DeWalt DWE4559CNG, DWE4559N, DWE4557, DWE4557G, DWE4559CN User Manual

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INSTRUCTION MANUAL

GUIDE D’UTILISATION MANUAL DE INSTRUCCIONES

INSTRUCTIVO DE OPERACIÓN, CENTROS DE SERVICIO Y PÓLIZA DE GARANTÍA. ADVERTENCIA: LÉASE ESTE INSTRUCTIVO ANTES DE USAR EL PRODUCTO.

D28499, DWE4557, DWE4557G, DWE4559CN, DWE4559NG, DWE4559CNG, DWE4559N, DWE4597, DWE4597N, DWE4599N

Heavy Duty Large Angle Grinders

Grandes rectifieuses coudées de service intensif Esmeriladoras de ángulo grande para trabajo pesado

Definitions: Safety Guidelines

The definitions below describe the level of severity for each signal word. Please read the manual and pay attention to these symbols.

DANGER: Indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury. WARNING: Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.

CAUTION: Indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury. NOTICE: Indicates a practice not related to personal injury which, if not avoided, may result in property damage.

IF YOU HAVE ANY QUESTIONS OR COMMENTS ABOUT THIS OR ANY DEWALT TOOL, CALL US TOLL FREE AT: 1-800-4-DEWALT (1-800-433-9258).

WARNING: To reduce the risk of injury, read the instruction manual.

General Power Tool Safety Warnings

WARNING! 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

The term “power tool” in the warnings refers to your mains-operated (corded) power tool or battery-operated (cordless) power tool.

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1)WORK AREA SAFETY

a)Keep work area clean and well lit. Cluttered or dark areas invite accidents.

b)Do not operate power tools in explosive atmospheres, such as in the presence of flammable liquids, gases or dust. Power tools create sparks which may ignite the dust or fumes.

c)Keep children and bystanders away while operating a power tool. Distractions can cause you to lose control.

2)ELECTRICAL SAFETY

a)Power tool plugs must match the outlet. Never modify the plug in any way. Do not use any adapter plugs with earthed (grounded) power tools. Unmodified plugs and matching outlets will reduce risk of electric shock.

b)Avoid body contact with earthed or grounded surfaces such as pipes, radiators, ranges and refrigerators. There is an increased risk of electric shock if your body is earthed or grounded.

c)Do not expose power tools to rain or wet conditions.

Water entering a power tool will increase the risk of electric shock.

d)Do not abuse the cord. Never use the cord for carrying, pulling or unplugging the power tool. Keep cord away from heat, oil, sharp edges or moving parts. Damaged or entangled cords increase the risk of electric shock.

e)When operating a power tool outdoors, use an extension cord suitable for outdoor use. Use of a cord suitable for outdoor use reduces the risk of electric shock.

f) If operating a power tool in a damp location is unavoidable, use a ground fault circuit interrupter (GFCI) protected supply. Use of a GFCI reduces the risk of electric shock.

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3)PERSONAL SAFETY

a)Stay alert, watch what you are doing and use common sense when operating a power tool. Do not use a power tool while you are tired or under the influence of drugs, alcohol or medication. A moment of inattention while operating power tools may result in serious personal injury.

b)Use personal protective equipment. Always wear eye protection. Protective equipment such as dust mask, nonskid safety shoes, hard hat, or hearing protection used for appropriate conditions will reduce personal injuries.

c)Prevent unintentional starting. Ensure the switch is in the off position before connecting to power source and/ or battery pack, picking up or carrying the tool. Carrying power tools with your finger on the switch or energizing power tools that have the switch on invites accidents.

d)Remove any adjusting key or wrench before turning the power tool on. A wrench or a key left attached to a rotating part of the power tool may result in personal injury.

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

f) Dress properly. Do not wear loose clothing or jewelry. Keep your hair, clothing and gloves away from moving parts. Loose clothes, jewelry or long hair can be caught in moving parts.

g)If devices are provided for the connection of dust extraction and collection facilities, ensure these are connected and properly used. Use of dust collection can reduce dust-related hazards.

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4)POWER TOOL USE AND CARE

a)Do not force the power tool. Use the correct power tool for your application. The correct power tool will do the job better and safer at the rate for which it was designed.

b)Do not use the power tool if the switch does not turn it on and off. Any power tool that cannot be controlled with the switch is dangerous and must be repaired.

c)Disconnect the plug from the power source and/or the battery pack from the power tool before making any adjustments, changing accessories, or storing power tools. Such preventive safety measures reduce the risk of starting the power tool accidentally.

d)Store idle power tools out of the reach of children and do not allow persons unfamiliar with the power tool or these instructions to operate the power tool. Power tools are dangerous in the hands of untrained users.

e)Maintain power tools. Check for misalignment or binding of moving parts, breakage of parts and any other condition that may affect the power tool’s operation. If damaged, have the power tool repaired before use. Many accidents are caused by poorly maintained power tools.

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

g)Use the power tool, accessories and tool bits, etc. in accordance with these instructions, taking into account the working conditions and the work to be performed.

Use of the power tool for operations different from those intended could result in a hazardous situation.

5)SERVICE

a)Have your power tool serviced by a qualified repair person using only identical replacement parts. This will ensure that the safety of the power tool is maintained.

