Excavator Hydraulic Main Piston Pump 397-3680 387-2626 436-6669 for E320D2 E321D2 E323D2

This hydraulic main piston pump is the core power component of the excavator hydraulic system, compatible with the E320D2, E321D2, and E323D2 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.

The following symptoms typically indicate that the hydraulic main piston pump requires inspection or 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 the hydraulic oil clean during installation
• Replace the sealing kit together if necessary