20V Brushless 4-1/2″ - 5″ Paddle Switch Angle Grinder
Model
HCB619PB
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 1‑800‑444‑3353
as soon as possible. Reference 70964.
®
Owner’s Manual &
Safety Instructions
25k
Page 2 For technical questions, please call 1-800-444-3353. Item 70964
IMPORTANT SAFETY INFORMATION
General Power Tool Safety Warnings
Read all safety warnings, instructions, illustrations
and specifications provided with this power tool.
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 battery-operated (cordless) power tool.
Work area safety
1. Keep work area clean and well lit.
Cluttered or dark areas invite accidents.
2. Do not operate power tools in explosive
atmospheres, such as in the presence of
flammable liquids, gases or dust. Power tools
create sparks which may ignite the dust or fumes.
3. Keep children and bystanders away
while operating a power tool. Distractions
can cause you to lose control.
Electrical safety
1. Power tool plugs must match the outlet.
Never modify the plug in any way. Do not use
any adapter plugs with earthed (grounded)
power tools. 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
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 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 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
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.
9. 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.
10. Avoid unintentional starting.
Prepare to begin work before turning on the tool.
11. Do not lay the tool down until it has come to
a complete stop. Moving parts can grab the
surface and pull the tool out of your control.
12. When using a handheld power tool,
maintain a firm grip on the tool with both
hands to resist starting torque.
13. Do not depress the spindle lock when
starting or during operation.
Page 3For technical questions, please call 1-800-444-3353.Item 70964
14. Do not leave the tool unattended when the
Battery Pack is connected. Turn off the tool,
and remove the Battery Pack before leaving.
15. This product is not a toy.
Keep it out of reach of children.
16. 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.
17. 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.
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
qualified repair person using only identical
replacement parts. This will ensure that the
safety of the power tool is maintained.
2. Never service damaged BATTERY packs. Service
of BATTERY packs should only be performed by
the manufacturer or authorized service providers.
3. 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 cutting-off operations
1. This power tool is intended to function as a
grinder, sander, wire brush, or cut-off tool. 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 polishing or hole
cutting are not 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 convert this power tool to operate
in a way which is not specifically designed
and specified by the tool manufacturer.
Such a conversion may result in a loss of
control and cause serious personal injury.
4. Do not use accessories which are not specifically
designed and specified by the tool manufacturer.
Just because the accessory can be attached to
your power tool, it does not assure safe operation.
5. 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.
6. 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.
7. The dimensions of the accessory mounting
must fit the dimensions of the mounting
hardware of the power tool. Accessories
that do not match the mounting hardware of
the power tool will run out of balance, vibrate
excessively and may cause loss of control.
Page 4 For technical questions, please call 1-800-444-3353. Item 70964
8. 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.
9. 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 applications. The dust mask or respirator
must be capable of filtering out particles generated
by the particular application. Prolonged exposure
to high intensity noise may cause hearing loss.
10. 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.
11. Hold the power tool by insulated gripping
surfaces only, when performing an operation
where the 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 could
give the operator an electric shock.
12. 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.
13. 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.
14. 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.
15. Do not operate the power tool near flammable
materials. Sparks could ignite these materials.
16. Do not use accessories that require liquid
coolants. Using water or other liquid coolants
may result in electrocution or shock.
17. 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.
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.
5. Do not attach a saw chain woodcarving blade,
segmented diamond wheel with a peripheral gap
greater than 10 mm or toothed saw blade. Such
blades create frequent kickback and loss of control.
Page 5For technical questions, please call 1-800-444-3353.Item 70964
Safety warnings specific for
grinding and cutting-off operations
1. Use only wheel types that are recommended
for your power tool and the specific
guard designed for the selected wheel.
Wheels for which the power tool was not designed
cannot be adequately guarded and are unsafe.
2. The grinding surface of center depressed
wheels must be mounted below the plane
of the guard lip. An improperly mounted
wheel that projects through the plane of the
guard lip cannot be adequately protected.
3. The guard must be securely attached to the
power tool and positioned for maximum safety,
so the least amount of wheel is exposed towards
the operator. The guard helps to protect operator
from broken wheel fragments, accidental contact
with wheel and sparks that could ignite clothing.
4. Wheels must be used only for specified
applications. For example: do not grind with
the side of cut-off wheel. Abrasive cut-off wheels
are intended for peripheral grinding, side forces
applied to these wheels may cause them to shatter.
5. Always use undamaged wheel flanges
that are of correct size and shape for your
selected wheel. Proper wheel flanges support
the wheel thus reducing the possibility of wheel
breakage. Flanges for cut-off wheels may
be different from grinding wheel flanges.
