Developed and designed for tough digging conditions, the Hydra PHD™ is powered by a high-pressure, high-efficiency motor, which is isolated from all side and end thrust by two heavy self-aligning, greasable, sealed ball bearings. Instant reversibility and hydraulic cushioning by the system relief valve make operation fast and fool-proof in nearly any digging condition. Shear-pin breakage is virtually eliminated because all over-load and shock conditions are absorbed by the truck, tractor or skidloader's open or closed center hydraulic system.