The Futaba FUBS3285 set supplies like-for-like upper and bottom shells created to fit Futaba S9351 and S9155 servos. These pieces are designed solely as mechanical enclosures and will not change the servo's electronics or internal gearing.
Do not assume interchangeability with other Futaba models or aftermarket servos; the fit is intended for the listed S9351 and S9155 units only. The shells protect the gear train, keep internal alignment, and permit straightforward swaps when performing maintenance.
Installation advice: remove the old case with appropriate tools, carefully move the PCB, gears, and output shaft into the replacement shells, check gear mesh and axial play, then secure the case and test servo movement using a transmitter or tester.
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