Futaba FUAS3078 Case Set Upgrade for S135 S3501 S3502 S9601  [FUAS3078]

Shell features and tuning benefit

The Futaba FUAS3078 servo case set is supplied as a replacement housing for Futaba S135, S3501, S3502 and S9601 servos and is provided without original packing. It replaces a damaged exterior shell while preserving internal components, so the servo retains its factory mechanical alignment once reassembled.

Compatibility is restricted to the listed model numbers; verify the model stamped on your servo before purchase. When moving components, keep the gear stack and bearings in the same orientation, route the ribbon and motor lead as originally fitted, and avoid stressing soldered joints.

Fitting is straightforward for hobbyists: remove the case screws, lift the cover to expose the gears and motor assembly, transfer any necessary parts to the new case, and refit using the original fixings. Use a small hex driver and precision screwdrivers to protect threads and small parts.

Fitting a fresh case helps maintain servo horn alignment and mounting geometry, which supports consistent steering and throttle response when tuning the chassis.