Futaba FU1K09301 Servo First Gear  [FU1K09301]

Replacement gear for Futaba servos

This Futaba FU1K09301 first gear is a direct spare part intended for maintenance of compatible Futaba servos listed as S3401 and S9404. It is supplied without retail packing and is offered as a single replacement gear for hobby-scale applications.

Installation generally involves opening the servo case, removing the worn first gear, and fitting the replacement while checking gear mesh and bearing alignment. Keep fasteners and internal components organised during the swap to maintain original servo geometry.

As a maintenance item the first gear helps restore steering feel and repeatability when worn teeth cause slop or inconsistent centring, and it is useful when preparing a radio system for track days, practice sessions, or routine servicing.