Hyundai R305 Travel Motor Assy 31N8-40011 JCK-00123 for Excavators

Belparts excavator R305 final drive gearbox 31N8-40011 JCK-00123 for mini excavator parts

The excavatortravel motor assembly is a critical component of the machine’s chassis system, responsible for supporting the entire weight and providing mobility. It typically consists of tracks, sprockets, idlers, rollers (carrier and track), and travel motors. The design of the undercarriage directly impacts the excavator’s stability, traction, and operational efficiency. A high-quality undercarriage ensures smooth movement across rough terrain, minimizes slippage and wear, and offers excellent durability for demanding applications in mining, construction, and agriculture.

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The final drive bridges this gap through gear reduction. Picture a small, fast gear (driven by the hydraulic motor) turning a much larger gear. The large gear turns slower but with far greater force. The final drive uses a compact, efficient planetary gear system to achieve an even more dramatic reduction within a small space.

Typically, multiple reduction stages are stacked. Each stage consists of a central sun gear (input), multiple planet gears meshing with it and an outer ring gear (fixed to the housing). As the sun gear spins, it forces the planet gears to "walk" around the inside of the ring gear. The planet carrier, holding these planet gears, rotates slower than the sun gear but with massively increased torque. This output torque from the carrier drives the sprocket shaft. Reduction ratios can be 50:1 or higher! This means for every 50 rotations of the hydraulic motor, the sprocket might only turn once, but with 50 times the turning force – enabling the excavator to overcome immense resistance.

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GUANGZHOU BELPARTS ENGINEERING MACHINERY LIMITED founded in September 2013, loed in the engineering machinery market in Guangzhou, China. At present , we have one shop, one warehouse and one office as well as a professional team for purchasing, selling, packing, shipping and after-sale service.

Our main products are Excavator Hydraulic spare parts, Hydraulic pump, Swing motor, Travel motor, Final drive, Swing gearbox, Travel gearbox, Control valve,Monitor,Controller, Hydraulic cylinder and other hydraulic items with genuine and aftermarket quality. Until now, our products enjoy high reputation all over the world and have been exported to more than 150 countries and regions, spreading all over the Middle East, Southeast Asia, Africa, North America, South America, Europe and Oceania with its own brand "Belparts" are widely acclaimed by foreign customers.

In February 2023, Belparts Yunnan Tourism Team Building

In April 2024, Belparts participated in the Brazil Construction Machinery Exhibition and visited local clients in Brazil.

In April 2024, Belparts participated in the French Construction Machinery Exhibition and visited clients in France and Spain

In May 2024, Belparts Travel Thailand