Futaba FU1K18802 Servo First Gear for S9155 S9255 S9351  [FU1K18802]

Servo First Gear Replacement for Futaba S9155/S9255/S9351

This replacement first gear is an RC-scale servomotor spare intended for Futaba servo models S9155, S9255, and S9351. It is offered as a single gear piece for rebuilds where the original first gear shows wear, stripped teeth, or damage from impact.

Role and tuning impact: the first gear interfaces the motor pinion and the rest of the gear train, so a worn or damaged first gear can introduce slop, inconsistent centring, and reduced positional accuracy. Replacing this gear restores proper tooth engagement and helps maintain repeatable servo centring during tuning and setup.

Installation notes: confirm model compatibility with S9155, S9255, S9351 before disassembly, remove the servo horn and case carefully, inspect splines and mating pinion for wear, reassemble with correct spline alignment and check free movement before powering the servo. Use appropriate small fasteners and avoid over-tightening that could bind the gear train.