6. Do not use worn down wheels from larger
power tools. Wheel intended for larger
power tool is not suitable for the higher
speed of a smaller tool and may burst.
7. When using dual purpose wheels always
use the correct guard for the application
being performed. Failure to use the correct
guard may not provide the desired level of
guarding, which could lead to serious injury.
8. Dress appropriately. Wear leather leggings and fire
resistant footwear during use. Do not wear pants
with cuffs, shirts with open pockets, or any clothing
that can catch and hold molten metal or sparks.
Additional safety warnings specific
for cutting-off operations
1. Do not “jam” the cut-off wheel or apply
excessive pressure. Do not attempt to make
an excessive depth of cut. Overstressing the
wheel increases the loading and susceptibility
to twisting or binding of the wheel in the cut and
the possibility of kickback or wheel breakage.
2. Do not position your body in line with and
behind the rotating wheel. When the wheel,
at the point of operation, is moving away from
your body, the possible kickback may propel the
spinning wheel and the power tool directly at you.
3. When the wheel is binding or when interrupting
a cut for any reason, switch off the power tool
and hold the power tool motionless until the
wheel comes to a complete stop. Never attempt
to remove the cut-off wheel from the cut while
the wheel is in motion otherwise kickback
may occur. Investigate and take corrective
action to eliminate the cause of wheel binding.
4. Do not restart the cutting operation in
the workpiece. Let the wheel reach full
speed and carefully re-enter the cut.
The wheel may bind, walk up or kickback if the
power tool is restarted in the workpiece.
5. Support panels or any oversized
workpiece to minimize the risk of wheel
pinching and kickback. Large workpieces tend to
sag under their own weight. Supports must be placed
under the workpiece near the line of cut and near the
edge of the workpiece on both sides of the wheel.
6. Use extra caution when making a “pocket cut”
into existing walls or other blind areas.
The protruding wheel may cut gas or water pipes,
electrical wiring or objects that can cause kickback.
7. Do not attempt to do curved cutting.
Overstressing the wheel increases the loading and
susceptibility to twisting or binding of the wheel
in the cut and the possibility of kickback or wheel
breakage, which can lead to serious injury.
Safety warnings specific
for sanding operations
1. Use proper sized sanding disc paper. Follow
manufacturers recommendations, when
selecting sanding paper. Larger sanding
paper extending too far 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.
Page 6 For technical questions, please call 1-800-444-3353. Item 70964
Battery tool use and care
1. Prevent unintentional starting. Ensure the
switch is in the off-position before connecting
to battery pack, picking up or carrying the
power tool. Carrying the power tool with your
finger on the switch or energizing power tool
that have the switch on invites accidents.
2. Disconnect the battery pack from the power
tool before making any adjustments, changing
accessories, or storing power tool. Such
preventive safety measures reduce the risk
of starting the power tool accidentally.
3. Recharge only with the charger specified by
the manufacturer. A charger that is suitable
for one type of battery pack may create a risk
of fire when used with another battery pack.
4. Use power tools only with specifically
designated battery packs. Use of any other
battery packs may create a risk of injury and fire.
5. When battery pack is not in use, keep it away
from other metal objects, like paper clips,
coins, keys, nails, screws or other small metal
objects, that can make a connection from
one terminal to another. Shorting the battery
terminals together may cause burns or a fire.
6. Under abusive conditions, liquid may be ejected
from the battery; avoid contact. If contact
accidentally occurs, flush with water. If liquid contacts
eyes, additionally seek medical help. Liquid ejected
from the battery may cause irritation or burns.
7. Do not use a battery pack or power tool that
is damaged or modified. Damaged or modified
batteries may exhibit unpredictable behavior
resulting in fire, explosion or risk of injury.
8. Do not expose a battery pack or power tool to
fire or excessive temperature. Exposure to fire
or temperature above 140°F may cause explosion.
9. Follow all charging instructions and do
not charge the battery pack or power tool
outside of the temperature range specified
in the instructions. Charging improperly or at
temperatures outside of the specified range may
damage the battery and increase the risk of fire.
10. Have servicing performed by a qualified
repair person using only identical
replacement parts. This will ensure that
the safety of the product is maintained.
11. Do not modify or attempt to repair the power
tool or the battery pack except as indicated
in the instructions for use and care.
