Futaba S9255 Gear Assembly FUAS4128 AS4128 EBS3284 Compatible with Futaba  [FUAS4128]

Gear assembly overview for S9255

The Futaba FUAS4128 gear assembly is supplied as a replacement set for Futaba S9255 servos and is associated with part codes AS4128 and EBS3284. This description highlights correct fitment, inspection points, and routine care rather than making performance claims.

When installing, replace only with the matching part and check spline engagement, endplay, and bearing condition. Inspect the output shaft and gearbox for wear or scoring before committing to the new gears. Use recommended lubricants sparingly and secure the output horn without over-torquing to avoid stressing the gear train.

From a service perspective, fitting fresh gears can tighten mechanical play and restore consistent control feel, provided the rest of the gearbox and bearings are in good condition. If the servo showed grinding or excessive noise, address bearings and housing before completing the gear swap.

Intended for service and repair of Futaba S9255 units, this gear assembly lets you replace failed internal gears to return the servo to mechanical order.