90R055 hydraulic piston pump is variable displacement axial piston pump for hydrostatic closed circuit systems. New genuine 90R055 hydraulic piston pump is Sauer Danfoss pump with full factory warranty. Series 90 hydrostatic pumps and motors can be applied together or combined with other products in a system to transfer and control hydraulic power. 90R055 hydraulic piston pump is intended for closed circuit applications.