DeWalt D28490 User manual

D28490, D28491
Heavy-Duty Angle Grinder
INSTRUCTION MANUAL

English 1
简体中文 14
25
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43
繁體中文
한국어

1
English
Congratulations!
You have chosen a DeWALT tool. Years of experience, thorough product
development and innovation make DeWALT one of the most reliable partners
for professional power tool users.
Technical Data
D28490 D28491
Voltage VAC 220-240 220-240
Type 6 6
Power input W2000 2000
No-load/rated speed min-1 6600 8500
Wheel diameter mm 230 180
Spindle diameter M14 M14
Spindle length mm 19 19
Weight kg 5.2 5.2
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.
Denotes risk of electric shock.
Denotes risk of fire.
WARNING: To reduce the risk of injury, read the instruction
manual.
General Power Tool Safety Warnings
WARNING!Readallsafetywarningsandallinstructions.
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.
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.

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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 residual current device (RCD) protected supply. Use of an RCD
reduces the risk of electric shock.
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, non-skid 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 energising 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 jewellery. Keep
your hair, clothing and gloves away from moving parts. Loose
clothes, jewellery 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.
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.

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Safety Warnings Common For Grinders, Sanding, Wire
Brushing, Polishing or Abrasive Cutting-Off Operations:
a) 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.
b) Operation such as polishing is 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.
c) 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.
d) 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.
e) 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.
f) Threaded mounting of accessories must match the grinder
spindle thread. For accessories mounted by flanges, the arbour
hole of the accessory must fit the locating diameter of the flange.
Accessories that do not match the mounting hardware of the power tool
will run out of balance, vibrate excessively and may cause loss of control.
g) Do not use a damaged accessory. Before each use inspect the
accessory such as abrasive wheel 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.
h) 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.
i) 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.
j) 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 electrical shock.
k) 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.
l) 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.
m) 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.
n) 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.
o) Do not operate the power tool near flammable materials. Sparks
could ignite these materials.

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p) Do not use accessories that require liquid coolants. Using water or
other liquid coolants may result in electrocution or shock.
FURTHER SAFETY INSTRUCTIONS FOR ALL OPERATIONS
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 grinding surface of centre depressed wheels must be
mounted below the plane of the guard lip. An improperly mounted
wheel that projects through the plane of the guard lip cannot be
adequately protected.
c) The guard must be securely attached to the power tool and
positioned for maximum safety, so the least amount of wheel
is exposed towards the operator. The guard helps to protect the
operator from broken wheel fragments, accidental contact with wheel
and sparks that could ignite clothing.
d) 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.
e) 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.
f) 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

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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
• Do not use Type 11 (flaring cup) wheels on this tool. Using
inappropriate accessories can result in injury.
• Always use side handle. Tighten the handle securely.The side
handle should always be used to maintain control of the tool at all times.
Residual Risks
In spite of the application of the relevant safety regulations and the
implementation of safety devices, certain residual risks cannot be avoided.
These are:
– Impairment of hearing.
– Risk of personal injury due to flying particles.
– Risk of burns due to accessories becoming hot during operation.
– Risk of personal injury due to prolonged use.
Markings on Tool
The following pictograms are shown on the tool:
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 operations, 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.
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.

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Read instruction manual before use.
Wear ear protection.
Wear eye protection.
DATE CODE POSITION (FIG. 1)
The date code (X), which also includes the year of manufacture, is printed
into the housing.
Example:
2015 XX XX
Year of Manufacture
Package Contents
The package contains:
1 Angle grinder
1 Guard
1 Side handle
1 Flange set
1 Two-pin spanner
1 Instruction manual
• Check for damage to the tool, parts or accessories which may have
occurred
during transport.
• Take the time to thoroughly read and understand this manual prior to
operation.
Description (Fig. 1)
WARNING: Never modify the power tool or any part of it.
Damage or personal injury could result.
A. On/off trigger
C. Spindle lock
D. Spindle
E. Guard
F. Guard screw
G. Side handle
H. Lock-on button
I. Two-pin spanner
J. Backing flange
K. Threaded clamp nut
INTENDED USE
Your heavy-duty angle grinder has been designed for professional grinding,
sanding, wire brush and cutting.
DO NOT use under wet conditions or in the presence of flammable liquids or
gases.
These heavy-duty angle grinders are professional power tools.
A
H
G
C
F
D
E
FIG. 1

