Futaba Servo Case Kit for S3114/S3154 Models - FUBS3321  [FUBS3321]

S3114/S3154 case replacement overview

The Futaba FUBS3321 case kit provides replacement outer shells for Futaba S3114 and S3154 servos, enabling enclosure renewal without changing the internal electronics. The write up highlights correct fitment, careful installation practice, and how the cases aid in setup procedures.

Fitting the new shells is a mechanical process: remove the servo horn and fixings, transfer the internal gearset and bearings into the replacement housing, then reassemble ensuring correct mesh and bearing alignment. Work on a clear bench and keep fasteners separate to avoid assembly errors.

For tuning or race-day adjustments, matching replacement cases help preserve servo mounting geometry so linkages and brackets remain true after a swap, reducing setup time.