Futaba FU1K26101 Servo First Gear replacement for S9152 S9153  [FU1K26101]

Servo first gear replacement

This Futaba FU1K26101 first gear is an RC-scale replacement part intended for use with Futaba S9152 and S9153 servos. It is supplied without retail packing as indicated in the product title. The component serves as the input-stage gear that transfers motion from the motor/pinion assembly into the servo gearbox, so its condition directly affects steering and control responsiveness in scale RC models.

Installation notes: remove the servo horn and case screws, extract the internals carefully and note gear stack order before removing the first gear. Inspect the surrounding bearings and the mating pinion for wear or burrs, then fit the replacement gear ensuring correct axial alignment and a light, even gear mesh. Reassemble and test free rotation before final installation in the model.

Tuning and maintenance role: replacing a worn first gear can reduce slop and inconsistent centring, helping to restore predictable control feel. When servicing, check for contamination, replace grease if degraded, and verify that the servo operates through its full travel without binding after the gear change.