This Futaba FUAS4140 gear set provides replacement internals for the S3155 servo, allowing worn gear teeth to be renewed and the unit returned to predictable mechanical performance.
Compatibility: built for use with the Futaba S3155 servo model as indicated; do not assume this kit fits other servos without consulting manufacturer compatibility documentation.
Installation role: renewing the internal gear train can remove play and recover accurate positioning at the output. Typical servicing includes opening the case, replacing the gear components, reassembling carefully, and verifying neutral and travel endpoints before refitting in the vehicle.
Tuning implications: new gears will not alter electrical speed or torque, but they eliminate mechanical backlash that can degrade steering and throttle precision in scale RC models.
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