BLS252 Servo Internal Gear Set FUAS4155 for Futaba  [FUAS4155]

Genuine Replacement Gear Train

This Futaba FUAS4155 gear set is specified as the replacement internal gear train for BLS252-class servos, intended for hobby-scale electric RC models. The deliverable part codes AS4155 and EBS3362 identify the set in Futaba's parts system and help match the gear pack to the original BLS252 assembly.

Use this gear set when a BLS252 servo shows gear chatter, backlash, or stripped teeth that affect steering or throttle feel. Replacing worn gears can restore positional repeatability and reduce inconsistent responses during model setup and tuning.

Installation requires careful servo disassembly and reassembly, keeping the original gear stacking order and any shims or spacers. After fitting, check end-to-end travel and neutral position before reinstalling the servo in the model to avoid binding or incorrect horn alignment.

For technicians and hobbyists maintaining BLS252 servos, this genuine Futaba gear set provides the matched part numbers needed to replace an internal gear train and return the servo to consistent operation.