This Futaba FUAS4140 gear set is offered as a replacement option for the S3155, intended to restore internal gearing when original teeth become worn or start to slip and affect performance.
Compatibility: produced for the Futaba S3155 servo model as stated; confirm fitment against Futaba part cross references before attempting installation on other servo types.
Installation role: replacing the internal gear train can recover accuracy and reduce endplay at the output shaft. The work usually requires opening the case, swapping the gear elements, refitting the enclosure, and checking that the servo returns cleanly to neutral and achieves full, even travel.
Tuning implications: while gear swaps do not alter the servo electronics, fresh gears eliminate backlash and irregular feedback that can otherwise cause inconsistent control inputs in scale RC rigs.
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