SAFETY INSTRUCTIONS FOR ALL OPERATIONS

Safety Warnings Common for Grinding, Sanding, Wire Brushing, Polishing or Abrasive, Cutting-Off Operations

a)This power tool is intended to function as a grinder, sander, wire brush, polisher 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.

b)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.

c)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.

d)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.

e)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

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match the mounting hardware of the power tool will run out of balance, vibrate excessively and may cause loss of control.

f) 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.

g)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 dust mask or respirator must be capable of filtrating particles generated by your operation. Prolonged exposure to high intensity noise may cause hearing loss.

h)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.

i)Hold power tool by insulated gripping surfaces only, when performing an operation where the cutting accessory may contact hidden wiring or its own cord.

Cutting accessory contacting a “live” wire may make exposed metal parts of the power tool “live” and could give the operator an electric shock.

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j)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.

k)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.

l)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.

m)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.

n)Do not operate the power tool near flammable materials.

Sparks could ignite these materials.

o)Do not use accessories that require liquid coolants.

Using water or other liquid coolants may result in electrocution or shock.

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:

a)Maintain a firm grip on the power tool and position your body and arm to allow you to resist kickback forces. Always use auxiliary handle, if provided, for maximum control over kickback or torque reaction during start up.

The operator can control torque reaction or kickback forces, if proper precautions are taken.

b)Never place your hand near the rotating accessory.

Accessory may kickback over your hand.

c)Do not position your body in the area where power tool will move if kickback occurs. Kickback will propel the tool in direction opposite to the wheel’s movement at the point of snagging.

d)Use special care when working corners, sharp edges etc. Avoid bouncing and snagging the accessory. Corners, sharp edges or bouncing have a tendency to snag the rotating accessory and cause loss of control or kickback.

e)Do not attach a saw chain woodcarving blade or toothed saw blade. Such blades create frequent kickback and loss of control.

Safety Warnings Specific for Grinding and Abrasive Cutting-Off Operations

a)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.

b)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

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to protect operator from broken wheel fragments, accidental contact with wheel , and sparks that could ignite clothing.

c)Wheels must be used only for recommended 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.

d)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.

e)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.

Additional Safety Warnings Specific for Abrasive Cutting-Off Operations

a)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.

b)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.

c)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.

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d)Do not restart the cutting operation in the workpiece. Let the wheel reach full speed and carefully reenter the cut. The wheel may bind, walk up or kickback if the power tool is restarted in the workpiece.

e)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.

f) 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.

Safety Warnings Specific for Sanding Operations

a)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 Polishing Operations

a)Do not allow any loose portion of the polishing bonnet or its attachment strings to spin freely. Tuck away or trim any loose attachment strings. Loose and spinning attachment strings can entangle your fingers or snag on the workpiece.

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Safety Warnings Specific for Wire Brushing Operations

a)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.

b)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.

Additional Safety Rules for Grinders

WARNING: The grinding wheel or accessory may loosen during coast-down of the tool when shut off. If grinding wheel or accessory loosens, it may dismount from the machine and may cause serious personal injury.

•Use of accessories not specified in this manual is not recommended and may be hazardous. Use of power boosters that would cause the tool to be driven at speeds greater than its rated speed constitutes misuse.

•Use clamps or another practical way to secure and support the workpiece to a stable platform. Holding the work by hand or against your body leaves it unstable and may lead to loss of control.

•Avoid bouncing the wheel or giving it rough treatment. If this occurs, stop the tool and inspect the wheel for cracks or flaws.

•Always handle and store wheels in a careful manner.

•Never cut into area that may contain electrical wiring or piping. Serious injury may result.

•Do not operate this tool for long periods of time. Vibration caused by the operating action of this tool may cause permanent injury to fingers, hands, and arms. Use gloves to provide extra cushion, take frequent rest periods, and limit daily time of use.

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•Direct the Dust Ejection System (DES) away from operator and coworkers. Serious injury may result.

•When the gear case grip is properly installed, the use of the side handle is not required.

•When not in use, place grinder on a stable surface where it will not move inadvertantly, roll or cause a tripping or falling hazard. Serious personal injury may result.

•Air vents often cover moving parts and should be avoided.

Loose clothes, jewelry or long hair can be caught in moving parts.

•An extension cord must have adequate wire size (AWG or American Wire Gauge) for safety. The smaller the gauge number of the wire, the greater the capacity of the cable, that is 16 gauge has more capacity than 18 gauge. An undersized cord will cause a drop in line voltage resulting in loss of power and overheating. When using more than one extension to make up the total length, be sure each individual extension contains at least the minimum wire size. The following table shows the correct size to use depending on cord length and nameplate ampere rating. If in doubt, use the next heavier gauge. The smaller the gauge number, the heavier the cord.

Minimum Gauge for Cord Sets

			Volts		Total Length of Cord
					in Feet (meters)
	Ampere Rating
			120V	25 (7.6)	50 (15.2)	100 (30.5)	150 (45.7)
			240V	50 (15.2)	100 (30.5)	200 (61.0)	300 (91.4)
	More	Not More			AWG
	Than	Than
	0	6		18	16	16	14
	6	10		18	16	14	12
	10	12		16	16	14	12
	12	16		14	12	Not Recommended

WARNING: ALWAYS use safety glasses. Everyday eyeglasses are NOT safety glasses. Also use face or dust mask if cutting operation is dusty. ALWAYS WEAR CERTIFIED SAFETY EQUIPMENT:

•ANSI Z87.1 eye protection (CAN/CSA Z94.3),

•ANSI S12.6 (S3.19) hearing protection,

•NIOSH/OSHA/MSHA respiratory protection.

WARNING: Some dust created by power sanding, sawing, grinding, drilling, and other construction activities contains chemicals known to the State of California to cause cancer, birth defects or other reproductive harm. Some examples of these chemicals are:

•lead from lead-based paints,

•crystalline silica from bricks and cement and other masonry products, and

•arsenic and chromium from chemically-treated lumber.

