Futaba BLS174HV & BLS174SV Servo Gear Replacement FUEBS3411  [FUEBS3411]

Futaba BLS174 Gear Service Overview

This gear set is an RC-scale replacement intended for Futaba BLS174HV and BLS174SV servos, supplied under part reference FUEBS3411 and linked to AS4189 and EBS3411 identifiers. It is intended to restore mechanical drive inside the servo when original gears show wear or damage.

The write-up concentrates on practical fitment and workshop checks rather than performance claims. When replacing gears, verify servo case orientation, preserve bearing and spacer positions, and keep gear meshing alignment consistent to avoid binding during operation.

For setup checks, inspect the servo for excess backlash after reassembly and confirm the horn and spline engagement are correct before applying load. This part is described strictly as a model-grade servo repair component for hobby RC use.