Hydra-Grinder 21 Propane Grinder, Polisher and Burnisher

The 420GPHD is the answer to hard floor maintenance. This propane powered floor care machines grinds, polishes, and burnishes hard floor surfaces such as concrete, marble, and terrazzo. Variable speed control (1000-1500 rpm), on board water supply, and a variety of diamond pads create an effective, efficient, and versatile system for professional building service contractors.

Powered by an 18-HP, 603 cc Kawasaki engine, the 420GPHD uses 34 percent less fuel and require 40 percent fewer oil changes than other machines in its class.

The 420GPHD comes equipped with a weight bracket for maximum head pressure as well as a dust port to accommodate a vacuum hose for dry grinding. It comes standard with a heavy-duty diamond driver for traditional 3 inch, (83 mm) diamonds. The 420GPHD comes standard with SafeStop to ensure propane safety and SAFR™ Technology to keep CO levels low even with a dirty air filter.

  • Internal “above pad” water dosing system provides for even floor wetting and prevents wetting walls and merchandise.
  • Adjustable welded handle for improved comfort and control.
  • Eco-Sense™ emissions monitoring system.
  • American made all aluminum casting.
  • RokBak™ de ck for easy diamond and pad installation.
  • Easy access fi lters for quick maintenance.
  • Ergonomic clutch and finger tip on/off water flow control.
  • Integral skirt protects surrounding merchandise.
  • Heavy duty diamond driver accommodates 3” Diamonds. (HD only) Weight bracket for maximum head pressure.
  • Dust port to accommodate vacuum hose for dry grinding.
  • 2 12-volt on-board battery starter.
  • 3 7 gallon (26.5 liter) on board water supply.
Quote Request



Product Info Sheet

Hydra-Grinder 21