Your risk from these exposures varies, depending on how often you do this type of work. To reduce your exposure to these chemicals: work in a well ventilated area, and work with approved safety equipment, such as those dust masks that are specially designed to filter out microscopic particles.

•Avoid prolonged contact with dust from power sanding, sawing, grinding, drilling, and other construction activities. Wear protective clothing and wash exposed areas with soap and water. Allowing dust to get into your mouth, eyes, or lay on the skin may promote absorption of harmful chemicals.

WARNING: Use of this tool can generate and/or disperse dust, which may cause serious and permanent respiratory or other injury. Always use NIOSH/OSHA approved respiratory protection appropriate for the dust exposure. Direct particles away from face and body.

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WARNING: Always wear proper personal hearing protection that conforms to ANSI S12.6 (S3.19) during use. Under some conditions and duration of use, noise from this product may contribute to hearing loss.

• The label on your tool may include the following symbols. The

symbols and their definitions are as follows:
V............				volts	A............				amperes
Hz..........				hertz	W..............				watts
min ........				minutes				............	alternating current
			.....direct current						alternating or direct
								............
				Class I Construction	no				current
		..........
				(grounded)					no load speed
		..........		Class II Construction	n ...............				rated speed
				(double insulated)					earthing terminal
								.............
…/min ...				per minute			..............		safety alert symbol
IPM...........				impacts per minute	BPM .........				beats per minute
SPM .........				strokes per minute	RPM .........				revolutions per
sfpm .........				surface feet per					minute
				minute

SAVE THESE INSTRUCTIONS FOR

FUTURE USE

Motor

Be sure your power supply agrees with the nameplate marking. Voltage decrease of more than 10% will cause loss of power and overheating. DEWALT tools are factory tested; if this tool does not operate, check power supply.

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FAMILIARIZATION

Large angle grinders are designed for heavy material removal in extended use applications. The following grinders are described in this manual:

D28499	9" Angle Grinder	6,000 rpm
DWE4557G	7" Angle Grinder	8,500 rpm
DWE4559NG	9" Angle Grinder	6,500 rpm
DWE4559CNG	9" Angle Grinder	6,500 rpm
DWE4597	7" Angle Grinder	8,500 rpm
DWE4597N	7" Angle Grinder	8,500 rpm
DWE4599N	9" Angle Grinder	6,500 rpm

FIG. 1

K

				I
D
					A
		H
			C
F		J
					B

COMPONENTS (Fig. 1, 9, 18)

WARNING: Never modify the power tool or any part of it. Damage or personal injury could result.

A.Trigger switch

B.Lock-off button

C.Lock-on button

D.Spindle lock button

E.Spindle (Fig. 9)

F.Guard

G.Soft mount (Fig. 18)

H.Side handle

I.LED indicator

J.Anti-vibration ring

K.Dust ejection port

INTENDED USE

This grinder is designed for professional grinding, sanding, wire brushing, polishing or abrasive, cutting-off applications.

DO NOT use under wet conditions or in presence of flammable liquids or gases.

This grinder is a professional power tool. DO NOT let children come into contact with the tool. Supervision is required when inexperienced operators use this tool.

ANTI-VIBRATION REAR HANDLE (FIG. 1)

The anti-vibration ring (J) reduces handle vibration and user fatigue in extended use applications.

DUST EJECTION SYSTEM

The dust ejection system deflects debris that would be harmful to the motor and allows cleaner air to pass over the motor.

TOUGHCORD™ SYSTEM

The TOUGHCORD™ system reduces the likelihood of cord pullout.

KEYLESS GUARD

This allows for tool-free guard change and adjustment.

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E-SWITCH PROTECTION™ (DWE4597, DWE4597N, DWE4599N)

The ON/OFF trigger switch has a no-volt release function. In the event of a power outage or other unexpected shut down, the trigger switch will need to be cycled (turned on and off) to restart tool.

CLUTCH

(DWE4597, DWE4597N, DWE4599N)

The torque limiting clutch reduces the maximum reaction torque transmitted to the operator in the case of jamming a cutting disc. This feature also prevents the gearing and electric motor from stalling. The torque limiting clutch has been factory set and cannot be adjusted.

E-CLUTCH™

(DWE4597, DWE4597N, DWE4599N)

This unit is equipped with an E-Clutch™ (Electronic Clutch), which in the event of a high-load or wheel pinch, the unit will be shut off to reduce the reaction torque to the user. The switch needs to be cycled (turned on and off) to restart tool.

POWER-OFF™ OVERLOAD PROTECTION (DWE4597, DWE4597N, DWE4599N)

The power supply to the motor will be reduced in case of motor overload. With continued motor overload, the tool will shut off. The switch needs to be cycled (turned on and off) to restart tool. The tool will power off each time the current load reaches the overload current value (motor burn-up point). If continued overload shutdowns occur, apply less force/weight on the tool until the tool will function without the overload engaging.

COMPLETE ELECTRONIC CONTROL™ (DWE4597, DWE4597N, DWE4599N)

The internal electronic speed control offers consistent wheel speed while using the tool.

ELECTRONIC SOFT START (DWE4597, DWE4597N, DWE4599N)

This feature limits the initial start up momentum, allowing the speed to build up gradually over a 1 second period.

ASSEMBLY AND ADJUSTMENTS

WARNING: To reduce the risk of injury, turn unit off and disconnect it from power source before installing and removing accessories, before adjusting or when making repairs. An accidental start-up can cause injury.

