Product Overview This hydraulic main piston pump is the core power component of the excavator hydraulic system, compatible with the E336D and 340D models. It supplies pressure oil for boom, arm, bucket, and travel movements. Manufactured with precise machining, it delivers stable output pressure and excellent wear resistance, making it an ideal choice for machine overhaul and replacement. Compatible Models E336D, 340D Excavator Interchange Part Numbers 434-8188, 322-8733