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

Gearing replacement for S9155/S9351 servos

The FUAS4126 gear set is supplied as an aftermarket replacement for Futaba S9155 and S9351 servos, used to rebuild or alter internal gear arrangements while leaving the servo casing intact.

Designed for direct swaps, the process typically includes removing the cover, recording gear positions, installing the replacement parts, and reassembling while checking mesh and endplay. The product description confirms compatibility with the S9155 and S9351 identifiers from the part name.

Replacing worn gears during tuning or maintenance restores the intended mechanical interface and supports predictable servo response for steering and throttle. Use only a light coating of suitable servo grease and check for smooth, unobstructed rotation before returning the unit to service.

As a maintenance spare, the FUAS4126 gear set helps recover mechanical integrity in compatible Futaba servos and extend service life.