Product Overview This hydraulic main piston pump is the core power component of the excavator hydraulic system, compatible with the E320B V1 and E320B V2 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. Interchange Part Number: 114-0490 Common Faults Weak digging force and slow