Futaba FUAS4122 Replacement Case for S3107 Servo  [FUAS4122]

Service Housing Details

This Futaba FUAS4122 servo case set is provided as a service replacement for the S3107 series servo. Supplied without retail packaging, the components restore the external shell so the original internal mechanics remain unchanged.

Replace the shell when you notice cracked walls, stripped mount bosses, or misaligned openings that compromise installation. The replacement preserves the factory mounting geometry and internal clearances so mounting holes, spline alignment and connector access follow the original S3107 specification.

Installation summary: open the servo and record gear order, shim positions and connector orientation; move the gear train and PCB into the new housing; tighten internal fasteners and confirm spline alignment prior to refitting in the model. After reassembly, verify neutral and endpoints on your transmitter to ensure the servo behaves as before.

Durability note: fitting a fresh case restores secure mounting and reduces play at mount points, which helps maintain consistent control response during regular use and after setup changes.