Excavator Hydraulic Pump Komatsu PC400-6 PC450-6 PC300-6 PC350-6 708-2G-00191 708-2H-00350 708-2H-00130 Main Piston Pump Product Overview Komatsu PC400-6 Hydraulic Main Piston Pump - A robust, fully mechanical control system designed for heavy-duty mining and earthmoving operations with high reliability and automatic displacement adjustment. Technical Specifications Model HPV132 Twin Variable Displacement Piston Pump Part Numbers 708-2H-00191, 708-2H-00350, 708-2H-00120, 708