Hitachi ZX330 Swing Motor Assembly M5X180CHB

This high-precision rotary motor assembly component adopts Kawasaki M5X180CHB/M5X180 core pump type, with Hitachi corresponding core original part number 4419718. This assembly is specially designed for Hitachi's core medium to large excavators, perfectly matching 33 ton main models such as ZX330, ZAX330, and classic EX330-3. The product is based on first principles for high-pressure fluid dynamics optimization, ensuring absolute certainty of high-frequency rotation and precise braking of the upper body. The physical dimensions of the product packaging are approximately 540mm × 410mm × 430mm, with an overall net weight of approximately 95kg. The original factory standard position seamlessly connects.

"Extreme cleaning and alignment: Noise reduction and dust removal treatment are required for the unpacking and installation environment. Before installation, the mating surface of the rotary reducer must be thoroughly cleaned to ensure precise and stress free meshing of the output gear. Tighten the bolts using a torque wrench strictly according to the specified torque for symmetrical cross tightening.

Forced oil injection (core avoidance pit): Do not connect the case drain pipe incorrectly when connecting the high-pressure oil pipe. Before starting the engine, clean hydraulic oil must be filled from the oil inlet at the top of the rotary motor housing. It is strictly prohibited to start dry grinding, otherwise the internal rotating components will undergo physical erosion within 3 seconds of ignition.

No load micro motion transition: After the first ignition, control the upper body to perform a slow rotation micro motion at a small angle left and right for 10-15 minutes in an unloaded state. After clearing the circuit air and confirming the thermodynamic stability, gradually apply the working load."