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Allied Construction Products’ Hy-Ram HR Series hydraulic impact hammer has an oil and gas operation that increases efficiency, a longer piston stroke for higher impact power and an auto-stop system to prevent “blank firing.” The Allied design of gas-assist using low pressure nitrogen improves the efficiency by reducing demand on the carrier’s hydraulic system. There is no dependency on hydraulic accumulators. The accumulators are merely used to eliminate hydraulic “spikes”. And, pressurized oil is always present at the bottom of the piston which prevents internal cavitation. Another feature that contributes to the reliability of the Allied Hy-Ram is the long-stroke design which minimizes recoil, reduces vibration and eliminates mechanical springs.