The Futaba FUBS3285 upper and bottom shells are manufactured as replacement housings for the Futaba S9351 and S9155 servos. They are intended to restore the external casing and preserve the internal layout rather than alter any electronic functions.
Fitment is specific to the S9351 and S9155 models; confirm compatibility before attempting to install on other units. The shells are built to shield gears and maintain internal alignment for routine servicing tasks.
When fitting the shells, transfer internals carefully, double-check gear mesh and axial play, and secure screws to the recommended torque. After reassembly, validate servo travel and centring with your transmitter or a testing tool.
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