Excavator Hydraulic Pump 708-3T-00161 708-3T-01161 708-3T-042500 Komatsu PC70-8 PC60-8 Main Piston Pump Product Overview High-performance main piston hydraulic pump designed for Komatsu PC70-8 and PC60-8 excavators. Compatible with part numbers 708-3T-00161, 708-3T-01161, and 708-3T-042500. Common Operational Faults Weak digging power when hot: Internal leakage from worn pistons, cylinder block, and valve plate Engine lugging: Stuck PC valve or malfunction of EPC solenoid