Product Description
20" Orbital Walk-Behind Auto Scrubber | AGM Battery | Karcher B 50 W Bp O51 SKU 9.808-091.0
The Karcher B 50 W Bp is a compact walk-behind automatic floor scrubber built for fast, efficient wet cleaning of commercial floors and hard surfaces. With its slim design and smart features, the B 50 W Bp is a strong fit for schools, retail stores, healthcare facilities, and municipal buildings where maneuverability and consistent daily performance matter.
This configuration uses the O51 orbital scrub head with a 20 inch cleaning path and strong mechanical cleaning performance. Orbital cleaning can reduce water usage (up to 25 percent vs traditional disc heads) and can be used for both scrubbing and stripping tasks when paired with the correct pads. The B 50 platform also features durable die-cast aluminum scrub head and squeegee assemblies, a parabolic squeegee for strong water recovery, and traction drive to reduce operator fatigue.
20 in cleaning path | 13.2 gal tanks | Traction drive | On-board charger | Orbital scrub head | Parabolic squeegee for excellent recovery
Choosing the Right Scrub Head
- O51 Orbital (this model) - Best for aggressive cleaning, low-water performance, and stripping capability with the correct pads.
- R55 Cylindrical - Ideal for textured floors and facilities where light debris pickup is helpful (pre-sweep effect).
Looking for the cylindrical version?
View the Karcher B 50 W Bp R55 AGM Cylindrical Scrubber (SKU 9.176-020.0)
Want longer runtime and faster charging with lithium power?
Upgrade to the Karcher B 50 W Bp O51 Li-Ion version (SKU 1.533-272.0)
Free Demo Available
Want to see the B 50 W Bp in action before you buy? We can help schedule a free demo when available. Email sales@monsterjanitorial.com with your facility details, flooring type and approximate square footage to confirm availability and recommendations.
Recommended Applications
- Schools and university facilities
- Retail stores and supermarkets
- Healthcare and municipal buildings
- Commercial offices and public facilities
- Tile, VCT, concrete, and resilient flooring
Specifications
- Manufacturer Part Number: 9.808-091.0
- Cleaning Width: 20.07 in
- Brush Type: Orbital pad head (O51)
- Squeegee Width: 33.4 in
- Drive Type: Traction drive
- Solution / Recovery Tank: 13.2 gal / 13.2 gal
- Theoretical Productivity: up to 32,937 sq ft/hr
- Practical Productivity: approx. 19,805 sq ft/hr
- Brush Contact Pressure: 79.3 lb
- Brush Speed: 20 rpm
- Driving Speed: up to 3.7 mph
- Battery Type: AGM (low maintenance)
- Operating Noise: approx. 65 dB(A)
- Weight (with batteries): approx. 540 lb
- Dimensions (L x W x H): 52 x 22.5 x 42 in
Included with this configuration
- 4.778-008.0 - Squeegee bar, parabolic, 850 mm / 33 in
- 4.400-011.0 - Squeegee blade set Linatex 850 mm / 33 in (standard)
- O51 orbital scrub head (included)
- 8.632-375.0 - AGM battery (included with AGM models)
- On-board charger (included)
- Die-cast aluminum suction bar and scrub head assemblies
Optional / Not Included
- 4.035-345.0 - Auto-Fill
- 2.644-365.0 - Add-on kit emergency stop B 50 W
- 4.400-089.0 - Set side strip oil resistant
- 4.400-090.0 - Squeegee blade set natural rubber 850 mm / 33 in
- 5.035-488.0 - Home Base kit (adapter and cable hook)
- 4.070-075.0 - Home-Base universal hook kit (requires 5.035-488.0)
- 4.400-080.0 - Home-Base mop clip (requires 5.035-488.0)
- 6.980-077.0 - Home-Base double hook (requires 5.035-488.0)
- 6.980-078.0 - Home-Base holder handhold grey (requires 5.035-488.0)
- 2.644-313.0 - KEM Machine Connect B 50 W (not included for this model)
