Harbor Freight 58089 4 1/2 Inch Angle Grinder Owner’s Manual

: October 30, 2023
: HARBOR FREIGHT

Harbor Freight 58089 4 1/2 Inch Angle Grinder

Harbor-Freight-58089-4-1-2-Inch-Angle-Grinder-fig-1

Product Information

The product is a power tool that requires assembly and comes with a user manual with safety instructions. The manual provides information on how to operate, inspect, maintain, and clean the product. The product has a serial number that needs to be written in the manual or the month and year of purchase if there is no serial number. The grinding wheel is not included and needs to be purchased separately. Technical support can be reached via email or by calling the customer service number provided.

Safety

The user manual includes several safety warnings and definitions. The safety alert symbol is used to indicate potential personal injury hazards. All safety messages that follow this symbol need to be obeyed to avoid possible injury or death. The manual also includes important safety information related to the use of power tools, work area safety, and electrical safety.

Specifications

No specifications are provided in the text extract.

Setup

When unpacking the product, make sure it is intact and undamaged. If any parts are missing or broken, contact customer service immediately. Tools required for assembly and service may not be included. Follow the instructions provided in the manual to assemble the product safely.

Operation

Read the manual before using the product as failure to do so can result in serious injury. Follow all safety warnings and instructions to avoid electric shock, fire, and/or serious injury. The work area needs to be clean and well- lit to avoid accidents. Do not operate power tools in explosive atmospheres or around children and bystanders.

Maintenance

The manual includes information on maintaining and cleaning the product. Follow the instructions provided to ensure safe and proper use of the product.

Warranty

The manual includes information on the product warranty.

Product Usage Instructions

Assemble the product safely by following the instructions provided in the manual.
Make sure the work area is clean and well-lit before using the product.
Do not operate the product in explosive atmospheres or around children and bystanders.
Read the manual before using the product and follow all safety warnings and instructions to avoid electric shock, fire, and/or serious injury.
Maintain and clean the product as per the instructions provided in the manual.

Save This Manual Keep this manual for the safety warnings and precautions, assembly, operating, inspection, maintenance and cleaning procedures. Write the product’s serial number in the back of the manual (or month and year of purchase if product has no number). Keep this manual and the receipt in a safe and dry place for future reference.

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.
Copyright© 2022 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.
WARNING
Read this material before using this product. Failure to do so can result in serious injury. SAVE THIS MANUAL.

WARNING SYMBOLS AND DEFINITIONS

Harbor-Freight-58089-4-1-2-Inch-Angle-Grinder-fig-2

SAFETY INFORMATION

General Power Tool Safety Warnings
WARNING

Read all safety warnings and instructions.
Failure to follow the warnings and instructions may result in electric shock, fire and/or serious injury. Save all warnings and instructions for future reference.
The term ″power tool″ in the warnings refers to your mains-operated (corded)
power tool or battery-operated (cordless) power tool.

Work area safety

Keep work area clean and well lit.
Cluttered or dark areas invite accidents.
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.
Keep children and bystanders away while operating a power tool. Distractions can cause you to lose control.

Electrical safety

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.
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.
Do not expose power tools to rain or wet conditions. Water entering a power tool will increase the risk of electric shock.
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.
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.
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

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.
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.
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.
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.
Do not overreach. Keep proper footing and balance at all times. This enables better control of the power tool in unexpected situations.
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.
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.
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.

Power tool use and care

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.
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.
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.
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.
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.
Keep cutting tools sharp and clean.
Properly maintained cutting tools with sharp cutting edges are less likely to bind and are easier to control.
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

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.

Safety Warnings Common for Grinding Sanding or Wire Brushing Operations

This power tool is intended to function as a grinder, sander or wire brush. 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.
Operations such as polishing 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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Do not operate the power tool near flammable materials. Sparks could ignite these materials.
Do not use accessories that require liquid coolants. Using water or other liquid coolants may result in electrocution or shock.
Maintain labels and nameplates on the tool. These carry important safety information.
If unreadable or missing, contact Harbor Freight Tools for a replacement.
Avoid unintentional starting.
Prepare to begin work before turning on the tool.
Do not depress the spindle lock when starting or during operation.
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.
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.
This product is not a toy. Keep it out of reach of children.
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.
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.
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 Operations

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.
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 and accidental contact with wheel.
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.
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.
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.

