The HP series power packs feature high operational reliability and long service life. All components are mounted on top of the oil tank for easy access.
The self-priming radial-piston pump is driven by an asynchronous motor. The nine pistons are in hydrostatically balanced contact with the stroke ring. Flow rate is regulated by the stroke-ring eccentricity, which is adjusted via two control pistons located opposite each other. The pressurized oil is routed via a high-pressure filter and is then available to the appliance. A factory-set pressure relief valve prevents excessive increases in pressure.