Precision Servo Gear Set FUAS4155 for Futaba BLS252  [FUAS4155]

Servo Gear Replacement Guide

This Futaba FUAS4155 gear set is intended as the replacement internal gear train for BLS252 servos used in hobby electric RC models. The part codes AS4155 and EBS3362 are provided to match the gear kit to the original BLS252 assembly.

Install this kit when the servo exhibits gear noise, backlash, or stripped teeth that undermine steering or throttle precision. Replacing the internal gears helps re-establish accurate positional control and stabilizes response during setup.

Follow careful disassembly procedures and retain the exact gear stacking order plus any shims or spacers. After fitting, verify neutral, end points, and unobstructed travel before reinstalling the servo into the model to avoid misalignment or binding.

For workshop servicing of BLS252 units, this Futaba-designated gear set supplies the correct part numbers to renew the internal gear train and return the servo to reliable operation.