Nut is tight.
2. Check condition and type of accessory.
Use only proper type of accessory
in good condition.
Follow all safety precautions whenever diagnosing or servicing
the tool. Disconnect power supply before service.
record product’s Serial number Here:
note: If product has no serial number, record month and year of purchase instead.
note: Some parts are listed and shown for illustration purposes only, and are not available
individually as replacement parts. Specify UPC 193175545404 when ordering parts.
26677 agoura road • calabasas, ca 91302 • 1-888-866-5797
LIMITED 90 DAY WARRANTY
Harbor Freight Tools Co. makes every effort to assure that its products meet high quality and durability
standards, and warrants to the original purchaser that this product is free from defects in materials
and workmanship for the period of 90 days from the date of purchase. This warranty does not apply to
damage due directly or indirectly, to misuse, abuse, negligence or accidents, repairs or alterations outside
our facilities, criminal activity, improper installation, normal wear and tear, or to lack of maintenance.
We shall in no event be liable for death, injuries to persons or property, or for incidental, contingent,
special or consequential damages arising from the use of our product. Some states do not allow the
exclusion or limitation of incidental or consequential damages, so the above limitation of exclusion
may not apply to you. THIS WARRANTY IS EXPRESSLY IN LIEU OF ALL OTHER WARRANTIES,
EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS.
To take advantage of this warranty, the product or part must be returned to us with transportation charges
prepaid. Proof of purchase date and an explanation of the complaint must accompany the merchandise.
If our inspection verifies the defect, we will either repair or replace the product at our election or we may
elect to refund the purchase price if we cannot readily and quickly provide you with a replacement. We will
return repaired products at our expense, but if we determine there is no defect, or that the defect resulted
from causes not within the scope of our warranty, then you must bear the cost of returning the product.
This warranty gives you specific legal rights and you may also have other rights which vary from state to state.