Orbital Pad and Brush Options (O51)
- 6.369-077.0 - Black pad 508 mm (kit 5 pcs)
- 6.369-078.0 - Green pad 508 mm
- 6.369-079.0 - Red pad 508 mm (kit 5 pcs)
- 6.370-273.0 - Disc brush for O51
- 6.371-030.0 - Pad SPP 51
- 6.371-271.0 - Microfiber pad
Replacement Squeegee Options
- 4.400-011.0 - Squeegee blade set Linatex 850 mm / 33 in (standard)
- 4.400-005.0 - Squeegee blade set PU 850 mm / 33 in
- 4.400-090.0 - Squeegee blade set natural rubber 850 mm / 33 in
Recommended Chemicals
- Pioneer Eclipse Lumen L350 Neutral Cleaner
- Pioneer Eclipse Low-Foam Neutral Cleaner
- Karcher Heavy Duty Degreaser 8.698-154.0
Shop Cleaning Chemical Pods | Shop Auto Scrubber Chemicals
Replacement Parts and Manuals
Need parts diagrams, wear items, or service parts? Visit our Karcher manuals hub:
Manuals and Documents
- Operating manual / Safety information
- Operating manual / Safety information
- Operating manual / Safety information
- Product Information Sheet
Frequently Asked Questions
What does "orbital" mean on a floor scrubber?
An orbital scrubber head moves the cleaning pad in a rapid oscillating motion instead of spinning like a traditional disc scrubber. This motion creates higher mechanical agitation, allowing the machine to clean more aggressively while using less water and fewer chemicals.
Why is the Karcher O51 orbital head round instead of rectangular?
Orbital refers to the cleaning motion, not the shape of the scrub head. While many orbital floor machines use rectangular pads, the Karcher O51 uses a round 20 inch pad that moves in an orbital pattern to deliver strong cleaning performance with improved maneuverability.
Can an orbital scrubber strip floors?
Yes. Orbital scrubbers can often remove floor finish using only water or reduced chemical usage when paired with the correct stripping pads, making them a more sustainable option compared to traditional disc machines.
What types of floors are best for an orbital scrubber?
Orbital scrubbers work well on VCT, tile, concrete, terrazzo, and other hard floors where stronger mechanical agitation is helpful for deep cleaning or finish removal.
Manufacturer Warranty
Limited Warranty - Karcher North America
- Lifetime Parts Coverage - Parts and components covered for the lifetime of the machine to the original purchaser.
- Lifetime Polyethylene (PE) Housings - Rotationally molded PE housings covered for the lifetime of the machine.
- 3 Years Labor - Service labor covered for three (3) years through authorized service providers.
- Travel Coverage - Up to three (3) hours round-trip travel for field repairs during coverage period.
- AGM Batteries - Warranty handled by battery manufacturer.
- Wear Items - 90 days against manufacturing defects.
View Full Karcher Lifetime Warranty PDF
Helpful Resources for Facility Managers
- How to Choose an Automatic Floor Scrubber for Schools and Government Buildings
- Lithium vs AGM vs Wet Batteries in Automatic Floor Scrubbers
- Karcher Automatic Floor Scrubber Maintenance Checklist
Institutional Purchasing Support
- Purchase orders accepted
- Tax-exempt account setup assistance
- Bid and specification support available
- D-U-N-S Number: 080901706
- UEI Number: U4TYL7A5LEN9
Why Choose Monster Janitorial?
- Authorized Karcher distributor
- OEM equipment, parts and accessories
- Fast order processing - most in-stock items ship within 24 hours
- 30-Day Returns
Tax-Exempt Purchasing
Tax-exempt? Create an account and email your certificate to sales@monsterjanitorial.com.
Questions before you buy? Email sales@monsterjanitorial.com or call 956-772-4842.
