Mercury DC-21-2000 Ultra D.C. High-Speed Burnisher – 21", 2000 RPM
Mercury DC-21-2000 Ultra D.C. Burnisher – 21" High-Speed Floor Polisher at 2000 RPM
The DC-21-2000 is Mercury's largest high-speed burnisher, pairing a 21" apron with a 2000 RPM D/C rectified motor for maximum gloss output per pass. Compared to the DC-19-2000, the additional 2" of apron width covers more floor without adding speed — the two machines run the same motor and RPM, so the DC-21-2000 is the right choice when open floor space allows the larger footprint to work unobstructed. The front caster assembly controls pad pressure independently of machine weight, producing an even finish without the operator pushing down or pulling back on the handle.
DC-21-2000 Motor, Pad Pressure, and Chassis Design
- Motor: 1.5 HP D/C rectified, 15 Amp — eliminates burnouts and startup torque issues
- Speed: 2000 RPM — high-speed burnishing range, restores gloss without stripping
- Apron size: 21" polished aluminum — full-wrap non-marking bumpers protect walls and baseboards
- Pad pressure: front caster assembly with flexible pad holder and threaded pad-centering device — levels pad contact across uneven floors
- Chassis: polished aluminum — adds structural weight, improving pad-to-floor contact
- Operating wheels: 6" non-marking; transport wheels: 4" non-marking
- Power cord: 50-ft. 14/3-gauge safety cord — plugs at handle base for easy service access
- Machine weight: 84 lbs.
Where the DC-21-2000 Gets Used
The 21" size and 2000 RPM combination suits supermarket main aisles, airport terminals, hotel lobby corridors, and large-area VCT floors where production rate matters and tight navigation is not a constraint. At 2000 RPM, the friction generated between pad and floor creates sufficient heat to melt and re-spread finish polymers, producing a mirror gloss without chemical application. The large apron reduces the number of passes required on wide floors, cutting total burnish time compared to smaller machines on the same square footage.
Pro Application Details for the DC-21-2000
High-speed burnishers in the 2000 RPM range work with natural fiber pads, white pads, or tan pads — never black, green, or blue pads, which are too aggressive at this speed and damage finish. The front caster assembly on the DC-21-2000 is the key pad-pressure control mechanism: it floats the front of the machine on a small roller, keeping the pad flat against the floor regardless of minor surface irregularities. The interlock switch and non-conductive dual triggers prevent accidental starts and reduce electric shock risk on wet floors. Two YouTube videos covering operation and setup are available below.
| Attribute | Details |
|---|---|
| Model | DC-21-2000 |
| Motor | 1.5 HP D/C Rectified, 15 Amps |
| Speed | 2000 RPM |
| Apron Size | 21" |
| Chassis | Polished Aluminum |
| Operating Wheels | 6" Non-Marking |
| Transport Wheels | 4" Non-Marking |
| Power Cord | 50-ft. 14/3-gauge safety cord |
| Machine Weight | 84 lbs. |
Documents
Mercury DC-21-2000 Owners Manual
Mercury DC-21-2000 Wiring Diagram