Part Numbers: 708-2L-00300, 708-2L-01301, 708-2L-01201, 708-2L-00112
HPV95 twin axial variable displacement main piston pump. Front and rear pumps are integrated in one housing and directly driven by engine flywheel. It adopts Komatsu OLSS Open Center Load Sensing System with single EPC proportional solenoid valve.
Key Features
HPV95 twin axial variable displacement design
Integrated front and rear pumps in single housing
Direct drive from engine flywheel
Komatsu OLSS Open Center Load Sensing System
Single EPC proportional solenoid valve
Common Faults & Solutions
1. Weak Operation When Hot
Wear of pistons and valve plate reduces volumetric efficiency and causes high-pressure internal leakage. Hydraulic oil contamination is the main cause.
2. Engine Lugging & Speed Drop
Stuck or misadjusted PC power valve; EPC solenoid malfunction, pump absorbed power exceeds engine output.
3. Slow Whole Machine Movement
Damaged coil or clogged spool of EPC solenoid valve; stuck LS valve spool; worn internal pump parts.
4. Abnormal Noise & Vibration
Blocked suction filter, air entering suction pipe causing cavitation; damaged bearing or piston & shoe.
5. Large Case Drain Flow
Internal wear causes high-pressure oil internal leakage out of pump case drain port.