Hitachi ZAX330 ZAX350-3 ZAX350-3G Excavator Swing Motor Assembly Slewing Motor 4616985 Complete Hydraulic Swing Device Aftermarket
Welcome to our heavy machinery hydraulic supply center. We specialize in providing the complete ZAX330 / ZAX350-3 / ZAX350-3G excavator swing motor assembly (Part No. 4616985 / 4419718 / M5X180CHB), precision-manufactured as a heavy-duty aftermarket replacement part compatible with Hitachi large engineering machinery equipment. Built to deliver original slewing torque and high hydraulic pressure stability, this complete swing device ensures maximum efficiency under tough mining and construction environments.
- Product Name: Swing Motor Assembly / Slewing Motor Device / Swing Reduction Gearbox
- Applicable Machine Models: Fit for Hitachi ZAX330, ZAX330-3, ZAX350-3, ZAX350-3G, ZX350LC-3, ZX360H-3 Excavators
- Reference Part Number / Motor Code: 4616985 / 4419718 / 9236592 / M5X180CHB
- Key Internal Components: High-displacement swashplate piston motor, swing relief valve, heavy-duty planetary gear reduction set
- Condition: 100% Brand New Aftermarket / Direct OEM Fit Replacement
- Warranty & Quality Control: 100% Factory Hydraulic Pressure Tested, 6–12 months warranty included
Heavy slewing loads in 30+ ton excavators often lead to internal wear. Replacing your worn device with our complete ZAX330 / ZAX350-3 swing motor assembly directly solves these major operational issues:
Cause: Internal pressure leakage from worn cylinder block/pistons or degraded relief valve springs.
Fix: Installing our complete unit restores original 360-degree turning force and fast cycle times under full bucket loads.
Cause: Chipped planetary gear teeth, damaged pinion shaft splines, or worn bearings.
Fix: Full assembly replacement eliminates mechanical chatter and gear grinding, protecting the main slewing ring gear.
Cause: Aged or blown shaft oil seals caused by prolonged high system pressure.
Fix: Japanese high-pressure oil seals are built-in to prevent oil contamination and maintain fluid integrity.
Cause: Hydraulic oil contamination or sticking brake valve spools during turning.
Fix: Precision-machined spool clearances ensure smooth start/stop rotation without sudden hydraulic shocks.
Cause: Excessive internal friction from worn gears or insufficient gear oil circulation.
Fix: Optimized oil passage design and heat-treated alloy gears keep operating temperatures safe during long shifts.
Designed for heavy-duty 35-ton class excavator demands, this swing motor assembly suitable for Hitachi ZAX330 / ZAX350-3 / ZAX350-3G excels in:
- Heavy Mining & Quarry Operations: High torque output supports continuous rapid swing cycles with heavy rock buckets.
- Large Earthmoving & Infrastructure Work: Smooth braking control allows exact digging and dumping placement.
- Rock Breaking & Demolition: Reinforced steel housing withstands severe dynamic impacts and vibration.
Q: Where can I buy a replacement swing motor assembly compatible with Hitachi ZAX330, ZAX350-3, or ZAX350-3G?
A: You can purchase complete aftermarket ZAX330 and ZAX350-3/3G swing motor assemblies directly from us. We stock brand-new, factory-tested complete units ready for fast worldwide shipping.
Q: What are the OEM part numbers for the ZAX350-3 / ZAX350-3G swing motor?
A: Common reference part numbers include 4616985, 4419718, 9236592, and motor code M5X180CHB. Please confirm your machine nameplate or contact us for verification.
Q: Is this ZAX330 swing motor a direct bolt-on replacement?
A: Yes, it is built to exact OEM mounting dimensions, hydraulic line port threads, and output spline shaft counts for direct drop-in installation.
