Excavator Hydraulic Pump 708-1G-00014 708-1G-00015 708-1G-11510 Komatsu PW160-7 PW160-8 Main Piston Pump Pressure Pump Common Faults & Symptoms Slow machine movement, weak digging power: Performance worsens when hot due to wear of internal plungers, slippers, and valve plate causing increased internal leakage and excessive case drain flow. Engine lugging and speed drop under load: Caused by stuck power control spool or faulty servo piston preventing normal displacement