Attaching Side Handle (Fig. 2)

The side handle (H) can be fitted to either side or the FIG. 2

top of the gear case in the threaded holes. The side positions are designed for optimized balance in surface finishing and grinding applications. The

side handle must be used at all times to maintain proper control of the tool. Before using the tool,

check that the handle is tightened securely. NOTE: The D28499 offers 5 handle locations for additional versatility.

ANTI-VIBRATION SIDE HANDLE (DWE4597, DWE4597N, DWE4599N)

The anti-vibration side handle reduces vibration and user fatigue in extended use applications.

GEAR CASE GRIP (FIG. 3) (DWE4559CN, DWE4559CNG)

The DWE4559CN and DWE4559CNG include a soft grip cover for the gear case that can be used as a gripping surface only for pipeline grinding and wire brushing where the edge of the wheel is used for grinding and cleaning and precise control is needed to ensure accuracy. As with any gripping surface, maintain firm grip during use.

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The side handle should be used as the secondary grip surface for all other applications.

FIG. 3

The gear case grip may be purchased at additional cost. Please call 1-800-4-DEWALT (1-800-433-9258) or visit our website: www.dewalt.com.

Rotating the Gear Case (Fig. 4)

For applications in which a tool will be FIG. 4

dedicated for uses in edge grinding and finishing work, the gear case may be rotated 90° left or right of its original position.

1. Remove the four corner screws attaching the gear case to motor housing.

2.Without separating the gear case from motor housing, rotate the gear case head to desired position.

NOTE: If the gear case and motor housing become separated by more than 1/8" (3.17 mm), the tool must be serviced and re-assembled by a DEWALT service center. Failure to have the tool serviced may cause brush, motor and bearing failure.

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3.Reinstall screws to attach the gear case to the motor housing. Tighten screws to 20 in.-lbs. torque. Overtightening could cause screws to strip.

Rotating the Rear Handle (Fig. 5)

(D28499 ONLY)	FIG. 5
1. Unlock the rear handle by
pulling out the Handle Release
Lever (L).
2. Rotate handle into available
0°, 30°, 60°, or 90° position
left OR right of center.
3. Push in the handle release
		L
lever.

4.Before turning the tool on, ensure that the handle is locked into a position and the handle release lever has returned to the original position flush with the tool housing.

Wheel Mounting Accessories and Attachments

It is important to choose the correct guards, backing pads and flanges to use with grinder accessories. Refer to pages 11–13 for information on choosing the correct wheel mounting accessories.

ATTACHMENTS

Attachments designed specifically for this grinder can be purchased through DEWALT dealers and DEWALT Factory Service centers.

9" Type 27 guard	D284939
9" Type 28 guard	D284938
7" Type 27 guard	D284937
5"–6" Type 11 flaring cup guard with flange	D284936
4" Type 11 flaring cup guard with flange	D284934

Type 11 flaring cup wheel backing flange	N197992
Type 1 flange set	D284932
7" Type 1 guard	D284931
Grinding backing flange	54339-00
Clamp nut	22191-00
Wheel wrench	61820-01
Soft mount spindle protector	445928-01

WARNING: Accessories must be rated for at least the speed recommended on the tool warning label. Wheels and other accessories running over their rated accessory speed may fly apart and cause injury. Threaded accessories must have a 5/8"–11 hub. Every unthreaded accessory must have a 7/8" (22.2 mm) arbor hole. If it does not, it may have been designed for a circular saw. Use only the accessories shown on pages 11–13 of this manual. Accessory ratings must always be above tool speed as shown on tool nameplate.

Mounting Guard

MOUNTING AND REMOVING GUARD (FIG. 6, 7)

WARNING: Guards must be used with all grinding wheels, cutting wheels, sanding flap discs, wire brushes, and wire wheels. Guard modification that results in reduced coverage of the accessory could result in severe personal injury. The tool may be used without a guard only when sanding with conventional sanding discs. A Type 27 guard (intended for use with depressed center grinding wheels [Type 27 and Type 29], sanding flap discs, wire wheels and wire cup brushes) is available at extra cost from your local dealer or authorized service center. Grinding and cutting with wheels other than Type 27 and 29 require different accessory guards not included with tool. A Type 1 guard is provided for use with the Type 1 wheel. Mounting instructions for accessory guards are shown below and are also included in the accessory package.

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Sanding Flap Discs

soft mount	soft mount
445928-01	445928-01
Type 27 guard	Type 27 guard
D284937 7"	D284937 7"
D284939 9"	D284939 9"
	backing flange
hubbed sanding	54339-00
flap disc
	non-hubbed sanding
	flap disc
	clamp nut
	22191-00

NOTE: Wheel size must match guard size; i.e., a new 7" wheel may not be used with a 9" guard. The bottom surface of wheel must be inside the bend of the guard lip.

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soft mount 445928-01

Type 27 guard

D284937 7"

D284939 9"

Type 27 hubbed wheel

soft mount 445928-01

Type 28 guard

D284938 9"

Type 28 hubbed wheel

Grinding Wheels

soft mount 445928-01

Type 27 guard

D284937 7"

D284939 9"

backing flange 54339-00

Type 27 non-hubbed wheel

clamp nut 22191-00

soft mount 445928-01

Type 28 guard

D284938 9"

backing flange 54339-00

Type 28 non-hubbed wheel

clamp nut 22191-00

Sanding Discs

soft mount 445928-01

rubber backing pad

sanding disc

clamp nut

NOTE: Wheel size must match guard size; i.e., a new 7" wheel may not be used with a 9" guard. The bottom surface of wheel must be inside the bend of the guard lip.