12. The battery Charger gets hot during
use. The Charger’s heat can build up to
unsafe levels and create a fire hazard if it
does not receive adequate ventilation,
due to an electrical fault, or if it is used in a
hot environment. Do not place the Charger on a
flammable surface. Do not obstruct any vents on the
Charger. Especially avoid placing the Charger on
carpets and rugs; they are not only flammable, but
they also obstruct vents under the Charger. Place
the Charger on a stable, solid, nonflammable surface
(such as a stable metal workbench or concrete floor)
at least 1 foot away from all flammable objects, such
as drapes or walls. Keep a fire extinguisher and a
smoke detector in the area. Frequently monitor the
Charger and Battery Pack while charging.
Lithium Battery Safety Warnings
LITHIUM BATTERIES STORE
A LARGE AMOUNT OF ENERGY AND
WILL VENT FIRE OR EXPLODE
IF MISTREATED:
1. Keep Battery Pack dry.
2. DO NOT DO ANY OF THE FOLLOWING
TO THE BATTERY PACK:
• Open,
• Drop,
• Short-circuit,
• Puncture,
• Incinerate, or
• Expose to temperatures greater than 140°F.
3. Charge Battery Pack only according
to its Charger’s instructions.
4. Inspect Battery Pack before every use;
do not use or charge if damaged
Page 7For technical questions, please call 1-800-444-3353.Item 70964
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
GROUNDING
TO PREVENT ELECTRIC SHOCK AND
DEATH FROM INCORRECT GROUNDING:
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 charger. Never remove the
grounding prong from the plug. Do not use the
charger 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.
Extension Cords
Note: Extension cords must not be
used with this item’s Charger.
Page 8 For technical questions, please call 1-800-444-3353. Item 70964
Symbology
V
Volts
Direct 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 Hearing Loss.
Wear hearing protection.
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 Do not use the
guard for cut‑off operations.
WARNING Always operate
with two hands.
WARNING marking
concerning Risk of Fire.
Do not cover Charger ventilation ducts.
Charge on fireproof surface only.
WARNING marking concerning
Risk of Electric Shock.
Properly connect Charger’s power
cord to appropriate outlet.
WARNING marking concerning
Risk of Explosion.
Do not puncture, short, or open
battery packs and do not charge
damaged battery packs.
Specifications
Battery Type Hercules20 VLi-Ion
Charger Type Hercules 20V Li‑Ion
No Load Speed n
0
: 3000‑11000/min
Arbor Hole Diameter 7/8″
Spindle Thread 5/8″-11UNC
Max. Accessory Diameter 5" (Ø125mm)
Max. Wheel Thickness 1/4"
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.
Functional Description
1. Auxiliary Handle
2. Spindle Lock Button
3. Paddle Switch
4. Wheel Guard
5. Wheel Guard Lock
6. Paddle Lock
7. Handle
8. Speed Selector
2
5
4
3
1
6
7
8
Page 9For technical questions, please call 1-800-444-3353.Item 70964
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.
TO PREVENT SERIOUS INJURY FROM
ACCIDENTAL OPERATION:
Make sure that the Paddle Switch is in the
off-position and remove its Battery Pack before
performing any procedure in this section.
Tool Changing
Battery Charging
Charge battery before using this tool. Follow
instructions included with battery charger.
Installing the Wheel Guard
TO PREVENT SERIOUS INJURY: Do not operate this
tool without the Wheel Guard properly installed.
1. Select Wheel Guard for Wheel type being used.
Wheel Guard Wheel Type
Type 27
Type27grinding / combowheel
Type27 / 42cut-offwheel
Type 01
Type01 / 41cut-offwheel
2. Pull back Wheel Guard Lock.
3. Slide Wheel Guard into Groove under Lip.
4. Rotate Wheel Guard as needed to shield
you during the planned work.
5. Release Wheel Guard Lock.
6. Check Wheel Guard is locked firmly in place.
Adjust if necessary before proceeding.
Groove
Wheel
Guard Lock
Wheel Guard
Lip
Installing the Auxiliary Handle
TO PREVENT SERIOUS INJURY:
Do not operate this tool with one hand only or
without the Auxiliary Handle properly installed.
1. The Auxiliary Handle may be installed in one
of two positions on either side of the tool.
2. Screw threaded end of Auxiliary Handle
clockwise into selected position.
Tighten securely before beginning work.
Auxiliary
Handle
Auxiliary
Handle Socket
Page 10 For technical questions, please call 1-800-444-3353. Item 70964
Installing a Non-threaded Wheel
1. The Grinding, Cut‑off, or Combo Wheel , MUST be:
• rated to at least 11,000 RPM.
• no larger than 5" (125mm) diameter.
