First Gear Replacement for Futaba S3401 and S9404 - FU1K09301  [FU1K09301]

First gear spare for Futaba servos

The Futaba FU1K09301 first gear is provided as a direct replacement compatible with Futaba S3401 and S9404 servos. It ships without retail packing and is intended as a single service part for hobby repair tasks.

Fitting usually requires opening the servo enclosure, swapping out the worn first gear, and checking bearing seating along with gear mesh. Maintain order of small parts during the procedure to preserve servo geometry.

As a simple maintenance part the replacement gear will improve steering consistency and reduce slop caused by damaged teeth, helping restore original centring and repeatability.