| Models | Clarke RA40 20D |
| Cleaning path | 20 in (51 cm), disk |
| Brush / pad size | 21 in (530 mm) disk brush or 20 in (508 mm) pad |
| Brush pressure | 33 / 66 lb (15 / 30 kg) |
| Brush speed | 155 rpm |
| Squeegee width | 28.3 in (72 cm) |
| Tank capacity | 18.5 gal (70 L) |
| Productivity at 3.7 mph | 32,560 sq ft/hr (3,025 m²/hr) |
| Productivity at 2.5 mph | 22,000 sq ft/hr (2,044 m²/hr) |
| Working speed | 3.7 mph (6 km/h) |
| Max transport speed | 3.7 mph (6 km/h) |
| Max climbing rate | 2% |
| Minimum aisle turn | 70.9 in (180 cm) |
| Brush motor | 0.6 hp (450 W) |
| Drive motor | 0.6 hp (400 W) |
| Vacuum motor | 0.42 hp (310 W) |
| Vacuum water lift | 39 in (9.8 kPa) |
| Voltage | 24 V |
| Charger | Onboard |
| Sound level | 68 dBA (±3) |
| IP protection class | IPX4 |
| Dimensions (L x W x H) | 50 x 22 x 40 in (127 x 55 x 102 cm), without squeegee |
| Gross weight | 754 lb (342 kg) |
| Model Numbers | Clarke RA40 20D OBC PH, part number 56384074 |
Technical specs may include optional equipment that is not included with all units.
Demo Clarke RA40 20D 20" Disk Rider Scrubber
Our Take (from the SES Sales Team)
“The RA40 20D is a micro rider: a 20-inch disk scrubber you sit on, sized for buildings where a walk-behind is wearing out your operator but a full-size rider won't fit through the doors or down the aisles. It is 22 inches wide without the squeegee and turns around in a 71-inch aisle, so it works in schools, retail stores, healthcare corridors and smaller warehouses.
Two features do most of the work. SmartFlow cuts the solution flow when the operator slows down for turns and edges, which keeps water from puddling and stretches the 18.5-gallon tank. The onboard chemical mixing system meters concentrate from its own reservoir, so you add detergent only when the floor needs it instead of mixing it into the whole tank.”
A 20 In Disk Micro Rider for Tight Buildings
The Clarke RA40 20D is a compact ride-on floor scrubber with a 20 in disk deck, a 28.3 in squeegee and an 18.5 gal tank. The operator sits down, steers with a wheel and cleans at up to 3.7 mph, which Clarke rates at up to 32,560 sq ft per hour.
It is 22 in wide without the squeegee and needs only a 70.9 in aisle to turn around, so it fits where a full-size rider cannot. SmartFlow lowers solution flow when the operator slows down, and the Chemical Mixing System blends concentrate from an onboard reservoir with clean water. Two scrub pressure levels, 33 lb and 66 lb, cover daily cleaning and tougher spots.
Condition: Demo. Inspected by SES technicians.

What you get
Compact Rider, Full-Size Features
SmartFlow: Less Water Left Behind on Turns and Edges
Features
Built for Easy Daily Use
- ✓Steering wheel control panel with one-touch buttons and a multifunction digital display
- ✓Low center of gravity and Safe-T-Steering to help prevent tipping
- ✓Low step-on design and a wide operator seat for easy on and off
- ✓Water-level indicator visible from the operator’s seat
- ✓Squeegee hangs on the tank for transport through doorways and for tank drying
- ✓Recovery tank tilts fully for access to the battery compartment and detergent container
- ✓Lift-off lid for cleaning the tank and debris catcher, plus an easy-flow drain hose
- ✓Rotomolded body that won’t rust or corrode

Specifications
Clarke RA40 20D at a Glance
| Spec | RA40 20D with onboard charger |
|---|---|
| Cleaning path | 20 in (51 cm), disk |
| Squeegee width | 28.3 in (72 cm) |
| Tank capacity | 18.5 gal (70 L) |
| Brush speed | 155 rpm |
| Brush pressure | 33 / 66 lb (15 / 30 kg) |
| Productivity at 3.7 mph | 32,560 sq ft/hr (3,025 m²/hr) |
| Voltage | 24 V |
| Vacuum water lift | 39 in (9.8 kPa) |
| Gross weight | 754 lb (342 kg) |
| Model numbers | Clarke 56384074 (RA40 20D OBC PH) |
Specifications from Clarke and Nilfisk. Technical specs may include optional equipment that is not included with all units.
Demo Unit Details
Not Sure the RA40 Fits Your Building?
Call 800-440-6723 and tell us about the floor, the building and the shift. We will tell you if this is the right machine. Service and warranty help











