Product Overview 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. Interchange Part Numbers 397-3680, 387-2626, 436-6669 Compatible Machine