For R375, R380, and R390 excavators operating in mining, quarrying, and heavy construction environments, a reliable swing gearbox is essential for maintaining smooth upper structure rotation, powerful torque output, and stable machine productivity. Large excavators require a durable planetary reduction system capable of handling continuous swing operations, high hydraulic loads, and harsh working conditions. RITO 31NA-10150 R375 R380 R390 Excavator Swing Gearbox Hydraulic Swing Drive Planetary Reduction Unit Assembly provides efficient hydraulic power transmission, stable torque conversion, and dependable slewing performance for Hyundai excavator applications. The 31NA-10150 swing reduction gearbox is commonly associated with Hyundai R375-7, R380-9, R385-9, and related heavy excavator swing drive systems.
Item NO.:
31NA-10150Order(MOQ):
1pcsPayment:
T/T, WESTERN UNION, CHINESE BANK, PAYPALProduct Origin:
JAPANShipping Port:
Huangpu,GuangzhouLead Time：
In StockDesigned for professional excavator repair and replacement supply, this hydraulic swing drive reducer assembly delivers consistent rotary power transfer and reliable compatibility for Hyundai heavy equipment fleets. It is an OEM-equivalent replacement solution for equipment distributors, maintenance workshops, and fleet operators who require durable swing components to reduce downtime, restore slewing efficiency, and maintain stable operation during continuous heavy-load cycles. The planetary reduction structure helps convert hydraulic motor power into controlled rotary movement while increasing output torque for smoother excavator rotation. The 31NA-10150 assembly includes key transmission components such as carriers, planetary gears, shafts, and reduction gear elements for reliable swing operation.
| Part Number | 31NA‑10150 / 31NA‑10150 |
|---|---|
| Part Name | R375 R380 R390 Excavator Swing Gearbox Hydraulic Swing Drive Planetary Reduction Unit Assembly |
| Compatible Brand | HYUNDAI |
| Applicable Models | R375, R380, R390 Heavy-Duty Construction Excavator |
| Application | Hydraulic drive system for excavator upper body slewing; widely applied in municipal engineering, highway construction, quarry excavation and bulk material stacking work |
| Material | High‑strength forged alloy steel + heavy‑load wear‑resistant bronze friction parts |
| Product Color | Matte anti‑rust industrial metallic gray |
| Working Temperature | -22℃ ~ +58℃ |
| Key Function | Convert hydraulic pressure into stable slewing torque to drive upper carriage rotation for infrastructure and earthmoving projects |
| Condition | 100% New, Aftermarket / OEM Equivalent Quality |
| Packaging | Wooden Case/Reinforced Carton/Neutral Packing / Customized Box |
Provides strong rotary force and smooth speed reduction for R375, R380, and R390 excavator upper structure rotation.
Converts hydraulic motor power through the reducer system to achieve smooth and controlled slewing movement.
Built with high-strength internal gears, carriers, shafts, and transmission components to withstand vibration, impact loads, and long operating cycles in demanding jobsite environments.
Matches 31NA-10150 specifications for Hyundai R375, R380, and R390 excavator hydraulic swing drive systems.
FAQ
Q: What problems can indicate a worn 31NA-10150 swing gearbox?
A: Slow swing speed, reduced rotation force, abnormal gearbox noise, vibration, and unstable upper structure movement may indicate internal component wear.
Q: How does the 31NA-10150 planetary reduction unit improve excavator performance?
A: It reduces hydraulic motor speed while increasing torque output, helping large excavators achieve smoother and more powerful swing operation.
Q: What information should buyers confirm before ordering a Hyundai swing gearbox?
A: Customers should verify the excavator model, original part number, gearbox structure, mounting specifications, and operating environment to ensure correct compatibility.
Q: Why choose a complete swing reduction assembly for heavy excavator maintenance?
A: A complete unit simplifies installation, reduces repair time, and helps restore reliable swing system performance with improved replacement efficiency.
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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