ZX330-3G or ZX350 pulling hard to one side or final drive overheating under normal load? A worn 9281921 final drive assembly loses both motor efficiency and gearbox reduction accuracy on this 30-35 tonne Hitachi. RITO supplies this complete large-format final drive to restore full ZX330-3G tractive force and bilateral travel stability.
Item NO.:
9281921Order(MOQ):
1pcsPayment:
T/T, WESTERN UNION, CHINESE BANK,PAYPALProduct Origin:
JAPANShipping Port:
Huangpu,GuangzhouLead Time：
In Stock9281921 Final Drive Assembly for Hitachi ZX330-3G, ZX330, ZX350 and ZX360 excavators. Large-format complete travel drive unit integrating the high-pressure axial piston travel motor with the multi-stage planetary final drive gearbox for 30-35 tonne class machines.
| Part Number | 9281921 |
|---|---|
| Part Name | Final Drive Assembly (Travel Motor + Gearbox) |
| Compatible Brand | Hitachi |
| Applicable Models | ZX330-3G, ZX330, ZX350, ZX360 Excavator |
| Application | Complete final drive travel assembly for Hitachi ZX330-series track propulsion |
| Material | Alloy steel rotating group and gears, heavy-duty cast housing |
| Product Color | Industrial finish |
| Working Temperature | -30°C~+80°C |
| Key Function | Provides ZX330-series travel drive for track propulsion and slope operation on 30-35 tonne machines |
| Condition | 100% New Aftermarket OEM Quality |
| Packaging | Wooden Case Reinforced Carton Neutral Packing Customized Box |
Motor displacement and gearbox reduction ratio selected for ZX330-class tractive torque requirements during slope climbing and hard-ground engagement at operating weight.
Three-stage planetary reduction with case-hardened gear elements provides the high reduction ratio for ZX330 working track speed under full tractive load.
Separate motor case-drain and gearbox gear-oil circuits sealed from each other, preventing hydraulic oil contamination of gear oil that accelerates gear wear.
9281921 covers ZX330-3G, ZX330, ZX350 and ZX360 for direct bolt-on replacement across Hitachi ZX330-series final drive housings.
FAQ
Q: How to diagnose motor versus gearbox failure in 9281921?
A: Test motor case-drain flow at rated travel pressure. Above OEM spec (typically 10-15 L/min for this class) confirms motor wear. Normal drain with gear noise confirms gearbox failure.
Q: What gearbox oil grade should I use after fitting 9281921 on ZX330-3G?
A: Use EP 140 gear oil per Hitachi ZX330 service manual. Fill to correct level and change after first 50-hour break-in period.
Q: Is 9281921 the same assembly for ZX330 and ZX330-3G?
A: 9281921 covers ZX330 and ZX330-3G in most configurations. Confirm hydraulic port sizes and motor flange bolt pattern for your specific serial number range with our team.
Q: How to confirm 9281921 is correct for my ZX330-3G?
A: Match part number 9281921 and confirm machine is ZX330-3G, ZX330, ZX350 or ZX360. Provide machine serial number for cross-reference.
Q: What quality options are available?
A: We provide original, OEM and high-quality aftermarket versions with stable supply capability.
Q:Why Choose RITO?
A:Listed Factory
Stable&Reliable Quality
OEM Factory for Chinese Top Excavator Brands
Supplier to Fortune 500 Companies
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