Replacement First Gear FU1K26101 for Futaba S9152 S9153 Servos  [FU1K26101]

Replacement first gear for Futaba servos

The Futaba FU1K26101 is supplied as a replacement first gear for Futaba S9152 and S9153 servos used in scale radio-controlled models. The item is provided without retail packaging as indicated in the title. This part functions as the input gear that transmits torque from the motor pinion into the gearbox, so its condition has a direct effect on steering responsiveness and control behavior.

Installation notes: begin by removing the servo horn and unscrewing the case, then carefully lift out the internals and record the original gear ordering before removing the first gear. Examine the bearings and mating pinion for wear or burrs, fit the replacement ensuring correct axial position and a light, uniform gear mesh. Reassemble and verify free rotation prior to final installation in the model.

Tuning and maintenance role: fitting a new first gear can reduce slack and erratic centring, restoring a more predictable control feel. During service, remove contaminants, replace aged grease where needed, and confirm full travel operation without binding once the gear is fitted.