Hydrostatic drive system of mobile working machine e.g. industrial truck, has fan drive that is controlled by directional control valve having pressure balance

摘要

The drive system (1) has several loads (25-29), comprehensive working hydraulics (4) and/or a hydraulic steering unit (5) that are in connection with a combustion engine (3). A hydraulic fan drive (6) is provided for generating cooling air flow for heat exchanger (12). The fan drive is supplied with pressure medium by the load-sensing pump (2). The fan drive is controlled by directional control valve (DW) connected with pressure balance unit (WV).