Excavator Hydraulic Pump 708-1S-00260, 708-1S-00270, 708-1S-00254 Komatsu PC30MR-2 / PC27MR-2 Main Piston Pump Pressure Pump The PC30MR-2 is a Komatsu mini crawler excavator . The hydraulic main pump is a main variable displacement piston pump . Common part numbers on the same platform: 708-1S-00260 / 708-1S-00270 / 708-1S-00254 (common to PC30MR-2 / PC27MR-2), plus a separate pilot gear pump. Common Faults Weak movement / slow operation: Internal leakage from worn main pump