Yanmar B22 B25V B27 B37V ViO30 Final Drive | Compact Excavator Travel Motor

The Final Drive Assembly for the Yanmar B-Series (B22, B25V, B27, B37V) and the ViO Zero Tail Swing Series (ViO30) is a high-precision propulsion unit designed for the 2.0 to 4.0-ton mini excavator class. These units integrate a variable displacement axial piston motor with a high-torque planetary reduction gearbox, delivering the smooth, synchronized tracking and "zero-drift" performance that Yanmar machines are globally recognized for.

Restoring the Agility of the Yanmar Fleet The Yanmar B-Series and ViO30 are the workhorses of urban utility and landscaping. Their reputation for smooth, jerk-free travel depends entirely on the volumetric efficiency of the final drive. If your machine is "creeping" while digging or struggling to counter-rotate in soft soil, your internal travel motor is likely experiencing pressure bypass.

Our replacement units are manufactured to match the original Yanmar/Nachi hydraulic flow curves. Built with induction-hardened gears and high-load bearings, these drives ensure your machine tracks perfectly straight. Replacing a worn drive with our precision assembly restores the factory-standard breakout force and synchronized travel speed needed for precise utility work near delicate infrastructure.

These Yanmar models are global staples, and our drives are optimized for:

• Europe & North America: Ideal for the Rental and Residential Construction sectors. These units are built for high-frequency use and are fully compatible with eco-friendly biological hydraulic fluids often required in urban zones.

• Southeast Asia & Oceania: Features reinforced "Duo-Cone" floating seals to prevent the ingress of abrasive volcanic dust, tropical mud, and high-salinity water.

• Japan: Specifically tuned to match the ultra-smooth pilot-control systems of Japanese-spec models, ensuring the machine maintains its "natural" operator feel.

• The "Silent Killer" (Case Drain Pressure): Mini excavators like the B27 and ViO30 are highly sensitive to case drain backpressure. Before installing a new motor, you must ensure the case drain line is clear. A blockage here will blow the shaft seal within minutes.

• Gear Oil Management: Change the planetary gear oil every 250–500 operating hours. Check for a "milky" appearance frequently—this indicates water ingress that will quickly grind down your gear teeth.

• Sprocket Bolt Security: These machines generate significant vibration. Always use new Grade 10.9 or 12.9 bolts with a high-strength thread locker to prevent the sprocket from working loose and damaging the drive flange.

• System Priming: Never run a new motor "dry." Fill the motor case with clean hydraulic oil through the highest drain port before starting the engine to ensure instant lubrication.

Guangzhou Tieqi Construction Machinery Co., Ltd. (IRON CAVALRY) is strategically located in Guangzhou's Huangpu District, approximately an hour from Baiyun International Airport. We have been a dedicated specialist in engineering machinery hydraulics for nearly 15 years.

Driven by our core values of "Pragmatism and Progress," we are committed to delivering practical solutions and upholding our responsibilities. This principle-driven approach defines all our operations and client partnerships.

In China's excavator hydraulic assembly sector, our efficient execution and rigorous approach to manufacturing every product to meet over 95% of original performance specifications have built widespread trust. This has made us a destination for industry peers and clients seeking knowledge and reliable supply.

Our capability is backed by a ready inventory of over 500 assembly types, providing access to more than 6,000 different parts. Hydraulic pump, control valve, travel, and swing assemblies are our core products, with a distinct advantage in large mining excavator components and hard-to-find items.

Our 4,000-square-meter factory in Guangzhou is equipped for professional manufacturing, precision assembly, rigorous testing, and quality certification, ensuring reliable performance and timely delivery for every order.

For large items, we use sturdy plywood crates secured with metal fasteners for added stability. Inside, the products are cushioned with bubble wrap and secured with wooden braces, while special attention is given to protecting vulnerable parts. Externally, the crates are reinforced with high-strength PET plastic strapping and wrapped in highly waterproof black film.

• One-stop solution provider for all your hydraulic component needs
• High-quality products at competitive prices
• Exceptional customer service that makes you feel at home
• Large inventory, short delivery times, and long warranty periods
• Professional expertise with accurate part number identification for excavator components