Hydraulic Main Piston Pump 311-7404 173-0663 for E312D 313D 314D Excavator

This hydraulic main piston pump is the core power component of the excavator hydraulic system, compatible with E312D, 313D, and 314D models. It supplies pressure oil for boom, arm, bucket, and travel movements. Manufactured with precise processing, it delivers stable output pressure and excellent wear resistance, making it an ideal choice for machine overhaul and replacement.

• Weak digging force and slow working speed
• Abnormal noise and vibration from the pump during operation
• Internal wear leading to pressure drop
• Oil leakage at the pump assembly sealing surface
• Unstable hydraulic flow and action jitter

• Verify the machine model before placing your order
• Confirm the part number matches your old pump
• Keep hydraulic oil clean during installation
• Replace the sealing kit together if necessary