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

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.
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:

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.
Do not smoke during use. Nicotine reduces the blood supply to the hands and fingers, increasing the risk of vibration-related injury.
Wear suitable gloves to reduce the vibration effects on the user.
Use tools with the lowest vibration when there is a choice between different processes.
Include vibration-free periods each day of work.
Grip tool as lightly as possible (while still keeping safe control of it). Let the tool do the work.
To reduce vibration, maintain the tool as explained in this manual. If any abnormal vibration occurs, stop use immediately.

Grounding

WARNING
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

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.)
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.)
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

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.
Double insulated tools may be used in either of the 120 volt outlets shown in the preceding illustration.(See Outlets for 2-Prong Plug.)

Extension Cords

Grounded tools require a three wire extension cord. Double Insulated tools can use either a two or three wire extension cord.
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.)
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.)
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.)
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.)
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.
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.
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

Harbor-Freight-58089-4-1-2-Inch-Angle-Grinder-fig-5

Specifications

Electrical Rating	120 VAC / 60 Hz / 4.3 A
Motor No Load Speed	n0: 12,000/min
Max. Accessory Diameter (sold separately)	4-1/2″ (115 mm)
Max. Accessory Thickness	1/4″
Arbor Hole Diameter	7/8″
Spindle Thread	5/8″ x 11 TPI

Setup – 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.

WARNING

TO PREVENT SERIOUS INJURY FROM ACCIDENTAL OPERATION:
Turn the Power Switch of the tool off and unplug the tool from its electrical outlet before assembling or making any adjustments to the tool.

ASSEMBLY

Installing the Wheel Guard
WARNING
TO PREVENT SERIOUS INJURY: Do not operate this tool without the Wheel Guard properly installed.

Loosen the Wheel Guard Screw.
Slide the collar of the Wheel Guard over the rim of the Gear Housing.
Rotate the Wheel Guard as needed to shield you during the planned work.
Tighten the Wheel Guard Screw securely.
Check the Wheel Guard to ensure it is firmly in place. Adjust if necessary before proceeding.

Installing the Auxiliary Handle
WARNING
TO PREVENT SERIOUS INJURY:
Do not operate this tool with one hand only or without the Auxiliary Handle properly installed.

The Auxiliary Handle may be installed in one of two positions, on either side of the Gear Housing.
Screw the threaded end of the Auxiliary Handle into the selected position. Tighten securely before beginning work.

Functions

Harbor-Freight-58089-4-1-2-Inch-Angle-Grinder-fig-6

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
WARNING

TO PREVENT SERIOUS INJURY FROM ACCIDENTAL OPERATION:
Make sure that the Power Switch/Trigger is in the off-position and unplug the tool from its electrical outlet before performing any procedure in this section.
Installing a Non-threaded Grinding Wheel

The Grinding Wheel (sold separately) MUST be:
- rated to at least n0: 12,000/min.
- no larger than 4-1/2″ (115 mm) in diameter.
- fitted with a 7/8″ round arbor hole.
- 1/4″ thick or less.
- suitable for surface grinding, not edge grinding.
- dry and clean.
- proven undamaged by inspection.
Press in and hold the Spindle Lock Button to prevent the Spindle from turning.
Remove the Outer Flange. Keep the Inner Flange in position on the Spindle.
Closely inspect the Grinding Wheel before mounting.
For wheels with metal gaskets: Slip the grinding wheel onto the Spindle with the gasket first. The gasket should be centered on the grinding wheel and the wheel and gasket should rest flat against the Inner Flange.
- WARNING: To prevent serious injury, gaskets must be used for all grinding wheels they are provided with. Gaskets help prevent grinding wheel damage and wheel slippage, causes of wheel failure.
- 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.
Thread the Outer Flange onto the 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.

Installing a Threaded Accessory
CAUTION
TO PREVENT INJURY: Wear heavy-duty work gloves when handling wire wheels and brushes. These accessories are sharp and can cause injury.

