FUAS4126 Futaba Replacement Gear Set for S9155 & S9351  [FUAS4126]

Internal gear kit for S9155 and S9351

The FUAS4126 kit is an RC replacement gear pack intended for Futaba S9155 and S9351 servos, allowing technicians to repair or refresh internal gear trains without altering the servo enclosure.

Typical swap procedure covers removing the case, mapping the gear stack order, fitting the replacement gears, and reassembling while ensuring correct mesh and acceptable endplay. The description reiterates compatibility with the S9155 and S9351 labels shown in the part title.

When performing maintenance or tuning, new gears restore the designed mechanical interface and aid in maintaining steady, predictable control responses; use minimal servo-specific grease and verify unobstructed rotation before refitting the servo into the model.

The FUAS4126 is supplied as a maintenance spare to replace internal gears in compatible Futaba servos, helping to recover dependable mechanical operation in model applications.