Tornado OB 28/20 Orbital Floor Scrubber – Walk-Behind, 3530 RPM, 110 Lbs, TS550-W28-U

OB 28/20 Orbital Scrubber — High-Output Walk-Behind for Large Hard Floors

The OB 28/20 is the larger sibling of the OB 20/14 — same rectangular orbital head geometry that reaches corners, but scaled up for facilities where a 20″ cleaning path is too slow. At 3530 RPM and 132 lbs of adjustable down pressure, the OB 28/20 strips floor finish chemically-free faster than any walk-behind disk scrubber in its size class. The 20-gallon solution and 22-gallon recovery tanks run 3–4 hours without stopping, and the 300W traction motor handles ramps to 10% grade with full tanks. Lifetime warranty on isolators — the vibration dampening system that prevents repetitive strain on operators running the machine for full shifts.

OB 28/20 Orbital Speed, Pressure, and Tank Capacity

The performance gap between the OB 20/14 and the OB 28/20 is orbital speed and tank size: 3530 RPM vs 2200 RPM means more aggressive finish removal per pass, and the 20/22-gallon tanks run significantly longer than the 14/14-gallon set on the smaller machine.

• 3530 RPM orbital speed — the highest RPM in Tornado’s walk-behind orbital line; removes floor finish in fewer passes and faster cycle times than the OB 20/14
• 28″ rectangular scrub head — reaches corners and baseboards across a 28″ wide path; one pass covers edge-to-wall without secondary hand scrubbing
• 132 lbs adjustable down pressure — 20% more than the OB 20/14; handles heavy-buildup stripping on high-traffic VCT, terrazzo, and polished concrete
• 20-gal solution / 22-gal recovery tanks — the extra 6 gallons of tank vs the OB 20/14 adds roughly 45 minutes of continuous runtime before refill
• 300W traction motor — full-loaded ramp capability up to 10% grade without operator pushing
• Lifetime warranty on isolators — engineered vibration isolation prevents hand-arm vibration syndrome (HAVS) symptoms on multi-hour shifts

OB 28/20 Applications and Environments

Universities and large K-12 school districts with gymnasium floors, wide hallways, and open common areas are the primary fit for the OB 28/20 — the 28″ path and large tanks handle a typical 50,000 sq ft school building in a single overnight shift. Convention centers and large hotel ballrooms with VCT or polished concrete floors use it for finish removal cycles that would require multiple passes with a smaller orbital or standard disk machine. Large healthcare campuses with multi-building terrazzo corridors specify the OB 28/20 for both daily maintenance and periodic strip-and-recoat cycles on a single machine platform. Grocery distribution centers and food processing facilities with sealed concrete use it for daily moisture management and periodic deep scrubbing without chemical strippers.

What Ships in the Box

Every OB 28/20 ships complete with front squeegee, rear squeegee, and on-board 24V charger. Lead Acid (TS550-W28-UC) includes four 99506 6V Lead Acid batteries; AGM (TS550-W28-UG) includes four 99558 AGM batteries. Pad options — black stripping, blue cleaner, red spray buff, maroon eco — sold separately.

Specifications

Documents

OB 28/20 Spec Sheet (PDF)

OB 28/20 Operations Manual (PDF)