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Wire Wheels

soft mount 445928-01

Type 27 guard

D284937 7"

D284939 9"

wire cup brush

soft mount 445928-01

Type 27 guard

D284937 7"

D284939 9"

wire wheel

Flaring Cup Stones

Type 11 flaring cup guard

D284934 4"

D284936 5"– 6"

backing flange N197992

flaring cup stone

Cutting Wheels

Type 1 guard	Type 1 guard
D284931	D284931
backing flange	backing flange
N188469	N188469
abrasive cutting wheel	diamond cutting wheel
clamp nut	clamp nut
401678-06	401678-06

NOTE: Wheel size must match guard size; i.e., a 7" wheel may not be used with a 9" guard.

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1.Open the guard latch (M), and align the lugs (N) on the guard with the slots on the gear case (O). This will align the lugs on the guard with the slots on the gear case cover.

2.Push the guard down until the guard lugs engage and can rotate freely into the groove on the gear case hub.

3.With the guard latch open, rotate the guard (F) into the desired working position. The guard body should be positioned between the spindle and the operator to provide maximum operator protection.

FIG. 6

N

M

O

F

4. Close the guard latch to secure the guard on the gear case. You should not be able to rotate the guard by hand when the latch is closed. Do not

operate the grinder with a loose guard or with the guard latch in open position.

5. To remove the guard, follow the procedure above in reverse order.

NOTE: The guard is pre-adjusted to the	FIG. 7
diameter of the gear case hub at the factory.
If, after a period of time, the guard becomes			P
loose, tighten the adjusting screw (P) with
guard latch in the closed position with guard
installed on the tool.

CAUTION: Do not tighten the adjusting screw with the guard latch in the open position. Undetectable damage to the guard or the mounting hub may result.

CAUTION: If the guard cannot be tightened by the adjusting clamp, do not use the tool. To reduce the risk of personal injury, take the tool and guard to a service center to repair or replace the guard.

NOTE: Edge grinding and cutting can be performed with Type 27 wheels designed and specified for this purpose; 1/4" (6.35 mm) thick wheels are designed for surface grinding while 1/8" (3.17 mm) wheels are designed for edge grinding. Cutting can also be performed by using a Type 1 wheel and a Type 1 guard.

OPERATION

WARNING: To reduce the risk of injury, turn unit off and disconnect it from power source before installing and removing accessories, before adjusting or when making repairs. An accidental start-up can cause injury.

Switch (Fig. 8)

CAUTION: Before connecting the tool to a power source or after a power failure, depress and release the trigger switch (A) once without depressing the lock-on button (C) to ensure that the switch is in the off position. If the trigger switch is locked on, the tool will start unexpectedly when power is reconnected to the tool. Hold the side handle and rear handle firmly to maintain control of tool at start up and during use.

TRIGGER OPERATION

To turn the tool on, depress lock-off button (B) then trigger switch (A). The trigger can be feathered as long as the lock-off button is depressed. The tool will remain running while the trigger is depressed. Turn the tool off by releasing the trigger.

FIG. 8

C

B A

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TRIGGER OPERATION WITH LOCK-ON FEATURE

To turn tool on, depress trigger. Depress and hold lock-on button (C) while releasing trigger. Lock-on button will remain depressed and tool will remain on.

To turn the tool off, depress and release trigger. The lock-on button will pop out, permitting the trigger to disengage and causing the tool to turn off.

NOTE: Allow the tool to reach full speed before touching tool to work surface. Lift the tool from the work surface before turning the tool off.

CAUTION: Make sure the wheel has come to a complete stop before setting the tool down.

	SPINDLE LOCK BUTTON (FIG. 9)	FIG. 9
	The spindle lock button (D) is provided to	D
	prevent the spindle from rotating when
	installing or removing wheels.
	NOTICE: To reduce the risk of damage to
	the tool, do not engage the spindle lock
	button while the tool is operating. Damage
	to the tool will result and attached accessory
	may spin off possibly resulting in injury.

To engage the lock, depress the spindle lock button (D) and rotate the spindle until you are unable to rotate the spindle further.

Mounting and Using Depressed Center Grinding Wheels and Sanding Flap Discs

MOUNTING AND REMOVING HUBBED WHEELS

Hubbed wheels install directly on the 5/8"—11 threaded spindle.

1.Thread the wheel on the spindle by hand, seating the wheel against the soft mount.

2.Depress the spindle lock button and use a wrench to tighten the hub of the wheel.

3. Reverse the above procedure to remove the wheel.

CAUTION: Failure to properly seat the wheel against the soft mount before turning the tool on may result in damage to the tool or the wheel.

MOUNTING NON-HUBBED WHEELS		FIG. 10
Depressed center, Type 27 grinding wheels
must be used with available accessory flanges.
See the chart on pages 11–13 of this manual
for more information.		Q
1.	Install the metal backing flange (Q) on	E
	spindle (E) against the soft mount.
2.	Place wheel against the backing flange,
	centering the wheel on the backing flange
	pilot.
3.	While depressing the spindle lock button,
	thread the clamp nut (R) on spindle,
	piloting the raised hub on clamp nut in the
	center of grinding wheel.

4.Tighten the clamp nut with a wrench.

5.Reverse the above procedure to remove the wheel.

SURFACE GRINDING WITH GRINDING WHEELS (FIG. 11)

1.	Allow the tool to reach full speed before FIG. 11
	touching the tool to the work surface.
2.	Apply minimum pressure to the work
	surface, allowing the tool to operate at
	high speed. Grinding rate is greatest			20˚–30˚
	when the tool operates at high speed.
3.	Maintain a 20° to 30° angle between the tool		and work surface.

