HERCULES HE66 15A Large Angle Grinder Owner’s Manual

Work in progress

HE66 15A Large Angle Grinder

Model HE66

Owner’s Manual & Safety Instructions
21i

7″ ­ 9″ 15A Large Angle 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 57363 UPC 792363573634.

IMPORTANT SAFETY INFORMATION
GENERAL POWER TOOL SAFETY WARNINGS

Read all safety warnings and all 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. 7KHWHUPSRZHUWRROLQWKHZDUQLQJVUHIHUVWRRXU PDLQVRSHUDWHGFRUGHGSRZHUWRRO
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 FUHDWHVSDUNVZKLFKPDLJQLWHWKHGXVWRUIXPHV
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.8QPRGLILHGSOXJVDQGPDWFKLQJ 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.:DWHUHQWHULQJDSRZHUWRRO 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. $PRPHQWRILQDWWHQWLRQZKLOHRSHUDWLQJSRZHU WRROVPDUHVXOWLQVHULRXVSHUVRQDOLQMXU
2. Use safety equipment. Always wear eye protection. 6DIHWHTXLSPHQWVXFKDV dust mask, non-skid safety shoes, hard hat, RUKHDULQJSURWHFWLRQXVHGIRUDSSURSULDWH FRQGLWLRQVZLOOUHGXFHSHUVRQDOLQMXULHV
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.&DUULQJSRZHUWRROV ZLWKRXUILQJHURQWKHVZLWFKRUHQHUJL]LQJSRZHU tools that have the switch on invites accidents.
4. Remove any adjusting key or wrench before turning the power tool on. $ZUHQFKRUDNHOHIWDWWDFKHGWRDURWDWLQJSDUW RIWKHSRZHUWRROPDUHVXOWLQSHUVRQDOLQMXU
5. Do not overreach. Keep proper footing and balance at all times. This enables better control RIWKHSRZHUWRROLQXQH[SHFWHGVLWXDWLRQV
6. Dress properly. Do not wear loose clothing or jewelry. Keep your hair, clothing and gloves away from moving parts. Loose clothes, jewelry RUORQJKDLUFDQEHFDXJKWLQPRYLQJSDUWV
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. Only use safety equipment that has been approved by an appropriate standards agency. 8QDSSURYHGVDIHWHTXLSPHQWPDQRWSURYLGH DGHTXDWHSURWHFWLRQ(HSURWHFWLRQPXVWEH $16,DSSURYHGDQGEUHDWKLQJSURWHFWLRQ PXVWEH1,26+DSSURYHGIRUWKH VSHFLILFKD]DUGVLQWKHZRUNDUHD

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Power Tool Use and Care
1. Do not force the power tool. Use the correct power tool for your application. 7KHFRUUHFWSRZHUWRROZLOOGRWKHMREEHWWHUDQG safer at the rate for which it was designed.
2. Do not use the power tool if the Trigger does not turn it on and off. $QSRZHUWRRO that cannot be controlled with the Trigger LVGDQJHURXVDQGPXVWEHUHSDLUHG
3. Disconnect the plug from the power source before making any adjustments, changing accessories, or storing power tools. 6XFKSUHYHQWLYHVDIHWPHDVXUHVUHGXFHWKH ULVNRIVWDUWLQJWKHSRZHUWRRODFFLGHQWDOO
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 DUHFDXVHGESRRUOPDLQWDLQHGSRZHUWRROV
6. Keep cutting tools sharp and clean.3URSHUO PDLQWDLQHGFXWWLQJWRROVZLWKVKDUSFXWWLQJHGJHV 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 SRZHUWRROIRURSHUDWLRQVGLIIHUHQWIURPWKRVH 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 SRZHUWRROLVPDLQWDLQHG
Safety Warnings Common for Grinding, Sanding, Wire Brushing, or Abrasive 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 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 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.
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.
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.

