User Manual for DEWALT DCM849 20V 7-inch Variable Speed Rotary Polisher

Quick guide from the manual

The DEWALT DCM849 is a heavy-duty, cordless rotary polisher designed for professional applications on painted or unfinished metal, fiberglass, and composite surfaces. This manual provides essential safety, assembly, and operational instructions to ensure safe and effective use.

Product Description

The tool features a variable speed trigger (0-2200 RPM) and a speed control wheel for precise speed management. It is designed to be used with 7-inch (180 mm) polishing pads. The tool includes an auxiliary handle and a bail handle for improved control.

Assembly and Adjustments

Attaching Handles

• Auxiliary Handle: Screw the handle tightly into one of the holes on either side of the gear case.
• Bail Handle: Place the bail handle over the gear case, align the screws with the threaded holes, and tighten using the supplied hex wrench. The angle can be adjusted to 45 or 90 degrees.

Attaching Polishing Pads

The tool supports two types of pad assemblies:

• Rubber Backing Pad: Push the hub of the clamp washer through the center hole of the pad, engage the hexagonal hole in the backing pad, and thread onto the spindle while holding the spindle lock button.
• Hook and Loop Backing Pad: Insert the centering tube into the center hole of the backing pad, align the pad, and screw the backing pad onto the spindle while holding the spindle lock button.

Operation

To operate the tool, squeeze the variable speed trigger. The further the trigger is depressed, the faster the tool runs. For continuous use, squeeze the trigger fully and depress the lock button. To stop, squeeze and release the trigger. The speed control wheel allows you to set a maximum speed between 800 and 2200 RPM.

Maintenance

Regular maintenance is required to ensure tool longevity:

• Cleaning: Blow dirt and dust out of all air vents with clean, dry air at least once a week.
• Wool Ingestion Shields: Clean these shields with soap and water if they become clogged with polish or debris.
• Soft Rubber Gear Case Cover: Can be removed if necessary by unscrewing the three mounting screws.

Safety

Always wear certified safety equipment, including ANSI Z87.1 eye protection, ANSI S12.6 hearing protection, and NIOSH/OSHA respiratory protection. Do not operate the tool near flammable materials or in wet conditions. Ensure the switch is in the lock-off position when not in use.