Motor Brushes; Maintenance - DeWalt DWE490 Instruction Manual

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 pick­up 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.
Edge Grinding and Cutting

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.

CAUTION: Wheels used for edge grinding and
cutting may break or kick back if they bend or twist
while the tool is being used. In all edge grinding/
cutting operations, the open side of the guard must be
positioned away from the operator.
NOTICE: Edge grinding/cutting with a Type 27 wheel
must be limited to shallow cutting and notching—
less than 13 mm in depth when the wheel is new.
Reduce the depth of cutting/notching equal to the
reduction of the wheel radius as it wears down. Refer
to the accessories Chart for more information.
Edge grinding/cutting with a Type 1 wheel requires
usage of a Type 1 guard. For deeper cutting with a
type 1 wheel, use a closed, type 1 guard. Type 1 guards
are available at extra cost from your local dealer or
authorized service center.
1. Allow the tool to reach full speed before touching the
tool to the work surface.
2. Apply minimum pressure to the work surface, allowing
the tool to operate at high speed. Grinding/cutting rate
is greatest when the tool operates at high speed.
3. Position yourself so that the open­underside 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 tool to stop rotating before laying
it down.

MAINTENANCE


WARNING: To reduce the risk of serious personal
injury, turn unit off and disconnect it from
power source before making any adjustments or
removing/installing attachments or accessories.
An accidental start-up can cause injury.
Your D WALT power tool has been designed to operate
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over a long period of time with a minimum of maintenance.
Continuous satisfactory operation depends upon proper
tool care and regular cleaning.
Lubrication
Your power tool requires no additional lubrication.

Motor Brushes

When brushes become worn, the tool will automatically
stop, preventing damage to the motor. Brush replacement
should be performed by D WALT authorized service centers
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or other qualified service personnel. Qualified service
personnel should follow the procedures below when
replacing motor brushes.
1. Remove the brush doors located on the sides of motor
housing.
2. To remove the brush, hold the female terminal, which
is attached to the brush lead wire, and disconnect the
female terminal from the male terminal.
3. Pull the brush straight up out of the brush holder.
4. Replace brushes, in pairs, with original D
available from D WALT authorized service centers.
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5. Ensure that the brushes slide freely in brush box.
6. Reconnect the brush lead wire to brush box terminal.
7. Reinstall the brush doors before using the tool. Torque
screws to 10 in­lbs, maximum. Overtightening may
cause screws to strip.
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 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.
Accessories

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