Bulldozer Komatsu D65PX-12 D65EX-12 D85-12 Hydraulic Pump Main Pump Piston Pump 708-1L-00011 708-1L-00012 708-1L-01011 Product Overview The main pump of the D65 (D65EX / D65PX / D65WX series) serves as the power source for the entire hydraulic system. This axial variable displacement piston pump converts engine power into high-pressure oil, supplying the blade lift/tilt/tip, ripper, and steering functions. On the Komatsu D65 platform, the main pump is typically a piston pump