• fittedwitha7/8″roundarborhole.
• 1/4″ (6mm) thick or less.
• suitable for surface grinding,
edge grinding, or both.
• dry and clean.
• proven undamaged by inspection.
2. Press in and hold Spindle Lock Button
to prevent Spindle from turning.
3. Remove Outer Flange and keep in a safe place.
Keep Inner Flange in position on the Spindle.
4. Place Wheel over Spindle.
Note: The Outer Flange has a step for improved
stability with thick accessories. Keep this
step on the inside for thick accessories. To
allow proper clamping for thin accessories, flip
Outer Flange so this step is on the outside.
5. Thread Outer Flange onto Spindle. Wrench tighten
only enough so that the wheel is securely held on
the spindle.
WARNING: To prevent serious injury,
do not overtighten flange. Overtightening can
damage the wheel, causing wheel failure.
Wrench
Outer Flange
Wheel
Spindle
Installing a Threaded Wheel
1. The Grinding, Cut‑off, or Combo Wheel , MUST be:
• rated to at least 11,000 RPM.
• no larger than 5″ (125mm) diameter.
• fittedwithathreadedopeningof5/8″ - 11UNC
• 1/4″ (6mm) thick or less.
• suitable for surface grinding,
edge grinding, or both.
• dry and clean.
• proven undamaged by inspection.
2. Press in and hold Spindle Lock Button
to prevent the Spindle from turning.
3. Remove Outer Flange and Inner Flange
and keep in a safe place.
4. Thread wheel firmly onto the Spindle.
Wrench tighten onto the Spindle.
Wheel
Spindle
Page 11For technical questions, please call 1-800-444-3353.Item 70964
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. Secure loose workpieces using a vise or clamps
(not included) to prevent movement while working.
3. There must not be hazardous objects, such
as utility lines or foreign objects, nearby that
will present a hazard while working.
4. You must use personal safety equipment including,
but not limited to, ANSI‑approved eye and hearing
protection, as well as heavy‑duty work gloves.
5. Before beginning work, provide for sparks
and debris that will fly off the work surface.
General Instructions for Use
TO PREVENT SERIOUS INJURY: Grip
the tool firmly in both hands.
1. Make sure that the Paddle Switch is in the
off‑position, then attach the Battery Pack.
2. Push Speed Selector button to desired speed.
3. Pull Paddle Lock back then squeeze the
Paddle Switch to start the tool. Release
the Paddle Switch to stop the tool.
Paddle LockPaddle Switch
4. Allow the tool to come up to full speed
before touching the work material.
WARNING: TO PREVENT SERIOUS INJURY:
Do not grind with the side of the cut-off
wheel. Abrasive cut‑off wheels are intended
for peripheral grinding; side forces applied to
these wheels may cause them to shatter.
For grinding operations, apply the wheel or
disctotheworkmaterialata10°– 15°angle,
allowing the tool to operate at full speed. If
the tool bogs down, use lighter pressure.
To create a smoother surface, keep the
tool moving over the work surface.
For abrasive cutting-off operations,
apply the cut‑off wheel straight into the work
material using only the edge of the wheel,
allowing the tool to operate at full speed. If
the tool bogs down, use lighter pressure.
5. TO PREVENT ACCIDENTS, AFTER USE:
Turn off the tool.
WARNING: TO PREVENT SERIOUS INJURY:
Allow the tool to come to a complete stop before
setting it down.
Remove the tool’s Battery Pack. Clean, then
store the tool indoors out of children’s reach.
®
Page 12 For technical questions, please call 1-800-444-3353. Item 70964
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 Paddle Switch is in the
off-position and remove its Battery Pack 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:
• leaking, swollen, or cracked battery pack,
• loose hardware,
• misalignment or binding of moving parts,
• 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.
4. Li‑Ion BATTERY MUST BE RECYCLED OR
DISPOSED OF PROPERLY.
Do not short, incinerate or open battery.
5. Disconnect battery pack and store battery pack,
charger, and tool in dry, indoor area out of
reach of children and away from metal objects
(i.e., paperclips, coins) to prevent shorting.
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 13For technical questions, please call 1-800-444-3353.Item 70964
Troubleshooting
Problem Possible Causes Likely Solutions
Tool will not start. 1. Battery Pack not properly connected.
2. Battery Pack not properly charged.
3. Battery Pack worn out.
4. Tool’s thermal reset
breaker tripped (if equipped).
5. Internal damage or wear.
(Switch, for example.)
