Replacement Internal Gear Set for Futaba S3155 - FUAS4140  [FUAS4140]

S3155 Servo Gear Replacement Kit

This Futaba FUAS4140 gear set is supplied as a repair option for the S3155 servo, to replace stripped or worn teeth and restore dependable mechanical drive inside the unit.

Compatibility: specified for the Futaba S3155 model as named; verify official part numbers or supplier references before assuming compatibility with other servos.

Installation role: the replacement of internal gears can return lost positional accuracy and reduce play at the output shaft. Servicing typically requires removing the case, fitting the new gears with correct orientation, reassembling, and confirming neutral alignment and smooth travel.

Tuning implications: new gears do not change the servo's electrical response but will remove mechanical inconsistencies that can cause erratic feedback to the controller, supporting consistent steering and throttle inputs.