Product Overview This hydraulic main piston pump is the core power component of the excavator hydraulic system, compatible with E330B and E345B machines. 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: 126-2146311-9544 Common Faults Weak digging force and slow