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DO NOT let children come into contact with the tool. Supervision is required
when inexperienced operators use this tool.
• Young children and the infirm. This appliance is not intended for use
by young children or infirm persons without supervision.
• This product is not intended for use by persons (including children)
suffering from diminished physical, sensory or mental abilities; lack of
experience, knowledge or skills unless they are supervised by a person
responsible for their safety. Children should never be left alone with this
product.
Electrical Safety
The electric motor has been designed for one voltage only. Always check
that the power supply corresponds to the voltage on the rating plate.
Your DeWALT is tool is double insulated
in accordance with IEC60745, therefore
no earth wire is required.
WARNING: 115 V units have to be operated via a fail-safe
isolating transformer with an earth screen between the
primary and secondary winding.
If the supply cord is damaged, it must be replaced by a specially prepared
cord available through the DeWALT service organization.
Using an Extension Cable
An extension cord should not be used unless absolutely necessary. If
an extension cable is required, use an approved 3–core extension cable
suitable for the power input of this tool (see Technical Data).The minimum
conductor size is 1.5 mm2; the maximum length is 30 m.
When using a cable reel, always unwind the cable completely.
ASSEMBLY AND ADJUSTMENTS
WARNING: To reduce the risk of serious personal injury,
turn tool off and disconnect tool from power source
before making any adjustments or removing/installing
attachments or accessories. Before reconnecting the tool,
depress and release the trigger switch to ensure that the tool is off.
Attaching Side Handle (fig. 2)
WARNING: Before using the tool, check that the handle is
tightened securely.
WARNING: The side handle should always be used to
maintain control of the tool at all times.
Screw the side handle (G) tightly into one of the holes (M) on either side of
the gear case.
Mounting and Removing a Keyed Guard (fig. 3)
WARNING: To reduce the risk of serious personal injury,
turn tool off and disconnect tool from power source
before making any adjustments or removing/installing
attachments or accessories. Before reconnecting the tool,
depress and release the trigger switch to ensure that the tool is off.
CAUTION: Guards must be used with this grinder.
M
G
FIG. 2
N
O
FIG. 3

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When using the grinder for cutting metal or masonry a Type 1 guard MUST
be used. Type 1 guards are available at extra cost from DeWALT distributors.
NOTE: Please refer to the Grinding and Cutting Accessory Chart at the
end of this section to show other accessories that can be used with these
grinders.
1. Place the angle grinder on a table, spindle (D) up.
2. Align the lugs (N) with the notches (O).
3. Press the guard (E) down and rotate it to the required position.
4. Securely tighten the screw (F).
5. To remove the guard, slacken the screw.
CAUTION: If the guard cannot be tightened by the
adjusting screw, 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.
Fitting and Removing a Grinding or Cutting Disc (fig. 1,
4, 5)
WARNING: Do not use a damaged disc.
1. Place the tool on a table, guard up.
2. Fit the backing flange (J) correctly onto the spindle (D) (fig. 4).
3. Place the disc (O) on the backing flange (J) (fig.5). When fitting a disc
with a raised centre, make sure that the raised centre (P) is facing the
backing flange (J).
4. Screw the threaded clamp nut (L) onto the spindle (D) (fig. 6):
a. The ring on the threaded clamp nut (K) must face towards the disc
when fitting a grinding disc (fig. 5a);
b. The ring on the threaded clamp nut (K) must face away from the disc
when fitting a cutting disc (fig. 5b).
5. Press the spindle lock button (C) and rotate the spindle (D) until it locks
in position.
6. Tighten the threaded clamp nut (K) with the two-pin spanner supplied.
7. Release the spindle lock.
8. To remove the disc, loosen the threaded clamp nut (L) with the two-pin
spanner.
Fitting and Removing a
Backing pad/Sanding sheet
(fig. 1, 4, 6)
1. Place the tool on a table or flat surface, with the guard facing up.
2. Remove the backing flange (J).
3. Place the rubber backing pad correctly onto the spindle (D).
4. Place the sanding sheet on the rubber backing pad.
FIG. 4
I
K
J
FIG. 5
KO
J
P
a.
b.
D
KO
J
P
D