1. Remove Battery Pack, make sure there
are no obstructions, reinsert the Battery
Pack according to its shape (it should
only fit one way), and press firmly until
the Battery Pack locks in place.
2. Make sure Charger is connected and
operating properly. Give enough time
for Battery Pack to recharge properly.
3. Dispose of old Battery Pack
properly or recycle. Replace Battery Pack.
4. Turn off tool and allow to cool.
Press reset button on tool.
5. Have technician service tool.
Tool operates slowly. 1. Excess pressure applied to workpiece.
2. Battery Pack power low.
3. Battery Pack worn out.
1. Decrease pressure, allow tool to do the work.
2. Recharge Battery Pack.
3. Dispose of old Battery Pack
properly or recycle. Replace Battery Pack.
Performance
decreases over time.
Battery Pack wearing out. Battery Pack capacity will gradually
decrease through use. If symptoms
are severe, recycle old Battery Pack
(or dispose of properly) and replace it.
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.
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.
Tool does not
operate effectively.
1. Accessory loose.
2. Accessory damaged, worn or
wrong type for the material.
1. Confirm accessory arbor is correct and
Outer Flange/Arbor Nut is tight.
2. Check condition and type of disc accessory.
Use only proper type of disc
accessory in good condition.
Follow all safety precautions whenever diagnosing or servicing
the tool. Disconnect power supply before service.
Page 14 For technical questions, please call 1-800-444-3353. Item 70964
Record Product’s Date Code Here:
Note: If product has no date code, 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 193175522740 when ordering parts.
Page 15For technical questions, please call 1-800-444-3353.Item 70964
®
®
26677 Agoura Road • Calabasas, CA 91302 • 1-800-444-3353
5-YEAR LIMITED WARRANTY
This Hercules tool is warranted to the original purchaser to be free from defects in materials and
workmanship for a period of five (5) years beginning on the date of purchase. This warranty does not
cover battery packs and battery chargers, which are covered under separate warranties. To obtain
warranty service, visit your local Harbor Freight retail store. Warranty registration is not required. The
product or part must be returned to us with proof of purchase (e.g. in‑store receipt or packing slip/invoice)
and may require shipment by purchaser to a service center at purchaser’s expense. If our inspection
verifies a covered defect in materials or workmanship during the warranty period, we will, at our option,
repair or replace the defective product. We will return repaired products within a reasonable time at our
expense, but if we determine that there is no defect, or that the defect resulted from causes not within
the scope of our warranty, then we will return the product to you if you pay return shipping costs.
This warranty does not cover any failure or damage that we determine is due directly or indirectly
to normal wear and tear, misuse, use not for the intended purpose or not in accordance with the
product manual, abuse, accident, rental, modification or alteration, unauthorized repair, improper
installation, neglect, lack of maintenance, or any other failure not arising from defective materials or
workmanship. Fraudulent returns or claims will be denied. The repair or replacement described in this
warranty shall be your sole and exclusive remedy. THIS WARRANTY IS EXCLUSIVE AND IN LIEU
OF ALL OTHER EXPRESS WARRANTIES, WRITTEN OR ORAL, AND ANY IMPLIED WARRANTIES
ARE DISCLAIMED TO THE EXTENT PERMITTED BY LAW AND OTHERWISE LIMITED TO THE
DURATION OF THE EXPRESS WARRANTY HEREIN. HARBOR FREIGHT SHALL NOT BE LIABLE
UNDER ANY CIRCUMSTANCES FOR ANY INCIDENTAL, INDIRECT, SPECIAL, CONSEQUENTIAL,
OR PUNITIVE DAMAGES OR COSTS ARISING FROM THIS WARRANTY OR THE USE OF THIS
PRODUCT. SOME STATES DO NOT ALLOW LIMITATIONS ON HOW LONG AN IMPLIED WARRANTY
LASTS OR THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES, SO
THESE LIMITATIONS MAY NOT APPLY TO YOU. THIS WARRANTY GIVES YOU SPECIFIC LEGAL
RIGHTS, AND YOU MAY ALSO HAVE OTHER RIGHTS WHICH VARY FROM STATE TO STATE.
Visit our website at: https://www.harborfreight.com
Email our technical support at: [email protected]
For technical questions, please call 1-800-444-3353
Copyright
©
2025 by Harbor Freight Tools
®
. All rights reserved. No portion of this manual or
any artwork contained herein may be reproduced in any shape or form without the express
written consent of Harbor Freight Tools. Diagrams within this manual may not be drawn
proportionally. Due to continuing improvements, actual product may differ slightly from the
product described herein. Tools required for assembly and service may not be included.
