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

First-stage servo gear replacement

This Futaba FU1K26101 first gear is a direct replacement for Futaba S9152 and S9153 servos used in scale RC models. It ships without retail packaging as noted in the product title. As the input-stage gear it transfers motion from the motor pinion into the gearbox and therefore its condition influences steering precision and control response in scale setups.

Installation notes: remove the servo horn and case screws, extract the internals carefully and note the 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 reduces slop and inconsistent centring and helps 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.