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The Doosan DXB170H hydraulic breaker features nitrogen gas-assisted operation for improved efficiency in demanding demolition and rock-breaking applications. The 3,572-pound DXB170H delivers up to 600 blows per minute and is designed for use with excavators in the popular 18- to 28-metric-ton weight range. Rated in the 5,000 ft.-lb. impact energy class, the DXB170H requires a hydraulic flow rate of between 26.5 and 39.5 gallons per minute. Tight tolerances in the manufacture of pistons and cylinders on the DXB170H eliminate leaks and jamming and guarantee full interchangeability of replacement parts. In addition, a patented hydraulic dampening system extends the life of the breaker by preventing blank fire damage from the very first blow.