DeWalt DWE4020 Instruction Manual page 49

For continuous operation, slide the switch toward the front of the tool
and press the forward part of the switch inward. To stop the tool while
operating in continuous mode, press the rear part of the slider switch
and release.
SPINDLE LOCK (FIG. 6)
The spindle lock button (A) is provided to
prevent the spindle from rotating when
installing or removing wheels. Operate the
spindle lock only when the tool is turned off,
unplugged from the power supply, and has
come to a complete stop. Do not engage the
spindle lock button while the tool is operating
because damage to the tool will result. To
engage the lock, depress the spindle lock button 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 (M14) threaded spindle.
Thread of accessory must match thread of spindle.
1. Remove backing flange (D) by pulling away from the tool.
2. Thread the wheel on the spindle by hand.
3. Depress the spindle lock button and use a wrench to tighten the
hub of the wheel.
4. Reverse the above procedure to remove the wheel.
NOTICE: Failure to properly seat the wheel before turning the tool on
may result in damage to the tool or the wheel.
MOUNTING NON-HUBBED WHEELS (FIG. 7)
Depressed center Type 27 grinding wheels must be used with
included flanges. Refer to Accessories and Attachments for more
information.
1. Install the backing flange (D) on spindle (B) with the raised section
(pilot) against the wheel. Be sure the backing flange recess is
seated onto the flats of the spindle by pushing and twisting the
flange before placing wheel.
2. Place wheel against the backing flange, centering the wheel on
the raised section (pilot) of the backing flange.
FIG. 6
3. While depressing the spindle lock button, thread the clamp nut
A
(E) on spindle. If the wheel you are installing is more than 1/8"
(3.31mm) thick, place the threaded clamp nut on the spindle so
that the raised section (pilot) fits into the center of the wheel. If the
wheel you are installing is 1/8" (3.31 mm) thick or less, place the
threaded clamp nut on the spindle so that the raised section (pilot)
is not against the wheel.
4. While depressing the spindle lock button, tighten the clamp nut
with a wrench.
5. To remove the wheel, depress the spindle lock button and loosen
the threaded clamp nut with a wrench.
47
FIG. 7
D
B
E
1/4" WHEELS
1/8" WHEELS
(6.35 mm)
(3.31 mm)
Clamp Nut
Clamp Nut
Backing Flange
Backing Flange