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4.Continuously move the tool in a forward and back motion to avoid creating gouges in the work surface.

5.Remove the tool from work surface before turning tool off. Allow the wheel to stop rotating before laying the tool down.

EDGE GRINDING WITH GRINDING WHEELS (FIG. 12)

WARNING: Wheels used for cutting and edge grinding may break or kickback if they bend or twist while the tool is being used to do cut-off work or deep grinding. To reduce the risk of serious injury, limit the use of these wheels with a standard Type 27 guard to shallow cutting and notching (less than 1/2" [13 mm] in depth). The open side of the guard must be positioned away from the operator. For deeper cutting with a Type 1 cut-off wheel, use a closed Type 1 guard. Refer to pages 11–13 for more information.

1.Allow the tool to reach full speed before touching the tool to the work surface.

2. Apply minimum pressure to the work surface, FIG. 12

allowing the tool to operate at high speed. Grinding rate is greatest when the tool operates at high speed.

3. Position yourself so that the open-underside of the wheel is facing away from you.

4. Once a cut is begun and a notch is established in the workpiece, do not change the angle of the cut. Changing the angle will cause the wheel to bend and may cause wheel breakage. Edge grinding wheels are not designed to withstand side pressures caused by bending.

5.Remove the tool from the work surface before turning the tool off. Allow the wheel to stop rotating before laying the tool down.

WARNING: Do not use edge grinding/cutting wheels for surface grinding applications because these wheels are not designed for side pressures encountered with surface grinding. Wheel breakage and serious personal injury may result.

SURFACE FINISHING WITH SANDING FLAP DISCS (FIG. 13)

1.	Allow the tool to reach full speed before	FIG. 13
	touching the tool to the work surface.
2.	Apply minimum pressure to work
	surface, allowing the tool to operate at
	high speed. Sanding rate is greatest
	when the tool operates at high speed.			5˚–10˚
3.	Maintain a 5° to 10° angle between the
	tool and work surface.

4.Continuously move the tool in a forward and back motion to avoid creating gouges in the work surface.

5.Remove the tool from work surface before turning tool off. Allow the wheel to stop rotating before laying the tool down.

MOUNTING SANDING BACKING PADS (FIG. 14)

NOTE: Guard may be removed when using sanding backing pads.

	WARNING: Proper guard must be reinstalled	FIG. 14
	for grinding wheel, cutting wheel, sanding flap		T
	disc, wire brush or wire wheel applications after R
	sanding applications are complete.
	1. Place or appropriately thread backing pad
	(S) on the spindle.
	2. Place the sanding disc (T) on the backing
	pad (S).
	3. While depressing the spindle lock button,
	thread clamp nut (R) on spindle, piloting the		S
	raised hub on the clamp nut into the center
	of sanding disc and backing pad.

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4.Tighten the clamp nut by hand. Then depress the spindle lock button while turning the sanding disc until the sanding disc and clamp nut are snug.

5.To remove the wheel, grasp and turn the backing pad and sanding disc while depressing the spindle lock button.

USING SANDING BACKING PADS (FIG. 15)

Choose the proper grit sanding discs for your application. Sanding discs are available in various grits. Coarse grits yield faster material removal rates and a rougher finish. Finer grits yield slower material removal and a smoother finish.

Begin with coarse grit discs for fast, rough material removal. Move to a medium grit paper and finish with a fine grit disc for optimal finish.

Coarse	16–30 grit
Medium	36–80 grit
Fine Finishing	100–120 grit
Very Fine Finishing	150–180 grit

1.Allow the tool to reach full speed before touching tool to the work surface.

2.Apply minimum pressure to work surface, allowing the tool to operate at high speed. Sanding rate is greatest when the tool operates at high speed.

3.Maintain a 5° to 15° angle between the tool and work surface. The sanding disc should contact approximately 1" (25.4 mm) of work surface.

4. Move the tool constantly in a straight line	FIG. 15
to prevent burning and swirling of work
surface. Allowing the tool to rest on the
work surface without moving, or moving
the tool in a circular motion causes				5˚–15˚
burning and swirling marks on the work
surface.

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5.Remove the tool from work surface before turning tool off. Allow the wheel to stop rotating before laying the tool down.

Precautions To Take When Sanding Paint

1.Sanding of lead based paint is NOT RECOMMENDED due to the difficulty of controlling the contaminated dust. The greatest danger of lead poisoning is to children and pregnant women.

2.Since it is difficult to identify whether or not a paint contains lead without a chemical analysis, we recommend the following precautions when sanding any paint:

PERSONAL SAFETY

1.No children or pregnant women should enter the work area where the paint sanding is being done until all clean up is completed.

2.A dust mask or respirator should be worn by all persons entering the work area. The filter should be replaced daily or whenever the wearer has difficulty breathing.

NOTE: Only those dust masks suitable for working with lead paint dust and fumes should be used. Ordinary painting masks do not offer this protection. See your local hardware dealer for the proper NIOSH-approved mask.

3.NO EATING, DRINKING or SMOKING should be done in the work area to prevent ingesting contaminated paint particles. Workers should wash and clean up BEFORE eating, drinking or smoking. Articles of food, drink, or smoking should not be left in the work area where dust would settle on them.

ENVIRONMENTAL SAFETY

1.Paint should be removed in such a manner as to minimize the amount of dust generated.

2.Areas where paint removal is occurring should be sealed with plastic sheeting of 4 mils thickness.

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3.Sanding should be done in a manner to reduce tracking of paint dust outside the work area.

