For R300LC-9, R300, and R305 excavators operating in construction, quarrying, and heavy earthmoving environments, a reliable swing gearbox assembly is essential for maintaining smooth upper structure rotation, strong torque output, and stable machine productivity. Heavy-duty excavation requires a durable rotary reduction system capable of handling continuous swing cycles, high loads, and demanding working conditions. RITO Excavator Swing Gearbox Assembly 39Q8-12101 R300LC-9 R300 R305 Hydraulic Swing Reduction Drive Rotary Unit provides efficient hydraulic power transmission, stable torque conversion, and dependable slewing performance for Hyundai excavator applications. The 39Q8-12101 swing gearbox is commonly applied to Hyundai R300LC-9 and related R-series excavator swing drive systems.
Item NO.:
39Q8-12101Order(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 reduction drive 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 39Q8-12101 assembly functions as a swing reduction gearbox that transfers hydraulic motor power to the upper structure through a rotary reduction mechanism for controlled excavator rotation.
| Part Number | 39Q8‑12101 / 39Q8‑12101 |
|---|---|
| Part Name | R300LC‑9 R300 R305 Excavator Swing Gearbox Assembly Hydraulic Swing Reduction Drive Rotary Unit |
| Compatible Brand | HYUNDAI |
| Applicable Models | R300LC‑9, R300, R305 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 R300LC-9, R300, and R305 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 and transmission components to withstand vibration, impact loads, and long operating cycles in demanding jobsite environments.
Matches 39Q8-12101 specifications for Hyundai R300LC-9, R300, and R305 excavator hydraulic swing drive systems.
FAQ
Q: What operating conditions can accelerate R300 excavator swing gearbox wear?
A: Heavy-duty workloads, hydraulic oil contamination, insufficient maintenance, and frequent high-load swing operations can accelerate internal component wear.
Q: How does the 39Q8-12101 swing gearbox support excavator operation?
A: It reduces hydraulic motor speed and increases torque output, allowing the excavator upper structure to rotate smoothly and efficiently.
Q: What details should customers provide when purchasing a R300LC-9 swing gearbox?
A: Buyers should confirm the excavator model, original part number, gearbox appearance, mounting specifications, and working environment.
Q: Why is a complete swing gearbox assembly a preferred replacement solution?
A: A complete unit reduces installation complexity, shortens repair time, and helps restore reliable excavator swing performance more efficiently.
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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