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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. Never lay the power tool down until the accessory has come to a complete stop. 7KHVSLQQLQJDFFHVVRUPDJUDEWKHVXUIDFH DQGSXOOWKHSRZHUWRRORXWRIRXUFRQWURO
13. Do not run the power tool while carrying it at your side. Accidental contact with the VSLQQLQJDFFHVVRUFRXOGVQDJRXUFORWKLQJ SXOOLQJWKHDFFHVVRULQWRRXUERG
14. Regularly clean the power tool’s air vents. The motor’s fan will draw the dust inside WKHKRXVLQJDQGH[FHVVLYHDFFXPXODWLRQRI SRZGHUHGPHWDOPDFDXVHHOHFWULFDOKD]DUGV
15. Do not operate the power tool near flammable materials.6SDUNVFRXOGLJQLWHWKHVHPDWHULDOV
16. Do not use accessories that require liquid coolants. Using water or other liquid coolants may result in electrocution or shock.
17. Maintain labels and nameplates on the tool. These carry important safety information. If unreadable or missing, contact Harbor Freight Tools for a replacement.
18. Avoid unintentional starting. Prepare to begin work before turning on the tool.
19. Do not depress the spindle lock when starting or during operation.
20. 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.
21. 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.
22. This product is not a toy. Keep it out of reach of children.
23. 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 Trigger 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.

24. 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. 7KHRSHUDWRUFDQFRQWUROWRUTXHUHDFWLRQVRU NLFNEDFNIRUFHVLISURSHUSUHFDXWLRQVDUHWDNHQ
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. .LFNEDFNZLOOSURSHOWKHWRROLQGLUHFWLRQRSSRVLWHWR WKHZKHHO¶VPRYHPHQWDWWKHSRLQWRIVQDJJLQJ
4. Use special care when working corners, sharp edges etc. Avoid bouncing and snagging the accessory.&RUQHUVVKDUSHGJHVRUERXQFLQJ 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.

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Safety Warnings Specific for Grinding and Abrasive
Cutting-off Operations
1. Use only wheel types that are recommended for your power tool and the specific guard designed for the selected wheel. :KHHOVIRUZKLFKWKHSRZHUWRROZDVQRWGHVLJQHG cannot be adequately guarded and are unsafe.
2. 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. 7KHJXDUGKHOSVWRSURWHFWRSHUDWRUIURPEURNHQ wheel fragments and accidental contact with wheel.
3. Wheels must be used only for recommended applications. For example: do not grind with the side of cut-off wheel. Abrasive cut-off wheels DUHLQWHQGHGIRUSHULSKHUDOJULQGLQJVLGHIRUFHV DSSOLHGWRWKHVHZKHHOVPDFDXVHWKHPWRVKDWWHU
4. Always use undamaged wheel flanges that are of correct size and shape for your selected wheel. 3URSHUZKHHOIODQJHVVXSSRUW WKHZKHHOWKXVUHGXFLQJWKHSRVVLELOLWRIZKHHO breakage. Flanges for cut-off wheels may be different from grinding wheel flanges.
5. Do not use worn down wheels from larger power tools. Wheel intended for larger SRZHUWRROLVQRWVXLWDEOHIRUWKHKLJKHU VSHHGRIDVPDOOHUWRRODQGPDEXUVW
6. Dress appropriately. Wear leather leggings and ILUHUHVLVWDQWIRRWZHDUGXULQJXVH’RQRWZHDUSDQWV ZLWKFXIIVVKLUWVZLWKRSHQSRFNHWVRUDQFORWKLQJ WKDWFDQFDWFKDQGKROGPROWHQPHWDORUVSDUNV
Safety Warnings Specific for Abrasive 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 ZKHHOLQFUHDVHVWKHORDGLQJDQGVXVFHSWLELOLW to twisting or binding of the wheel in the cut and WKHSRVVLELOLWRINLFNEDFNRUZKHHOEUHDNDJH
2. Do not position your body in line with and behind the rotating wheel. When the wheel, DWWKHSRLQWRIRSHUDWLRQLVPRYLQJDZDIURP RXUERGWKHSRVVLEOHNLFNEDFNPDSURSHOWKH VSLQQLQJZKHHODQGWKHSRZHUWRROGLUHFWODWRX