CLEANING AND DISPOSAL

1.All surfaces in the work area should be vacuumed and thoroughly cleaned daily for the duration of the sanding project. Vacuum filter bags should be changed frequently.

2.Plastic drop cloths should be gathered up and disposed of along with any dust chips or other removal debris. They should be placed in sealed refuse receptacles and disposed of through regular trash pick-up procedures.

During clean up, children and pregnant women should be kept away from the immediate work area.

3.All toys, washable furniture and utensils used by children should be washed thoroughly before being used again.

Mounting and Using Wire Brushes and Wire Wheels

Wire cup brushes or wire wheels screw directly on the grinder spindle without the use of flanges. Use only wire brushes or wheels provided with a 5/8"–11 threaded hub. A Type 27 guard is required when using wire brushes and wheels.

CAUTION: To reduce the risk of personal injury, wear work gloves when handling wire brushes and wheels. They can become sharp.

CAUTION: To reduce the risk of damage to the tool, wheel or brush must not touch guard when mounted or while in use.

Undetectable damage could occur to the accessory, causing wires to fragment from accessory wheel or cup.

MOUNTING WIRE CUP BRUSHES AND WIRE WHEELS

1. Thread the wheel on the spindle by hand.

2.Depress spindle lock button and use a wrench on the hub of the wire wheel or brush to tighten the wheel.

3.To remove the wheel, reverse the above procedure.

NOTICE: To reduce the risk of damage to the tool, properly seat the wheel hub before turning the tool on.

USING WIRE CUP BRUSHES AND WIRE WHEELS (FIG. 16)

Wire wheels and brushes can be used for removing rust, scale and paint, and for smoothing irregular surfaces.

NOTE: The same precautions should be taken when wire brushing paint as when sanding paint (refer to Precautions To Take When Sanding Paint).

1.Allow the tool to reach full speed before touching the tool to the work surface.

2.Apply minimum pressure to work surface, allowing the tool to operate at high speed. Material removal rate is greatest when the tool operates at high speed.

3.Maintain a 5° to 10° angle between the tool and work surface for wire cup brushes.

4.Maintain contact between the edge of the wheel and the work surface with wire wheels.

5. Continuously move the tool in a forward and	FIG. 16
back motion to avoid creating gouges in
the work surface. Allowing the tool to rest
on the work surface without moving, or
moving the tool in a circular motion causes	5˚–10˚
burning and swirling marks on the work
surface.

6.Remove the tool from the work surface before turning the tool off. Allow the tool to stop rotating before setting it down.

CAUTION: Use extra care when working over an edge, as a sudden sharp movement of grinder may be experienced.

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U

FIG. 17

Mounting and Using Flaring Cup

(Type 11) Wheel

MOUNTING FLARING CUP WHEEL GUARD (FIG. 17)

WARNING: The flaring cup wheel guard is not included with this tool. Flaring cup wheels require proper flanges and guards. 4" flaring cup wheel guard D284934 and 5"– 6" flaring cup wheel guard D284936 are available as accessories and include proper flange. Failure to use the proper flange and guard can result in injury resulting from wheel breakage and wheel contact.

1. Install the guard as shown in Fig. 17. 2. Guard body should be positioned between the spindle and the operator to provide maximum operator protection. 3. Securely tighten the two clamping screws

(U) supplied with the guard.

MOUNTING FLARING CUP WHEEL (FIG. 18)

1.Remove the soft mount (G).

2.Install the flaring cup wheel backing flange, aligning the flats on the spindle (V) with the flats on backing flange (Q).

3.Thread the flaring cup wheel on spindle by hand, seating wheel against backing flange.

4.Depress the spindle lock button and tighten the wheel by hand.

5.To remove the wheel, reverse the above procedure.

FIG. 18	G	Q
		V

CAUTION: Failure to properly seat the wheel against backing flange before turning the tool on may result in damage to the tool or the wheel.

NOTE: Adjust the guard skirt so that only 1/8" of the wheel is exposed by loosening the bolts, allowing the guard to lengthen. Tighten the guard skirt bolts securely before using the grinder.

USING A FLARING CUP WHEEL (FIG. 19)

Flaring cup wheels are designed for heavy material removal.

1.	Allow the tool to reach full speed before	FIG. 19
	touching tool to work surface.
2.	Apply minimum pressure to work
	surface, allowing the tool to operate at	5˚–10˚
	high speed.

3.Maintain a 5˚ to 10˚ angle between the tool and the work surface.

4.Continuously move the tool in a forward and back motion to avoid creating gouges in the work surface.

5.Remove the tool from work surface before turning tool off. Allow the tool to stop rotating before setting it down.

Mounting and Using Cutting

(Type 1) Wheels (Fig. 20, 21)

Cutting wheels include diamond wheels and abrasive discs. Abrasive cutting wheels for metal and concrete use are available. Diamond blades for concrete cutting can also be used.

WARNING: A closed, two-sided cutting wheel guard is included with this tool and is required when using cutting wheels. Failure to use proper flange and guard can result in injury resulting from wheel breakage and wheel contact. See pages 11–13 for more information.

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MOUNTING CLOSED (TYPE 1) GUARD FIG. 20 N

1. Open the guard latch (M), and align the
	M
lugs (N) on the guard with the slots on
the hub (O). This will align the lugs with
slots on the gear case cover. Position
the guard facing backward.
2. Push the guard down until the guard		O
lug engages and rotates freely in the
groove on the gear case hub.
3. Rotate guard (F) into desired working
			F
position. The guard body should be
positioned between the spindle and the
operator to provide maximum operator
protection.
4. Close the guard latch to secure the
guard on the gear case cover. You
should be unable to rotate the guard
by hand when the latch is in closed
position. Do not operate grinder with a
loose guard or with the guard latch in
open position.

