The Huade HD-A4VSO180DR/30R-PPB13N00 / HD-VSO40DR is a high-performance tandem axial piston variable pump engineered by the Beijing Huade Hydraulic Group. This robust combination unit integrates a heavy-duty HD-A4VSO180 main pump with a reliable HD-VSO40 secondary pump, offering exceptional versatility and power density. Equipped with a DR (pressure control) mechanism on both units, it ensures precise, stable, and efficient fluid delivery under varying load conditions. Designed with a clockwise (R) rotation, this tandem hydraulic pump is the ideal solution for demanding applications in construction machinery, industrial manufacturing, and heavy-duty hydraulic systems requiring continuous and dependable operation.