3. When 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. 7KHZKHHOPDELQGZDONXSRUNLFNEDFNLIWKH SRZHUWRROLVUHVWDUWHGLQWKHZRUNSLHFH
5. Support panels or any oversized workpiece to minimize the risk of wheel pinching and kickback./DUJHZRUNSLHFHV WHQGWRVDJXQGHUWKHLURZQZHLJKW6XSSRUWV PXVWEHSODFHGXQGHUWKHZRUNSLHFHQHDU the line of cut and near the edge of the ZRUNSLHFHRQERWKVLGHVRIWKHZKHHO
6. Use extra caution when making a “pocket cut” into existing walls or other blind areas. 7KHSURWUXGLQJZKHHOPDFXWJDVRUZDWHUSLSHV electrical wiring or objects that can cause kickback.
Safety Warnings Specific for Sanding Operations
Do not use excessively oversized sanding disc paper. Follow manufacturer’s recommendations when selecting sanding paper. Larger sanding SDSHUH[WHQGLQJEHRQGWKHVDQGLQJSDG SUHVHQWVDODFHUDWLRQKD]DUGDQGPDFDXVH 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 FDQHDVLOSHQHWUDWHOLJKWFORWKLQJDQGRUVNLQ
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. :LUHZKHHORUEUXVKPDH[SDQGLQGLDPHWHU due to work load and centrifugal forces.

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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.

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

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 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.

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.)

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Extension Cords

Symbology

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.)

Double Insulated

V

Volts

~

Alternating Current

A

Amperes

WARNING marking concerning Risk of Eye Injury. Wear ANSI-approved safety goggles with side shields.

Read the manual before set-up and/or use.

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.

WARNING marking concerning Risk of Hearing Loss. Wear hearing protection. 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.
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.

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Specifications

Electrical Rating
Rated Speed
Spindle Thread Accessory (Wheel Guards) Diameters

120VAC / 60Hz / 15A 6500/min
5/8″-11 TPI 7″ (180mm) 9″ (230mm)

Functional Description

12

6

3

5
4
1. Auxiliary Handle 2. Spindle Lock 3. Trigger 4. Wheel Guard 5. Wheel Guard Lock Lever 6. Handle

OPERATION
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

Adjusting the Wheel Guard
TO PREVENT SERIOUS INJURY: Do not operate this tool without the Wheel Guard properly installed. 1. Pull out the Wheel Guard Lock Lever. 2. Rotate the Wheel Guard as needed to
shield you during the planned work. 3. Push the Wheel Guard Lock Lever back
into place to secure the Wheel Guard. 4. Check the Wheel Guard to ensure it is firmly in place.
Adjust if necessary before proceeding.
Wheel Guard Lock Lever
Installing Auxiliary Side 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 three
positions, on top or either side of the Gear Housing. 2. Screw the threaded end of the Auxiliary Handle
clockwise into the selected position. Tighten securely before beginning work.

TO PREVENT SERIOUS INJURY FROM ACCIDENTAL OPERATION: Make sure that the Trigger is in the OFF position and unplug the tool from its electrical outlet before performing any procedure in this section.

Auxiliary Handle

Handle Socket

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Item 57363

Installing a Non-threaded Grinding Wheel or Cut-Off Wheel (wheels sold separately)
1. For a Grinding Wheel, it MUST be: · rated to at least 6500/min · no larger than 9″ in diameter · fitted with a 5/8″ round arbor hole · from 0.035″ to 0.3″ thick · a type of grinding wheel suitable for surface grinding, not edge grinding · dry and clean · proven undamaged by inspection
For a Cut-Off Wheel, it MUST be: · rated to at least 6500/min · no larger than 9″ in diameter · fitted with a 5/8″ round arbor hole · from 0.035″ to 0.3″ thick · suitable for edge grinding, not surface grinding · dry and clean · proven undamaged by visual inspection
WARNING! TO PREVENT SERIOUS INJURY, When using a Cut-Off Wheel, a wheel guard designed specifically for Cut-Off Wheels (not included) must be installed for adequate protection if the wheel fails.
WARNING! TO PREVENT SERIOUS INJURY, Use only 7″ grinding wheels with 7″ guards. Use only 9″ grinding wheels with 9″ guards.
Wrench
Flange Nut
Grinding Wheel
Flange