5. To remove the guard, follow the procedure above in reverse order.

NOTE: The guard is pre-adjusted to the	FIG. 21
diameter of the gear case hub at the factory.				P
If, after a period of time, the guard becomes
loose, tighten the adjusting screw (P) with
the guard latch in the closed position with
guard installed on the tool.

NOTICE: To reduce the risk of damage

to the tool, do not tighten adjusting screw with guard latch in open position. Undetectable damage to guard or mounting hub may result.

MOUNTING CUTTING WHEELS (FIG. 22)

CAUTION: Matching diameter threaded backing flange and clamp nut (included with tool) must be used for cutting wheels.

1.Remove soft mount (G).

2.Install wheel backing flange, aligning flats on spindle (X) with flats on backing flange (Q).

3.Place the wheel on the backing flange, centering the wheel on the backing flange pilot.

4.Install the clamp nut, ensuring that the wheel remains centered on the backing flange.

5.Depress the spindle lock button and tighten clamp nut with wrench.

6.Reverse the above procedure to remove the wheel.

FIG. 22	X

G

USING CUTTING WHEELS

WARNING: Do not use edge grinding/cutting wheels for surface grinding applications because these wheels are not designed for side pressures encountered with surface grinding. Wheel breakage and injury may result.

1.Allow tool to reach full speed before touching tool to work surface.

2.Apply minimum pressure to work surface, allowing tool to operate at high speed. Cutting rate is greatest when the tool operates at high speed.

20

3.Once a cut is begun and a notch is established in the workpiece, do not change the angle of the cut. Changing the angle will cause the wheel to bend and may cause wheel breakage.

4.Remove the tool from work surface before turning tool off. Allow the wheel to stop rotating before laying the tool down.

MAINTENANCE

WARNING: To reduce the risk of injury, turn unit off and disconnect it from power source before installing and removing accessories, before adjusting or when making repairs. An accidental start-up can cause injury.

Cleaning

WARNING: Blow dirt and dust out of all air vents with clean, dry air at least once a week. To minimize the risk of eye injury, always wear ANSI Z87.1 approved eye protection when performing this.

WARNING: Never use solvents or other harsh chemicals for cleaning the non-metallic parts of the tool. These chemicals may weaken the plastic materials used in these parts. Use a cloth dampened only with water and mild soap. Never let any liquid get inside the tool; never immerse any part of the tool into a liquid.

ANTI-VIBRATION SIDE HANDLE

The anti-vibration side handle reduces vibration and user fatigue in extended use applications.

GEAR CASE GRIP

The gear case grip is a soft grip cover used only for pipeline grinding and wire brushing where the edge of the wheel is used for grinding and cleaning and precise control is needed to ensure accuracy.

Recommended accessories for use with your tool are available at extra cost from your local dealer or authorized service center. If you need assistance in locating any accessory, please contact DEWALT Industrial Tool Co., 701 East Joppa Road, Baltimore, MD 21286, call 1-800-4-DEWALT (1-800-433-9258) or visit our website: www. dewalt.com.

Repairs

To assure product SAFETY and RELIABILITY, repairs, maintenance and adjustment (including brush inspection and replacement) should be performed by a DEWALT factory service center, a DEWALT authorized service center or other qualified service personnel. Always use identical replacement parts.

Accessories

WARNING: Since accessories, other than those offered by DEWALT, have not been tested with this product, use of such accessories with this tool could be hazardous. To reduce the risk of injury, only DEWALT recommended accessories should be used with this product.

BAIL HANDLE

This accessory provides a wider range of holding positions when grinding and is particularly useful when surface grinding concrete.

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Thank you for your purchase. Register your product now for:

•WARRANTY SERVICE: Registering your product will help you obtain more efficient warranty service in case there is a problem with your product.

•CONFIRMATION OF OWNERSHIP: In case of an insurance loss, such as fire, flood or theft, your registration of ownership will serve as your proof of purchase.

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•FOR YOUR SAFETY: Registering your product will allow us to contact you in the unlikely event a safety notification is required under the Federal Consumer Safety Act.

Register online at www.dewalt.com/register.

Three Year Limited Warranty

DEWALT will repair, without charge, any defects due to faulty materials or workmanship for three years from the date of purchase. This warranty does not cover part failure due to normal wear or tool abuse. For further detail of warranty coverage and warranty repair information, visit www.dewalt.com or call 1-800-4-DEWALT (1-800- 433-9258). This warranty does not apply to accessories or damage caused where repairs have been made or attempted by others. This warranty gives you specific legal rights and you may have other rights which vary in certain states or provinces.

In addition to the warranty, DEWALT tools are covered by our:

1 YEAR FREE SERVICE

DEWALT will maintain the tool and replace worn parts caused by normal use, for free, any time during the first year after purchase.

90 DAY MONEY BACK GUARANTEE

If you are not completely satisfied with the performance of your DEWALT Power Tool, Laser, or Nailer for any reason, you can return it within 90 days from the date of purchase with a receipt for a full refund – no questions asked.

LATIN AMERICA: This warranty does not apply to products sold in Latin America. For products sold in Latin America, see country specific warranty information contained in the packaging, call the local company or see website for warranty information.

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FREE WARNING LABEL REPLACEMENT: If your warning labels become illegible or are missing, call 1-800-4-DEWALT (1-800-433- 9258) for a free replacement.