Hydraulic drive system useful for driving construction machinery

摘要

The hydraulic drive circuit (26) contains filters (5, 5') fitted with two support cages dimensioned to produce identical or differential pressure at both sides. The hydraulic drive system has a hydraulic circuit (26) containing a motor-driven two-directional pump (1) connected by respective feed and return lines (2, 2') to filters (5, 5'). Each filter is connected to a respective feed and return line (27, 28) of a hydraulic motor (3) and contains two support cages dimensioned to produce an identical pressure or a differential pressure at both sides.