1.To start the tool, slide the ON/OFF switch (A) toward the front of the tool.
2.To stop the tool, release the ON/OFF switch.
3. For continuous operation, slide the switch toward the front of the tool and
press the forward part of the switchA inward.
4.To stop the tool while operating in continuous mode, press the rear part of the switch and release.
NOTE: To reduce unexpected tool movement, do not switch the tool on or off while under load conditions.
CAUTION: Hold the side handle and body of the tool firmly to maintain control of the tool at start up and during use and until the wheel or accessory stops rotating. Make sure the wheel has come to a complete stop before laying the tool down.
CAUTION: Allow the tool to reach full speed before touching tool to the work surface. Lift the tool from the work surface before turning the tool off.
Spindle Lock
The spindle lock pin (E) is provided to prevent the spindle from rotating when installing or removing wheels. Operate the spindle lock pin only when the tool is turned off and unplugged from the power supply. Do not engage the spindle lock while the tool is operating because damage to the tool will result E and attached accessory may spin off possibly resulting in injury.
To engage the lock, depress the spindle lock button (E) 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 GUARD
CAUTION: Turn off and unplug the tool before making any adjustments or removing or installing attachments or acces- sories. Before reconnecting the tool, actuate and release switch to ensure that the tool is off.
CAUTION: Guards must be used with all grinding wheels, sand- ing flap discs, wire brushes, and wire wheels. The tool may be used without a guard only when sanding with conventional sanding discs. DEWALT model DW400 is provided with a guard intended for use with depressed center wheels (Type 27) and hubbed grinding wheels (Type 27). The same guard is designed for use with sanding flap discs (Type 27 and 29) and wire cup brushes and wire wheels. 
CAUTION: Type 1 Abrasive and Diamond
CAUTION: Proper guard must be
1.Align the openings on the guard with the holes on the grinder, as shown.
2. With guard skirt facing away from grinder, rotate the guard into desired working position. The guard should be posi- tioned between the spindle and the operator to provide maximum operator protection.
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