2. Press in and hold the Spindle Lock to prevent the Spindle from turning.
3. Remove the Flange Nut. Keep the Flange in position on the Spindle.
4. Thread the Flange Nut 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 Nut. Overtightening can damage the wheel, causing wheel failure.
Installing a Threaded Accessory
TO PREVENT INJURY: Wear heavy-duty work gloves when handling wire wheels and brushes. These accessories are sharp and can cause injury. Do not exceed maximum rated speed of brush. Do not use a damaged brush. Replace damaged brushes immediately. Damaged or worn brushes will forcefully shoot wires into all objects not covered by the guard.
1. The accessory MUST be: · rated to at least 6500/min · no larger than 9″ 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).
2. Press in and hold the Spindle Lock Button to prevent the Spindle from turning.
3. Remove the Flange Nut and the Flange and keep in a safe place.
4. Thread disc accessory firmly onto the Spindle. Wrench tighten onto the Spindle.
WARNING! TO PREVENT SERIOUS INJURY, Use only 7″ grinding wheels with 7″ guards. Use only 9″ grinding wheels with 9″ guards.

Wheel Guard
Spindle Spindle Lock

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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.

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General Operation
TO PREVENT SERIOUS INJURY: Grip the tool firmly in both hands. 1. Make sure that the Trigger is not
locked on, then plug in the tool. 2. To start the tool, squeeze the Trigger. To
turn tool OFF, release the Trigger. a. For continuous operation, squeeze the
Trigger and then push the Trigger Lock. To turn tool OFF, squeeze the Trigger to release the Trigger Lock and then release the Trigger. b. If the Trigger is locked off, push the Trigger Lock and then squeeze the Trigger to start the tool. To turn the tool OFF, release the Trigger.

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.
WARNING! TO PREVENT SERIOUS INJURY: Do not grind with the side of the cutoff wheel. Abrasive cut-off wheels are intended for peripheral grinding; side forces applied to these wheels may cause them to shatter.
NOTICE: TO PREVENT TOOL DAMAGE: Only use the tool for 15-20 minutes at a time. Allow the tool to cool completely before next use.
4. 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.

Trigger Lock

Trigger

3. Allow the tool to come up to full speed before touching the work material.
For grinding or sanding operations, apply the wheel or disc 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.

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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 Trigger is locked and unplug the tool from its electrical outlet is removed 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
· any other condition that may affect its safe operation.
2. AFTER USE, wipe external surfaces of the tool with clean cloth.
3. Periodically blow dust and grit out of the motor vents using dry compressed air. Wear ANSIapproved safety goggles and NIOSH-approved breathing protection while doing this.
4. 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.

Page 12

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Item 57363

Troubleshooting

Problem
Tool will not start.
Tool operates slowly.
Performance decreases over time. Excessive noise or rattling. Overheating.
Tool does not grind, sand or brush effectively.

Possible Causes
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. Excess pressure applied to workpiece. 2. Power being reduced by long or
small diameter extension cord.
Carbon brushes worn or damaged.

Likely Solutions
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.
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 ([WHQVLRQ Cords in GROUNDING section. Have qualified technician replace brushes.

Internal damage or wear. (Carbon brushes or bearings, for example.) 1. Forcing tool to work too fast. 2. Blocked motor housing vents.
3. Motor being strained by long or small diameter extension cord.
1. Disc accessory may be loose on Spindle.
2. Disc accessory may be damaged, worn or wrong type for the material.

Have technician service tool.
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 ([WHQVLRQ Cords in GROUNDING section. 1. Be sure disc accessory is of correct dimension and 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.