The accessory MUST be:
- rated to at least n0: 12,000/min.
- no larger than 4-1/2″ (115 mm) in diameter.
- fitted with a threaded opening of 5/8″ x 11 TPI.
- undamaged.
- a sanding disc and backing pad,
- a sanding flap disc, a wire wheel or
- a wire cup brush (accessories not included).
Press in and hold the Spindle Lock Button to prevent the Spindle from turning.
Remove the Outer Flange and the
Inner Flange and keep in a safe place.
Thread disc accessory firmly onto the Spindle. Wrench tighten onto the spindle.

Workpiece and Work Area Set Up

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.
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.
Secure loose workpieces using a vise or clamps (not included) to prevent movement while working.
There must not be hazardous objects, such as utility lines or foreign objects, nearby that will present a hazard while working.
You must use personal safety equipment including, but not limited to, ANSI-approved eye and hearing protection, as well as heavy-duty work gloves.
Before beginning work, provide for sparks and debris that will fly off the work surface.

Grinding and Wire Brushing Instructions
WARNING
TO PREVENT SERIOUS INJURY: Grip the tool firmly in both hands.

Make sure that the Switch is in the OFF position, then plug in the tool.
Slide the Switch forward to start the tool. To turn off, release Switch. To lock Switch on for continuous operation, slide Switch forward and press down on the front of the Switch. To unlock and turn off tool, press on the rear of the Switch.
Allow the tool to come up to full speed before touching the work material.
Apply the wheel to the work material at a 10°–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.
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. Unplug the tool. Clean, then store the tool indoors out of children’s reach.

Sanding Instructions
WARNING
TO PREVENT SERIOUS INJURY: Grip the tool firmly in both hands.

Wipe the work surface clean of all dirt and debris, especially that of previous coarser sanding sessions, which will scratch the surface of a finer grit sanding session.
Attach the desired grit Sanding Disk (sold separately) onto the Backing Pad.
Make sure that the Switch is in the OFF position, then plug in the tool.
Slide the Switch forward to start the tool. To turn off, release Switch. To lock Switch on for continuous operation, slide Switch forward and press down on the front of the Switch. To unlock and turn off tool, press on the rear of the Switch.
Wait until the tool has reached full speed,
then gently contact the surface.
Keep heavy pressure off of the tool when operating. Allow the tool to do the work.
Move the tool in a uniform pattern up and down or side to side while sanding to ensure even sanding.
Periodically, stop the tool and check for disc wear. Replace worn sanding discs as needed.
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.Unplug the tool. Clean, then store the tool indoors out of children’s reach.

Maintenance and Servicing

Procedures not specifically explained in this manual must be performed only by a qualified technician.

WARNING

TO PREVENT SERIOUS INJURY FROM ACCIDENTAL OPERATION:
Turn the Power Switch of the tool off and unplug the tool from its electrical outlet before performing any inspection, maintenance, or cleaning procedures.
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

BEFORE EACH USE, inspect the general condition of the tool. Check for:
- loose hardware
- misalignment or binding of moving parts
- cracked or broken parts
- damaged electrical wiring
- any other condition that may affect its safe operation.
AFTER USE, wipe external surfaces of the tool with clean cloth.
Periodically blow dust and grit out of the motor vents using dry compressed air. Wear ANSI-approved safety goggles and NIOSH-approved breathing protection while doing this.
CARBON BRUSH MAINTENANCE.
The carbon brushes may require maintenance when the motor performance of the tool decreases or stops working completely. Carbon brushes are internal to the Motor Housing, and should only be checked by a qualified service technician.
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

Handle accessories carefully to preventdropping or bumping. Do not use wheelsthat have been dropped or bumped.
Store accessories in shelves, racks, boxes, ordrawers. Storage area must be kept dry, and abovefreezing. Any grinding or cut-off wheels exposed tohumidity or freezing temperatures must not be used.

Troubleshooting

problem	possible causes	Likely Solutions
Tool will not start.	1. Cord not connected.

2. No power at outlet.

3. Tool’s thermal reset

breaker tripped (if equipped).

4. Internal damage or wear. (Carbon brushes or 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. Turn off tool and allow to cool. Press reset button on tool.

4. 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.

(Carbon brushes or 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 grind, sand or brush effectively.| 1. Disc accessory may be loose on Spindle.

2. Disc accessory may be 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.

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.