Hitachi ZX330-3G and ZX350 M5X180CHB Electronic Injection Swing Motor Optimize the superstructure rotational performance and precise alignment control of your heavy-duty crawler fleet with premium-grade replacement swing motor assemblies engineered specifically for Hitachi Zaxis medium and large excavator series. Designed to handle intense torsional shock loads during repetitive 360-degree slewing in high-volume mass excavation, quarry processing, and heavy earthmoving, these electronic injection matching units guarantee continuous torque transmission and reliable field durability. Applicable Excavator Models and Specifications Compatible Excavators: Hitachi Zaxis ZX330-3G, ZX330LC-3G, ZX350LC, ZX350H, ZX350LC-3G, ZX350H-3G, ZX360H-3G, ZX330-3, ZX350-3, ZX330-5A Associated Engine Models: Isuzu 6HK1, Isuzu 6HK1X Common Rail Electronic Injection Diesel Engines Hitachi 330G & 350G Series Hydraulic Swing Motor Group The high-pressure axial piston swing motor acts as the foundational core for managing the upper cabin turntable’s rotational inertia. Configured for electronic injection machinery, the unit integrates smoothly with advanced onboard pilot controls and high-pressure swashplate distribution networks to maximize volumetric efficiency while eliminating structural drift. Part Numbers & Interchangeable Production Codes Primary Motor Assembly Part Number: 4419718 Interchangeable Production Codes: 4616985, 4419718M, 4616985R, 60100458-J Engineering Model Reference: M5X180CHB-10A-01C/320, M5X180CHB-10A-01D330, M5X180CHB-10A-64C-330 Associated Slewing Mechanism Reference: 9204194 Swing Device Casing Group Planetary Reduction Gearbox & Internal Maintenance Spares To support systematic high-wear fleet maintenance schedules and reduce field down periods during workshop overhauls, a full range of high-tolerance internal repair parts and complete sealing groups is available. Related Service and Repair Elements Rotary Group Parts: 816201 Piston Assemblies, cylinder blocks, valve plates, shoe retainers, and ball guides Slewing Reduction Gears: Output drive pinion shafts, central sun shafts, and multi-stage planetary carrier blocks Dynamic Sealing Systems: 353318 High-pressure shaft oil seals, durable casing roller bearings, and full 4419718 Swing Motor Seal Kits Key Technical Advantages Electronic Injection Proportional Response: Configured to sync instantly with electronic hydraulic control systems, providing smoother acceleration and high-precision swing stopping metrics. Integrated Pressure Relief Protection: Built-in dynamic cushion and crossover relief valves dampen intense hydraulic pressure spikes during immediate stopping actions, shielding the primary slewing ring teeth from micro-fractures. Induction-Hardened Gearing Metallurgy: Critical internal sliding surfaces and planetary gear profiles undergo specialized heat treatment to resist wear from particulate-heavy lubricants under high thermal conditions. Direct Drop-In Structural Alignment: Machined precisely to match original factory bolt-hole boundaries and output spline structures, enabling an immediate drop-in field installation with no custom retrofitting required. Related Part Numbers NO P.N. 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