Excavator Hydraulic Pump Komatsu PC200-6 PC210-6 PC240-6 PC270-6 Product Overview Part Numbers: 708-2L-00423, 708-2L-00421, 708-2L-00461 HPV95 twin axial variable displacement main piston pump. Front and rear pumps integrated in one housing, directly driven by engine flywheel. It adopts Komatsu OLSS (Open Center Load Sensing System) with fully mechanical hydraulic regulation - No EPC solenoid valve. Common Faults & Solutions Weak operation when hot, acceptable performance