PLEASE READ THE FOLLOWING CAREFULLY
THE MANUFACTURER AND/OR DISTRIBUTOR HAS PROVIDED THE PARTS LIST AND ASSEMBLY DIAGRAM IN THIS MANUAL AS A REFERENCE TOOL ONLY. NEITHER THE MANUFACTURER OR DISTRIBUTOR MAKES ANY REPRESENTATION OR WARRANTY OF ANY KIND TO THE BUYER THAT HE OR SHE IS QUALIFIED TO MAKE ANY REPAIRS TO THE PRODUCT, OR THAT HE OR SHE IS QUALIFIED TO REPLACE ANY PARTS OF THE PRODUCT. IN FACT, THE MANUFACTURER AND/OR DISTRIBUTOR EXPRESSLY STATES THAT ALL REPAIRS AND PARTS REPLACEMENTS SHOULD BE UNDERTAKEN BY CERTIFIED AND LICENSED TECHNICIANS, AND NOT BY THE BUYER. THE BUYER ASSUMES ALL RISK AND LIABILITY ARISING OUT OF HIS OR HER REPAIRS TO THE ORIGINAL PRODUCT OR REPLACEMENT PARTS THERETO, OR ARISING OUT OF HIS OR HER INSTALLATION OF REPLACEMENT PARTS THERETO.

Item 57363

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Page 13

PARTS LIST AND DIAGRAM

Parts List

Part

Description

1 Spindle Lock

2 Self-Locking Spring

3 Gear Box

4 O-Ring

5 Self-Locking Pin

6 Bearing, 6000-2RS

7 Rubber Pin

8 Retainer,14MM

9 Large Gear

10 Retainer, 40MM

11 Wave Washer

12 Bearing, 6203-LLU

13 O-Ring

14 Front Cover

15 Screw, M5 x 17

16 Dust-Proof Cover

17 Spindle

18 Key, 4 x 4 x 12

19 Wheel Guard, Ø180/black

20 Flange

21 Flange Nut

22 Screw, ST4.8 x 37

23 Auxiliary Handle

24 Nut, M8 x 1

25 Small Gear

26 Dust-Proof Washer

27 Rectangular Rubber Ring

28 Bearing, 6301-LLU

29 Dust-Proof Ring

Qty
1
1 1 1 1 1 1 1 1 1 1 1 1 1 4 1 1 1 1 1 1 4 1 1 1 1 1 1 1

Part

Description

30 Bearing Washer, Ø22

31 Retainer, 37mm

32 Rotor

33 Retainer

34 Bearing, 608-V1

35 Bearing Bushing

36 Air Deflector

37 Screw, ST5 x 65

38 Stator

39 Motor Housing

40 Label

41 Screw, ST4 x 14

42 Right Brush Cover

43 Brush Assembly

44 Brush Holder

45 Coil Spring

46 Right Handle

47 Screw, ST4.2 x 20

48 Trigger Assembly

49 Screw, ST4 x 16

50 Cord Sleeve

51 Power Cord

52 Left Handle

53 Screw, ST4 x 14

54 Brush Assembly

55 Left Brush Cover

56 Wheel Guard, Ø230/black

57 Lower Plate

58 Wrench

Qty
1 1 1 1 1 1 1 2 1 1 1 2 1 1 2 2 1 2 1 1 1 1 1 2 1 1 1 1 1

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 792363573634 when ordering parts.

Page 14

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Item 57363

Assembly Diagram

35
34 33

32

22

23

31 30

29

1

28

2

27

26

25

45

3

24

44 43

42

4

41 40

5

39 38

6

37

7

36

8

9

10

11

12

55 54

53

13

52 51

14

50

49

15

48

47 16

17

46

18

19

20 21

56

57

58

Item 57363

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Page 15

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.
Visit our website at: http://www.harborfreight.com Email our technical support at: productsupport@harborfreight.com
For technical questions, please call 1-888-866-5797 Copyright© 2020 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.
26677 Agoura Road · Calabasas, CA 91302 · 1-888-866-5797

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