708-2L-00950 708-2L-00951 708-2L-00930 708-4L-00930 Main Hydraulic Pump Assembly Or Steering Work Pump Assembly For Komatsu WA800-3 WA900-3

Main Hydraulic Pump Assembly or Steering Work Pump Assembly, suitable for Komatsu models such as WA800-3 and WA900-3.

• Insufficient system pressure, weak lifting and bucket curling
• Abnormal noise and heavy vibration of hydraulic pump, cavitation sound
• Excessive internal pump leakage, rapid oil temperature rise
• Damaged pump shaft seal, external oil leakage on pump
• Stuck displacement control mechanism, abnormal flow regulation
• Worn pistons and cylinder block, reduced volumetric efficiency
• Scuffed valve plate, severe pressure fluctuation
• Air ingestion in suction line, foamy hydraulic oil
• Worn servo valve, slow displacement response
• Damaged bearing, knocking noise during pump operation

Perform case drain flow test first to assess wear condition. Replace complete hydraulic pump assembly if pistons, cylinder block or valve plate are severely scuffed. Purchase piston kit and repair kit for rebuilding in case of minor wear.

Verify OEM part number strictly before purchase. Check pump housing for cracks, sand holes and deformed flange surface. Select high-quality seal kit to prevent premature shaft seal failure. Check condition of displacement control valve and servo valve, purchase separately if required.