This Futaba FUAS4140 gear set is supplied as a replacement option for the S3155 servo, intended to restore internal gear function when original teeth wear or slip. The text focuses on compatibility with the S3155 series and the functional role of gears inside typical RC servos.
Compatibility: designed for the Futaba S3155 servo model as indicated by the product name; do not assume fitment to other servo models without verification from manufacturer references.
Installation role: replacing worn internal gears can recover positional accuracy and reduce play in the servo output. The procedure generally involves opening the servo case, exchanging the gear train components, reassembling the case, and verifying neutral position and travel. After replacement, check endpoint limits and perform a basic functional test to confirm smooth rotation and return-to-center behavior.
Tuning implications: while gears do not change electrical response, worn teeth can introduce backlash and inconsistent feedback to the controller; fresh gears help maintain precise steering and throttle response in scale RC models.
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