Futaba FUAS4128 Servo Gear Set AS4128 EBS3284 for Futaba S9255  [FUAS4128]

Servo gear set for S9255

This Futaba FUAS4128 gear set provides a direct-replacement gear assembly intended for Futaba S9255 servos as identified by AS4128 and EBS3284 codes. The write-up focuses on fitment, basic installation checks, and the role of the gear set in tuning and maintenance rather than performance claims.

Use this gear set to restore mechanical function when internal gears are worn, stripped, or damaged. During swap, verify spline alignment and endplay, inspect bearings and output shaft for damage, and confirm servo centring before reinstallation. Apply only manufacturer-recommended lubricants if needed and avoid over-tightening the output horn to prevent undue stress on the new gears.

For tuning, replacing worn gears can reduce play and restore repeatability in control inputs; however, correct gear mesh and secure mounting remain essential to avoid premature wear. If the original servo showed unusual noise or binding, inspect the gearbox housing and bearings before fitting the replacement gears.

This replacement gear set is intended for maintenance and repair of Futaba S9255 servos, offering a straightforward path to restore mechanical integrity when internal gears fail.