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General Overview

The Onyx JX 21" Burnisher is a propane-powered machine built for maximum speed, safety, and efficiency. Capable of polishing up to 35,000 square feet per hour, it is ideal for maintaining vinyl tile, terrazzo, and polished concrete floors. A patented floating shroud ensures superior dust control, creating a cleaner and safer work environment.

Driven by a 708cc 19hp LPG engine featuring a patented variable jet fuel system, this burnisher reduces emissions by up to 53% compared to similar models in its class. With its durable frame, quiet operation, and versatile design, itโ€™s a reliable choice for airports, schools, grocery stores, and retail spaces.


Included in Your Package

  • Onyx 21" JX Burnisher w/ 708cc Engine

  • Floating Dust Containment Shroud

  • 21" Pad Driver

  • 20lb Steel Fuel Tank with Overfill Protection Device


Key Features

High-Performance Engine
708cc 19hp EPA-certified LPG engine ensures powerful and efficient operation.

Exceptional Productivity
Burnishes up to 35,000 sq. ft. per hour, increasing efficiency in large spaces.

Effective Dust Control
Patented floating shroud with 2.5" vacuum port minimizes airborne particles.

Low-Noise Operation
Operates under 87 dBA with anti-vibration isolators to enhance operator comfort.

Versatile Pad Support
3-in-1 configuration designed for 21" pads with adjustable speeds from 1,200โ€“2,100 RPM.

Eco-Friendly Design
Reduces emissions by 53% compared to other propane engines, supporting near-zero emission standards.

Heavy-Duty Construction
Powder-coated reinforced steel frame ensures lasting durability.

Extended Runtime
Runs for up to 6 hours on a single 20lb LPG cylinder, minimizing downtime.


Specifications

Product Function Floor Burnishing
Operation Mode Walk-Behind Pad Assist
Power LX700 20hp Propane Engine
Performance 34,000 SqFt per hour
Working Width 21"
Run Time 6 Hours Per 20lb Propane Cylinder
Pad / Brush Size 21"
Weight 290 lbs
Pad Speed 1200-2100 RPM
Dimensions 21"W x 53"L x 48"H
Clutch Optional
Emission Monitoring System Optional
SAM Safe Air Monitor Optional
Headlight Optional
Muffler Heat Shield Optional

Product Documents

JX-700ย Data Sheet

Product specification and additional features. ย 

Operator Manual

Full operation, maintenance, and safety guide.

Illustrated Parts List

Complete parts list and ordering information.

Wiring Diagram

Complete electrical wiring diagram for troubleshooting.

Product Videos

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Troubleshooting a Machine That Does Not Crank

Learn how to diagnose and repair an engine that does not start.

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Troubleshooting a Machine that Starts but Dies

Learn how to diagnose and repair an engine that starts, but quickly dies when the key is in the RUN position.

Manufacturer Warranty

All Onyx products purchased through Centra Supply carry Onyxโ€™s standard manufacturer warranty. Onyx units carry a 3/3/3/3 warranty โ€” 3 years on parts, labor, motor, and the rotationally-molded body. Coverage varies by product line โ€” contact us for the exact terms on this model.

To Claim: Email support@centrasupply.com with your order number, product model, and a description of the issue. Photos or video of the defect may be requested. Most claims are acknowledged the same business day.

Centra Supply is an authorized Onyx dealer โ€” your warranty is fully valid and manufacturer-backed.