Futaba First Gear Upgrade for S9155 S9255 S9351 - FU1K18802  [FU1K18802]

Upgrade First Gear for Futaba S9155, S9255, S9351

Designed for use in Futaba servos S9155, S9255, and S9351, this first gear is supplied as a single unit for repair or upgrade tasks. It is intended to replace an original gear that has worn teeth or has been damaged by shock.

Role and tuning impact: the first gear directly affects how the motor pinion drives the gear train, and a compromised gear can cause inconsistent centring and increased play. A new first gear helps return predictable positional accuracy and steadier feedback while tuning the system.

Installation notes: verify fitment with S9155, S9255, and S9351 before dismantling. Remove the horn and housing with care, inspect splines and the pinion for wear, ensure proper spline engagement on reassembly, and confirm smooth free rotation before powering up. Use suitable small tools and avoid overtightening screws that could bind the gear train.