Futaba S3107 Service Case Set FUAS4122  [FUAS4122]

S3107 Case Overview

This Futaba FUAS4122 servo case set is a service replacement designed for the S3107 series servo. Supplied without retail packaging, the set provides the external housing parts needed to replace a damaged or worn case while leaving the internal mechanics unchanged.

Fit this case set when the original shell shows cracking, worn mounting bosses, or alignment faults that hinder proper installation. The replacement preserves factory mounting geometry and internal clearances so mounting holes, spline alignment and connector access remain consistent with the S3107 specification.

Installation notes: remove the servo cover and record the order of gears, shims and connector positions, move the internal gear stack and PCB into the replacement case, tighten internal fasteners and confirm spline alignment before refitting in the model. After reassembly, check neutral and endpoint response on the transmitter to ensure calibration remains correct.

Compatibility advice: the FUAS4122 is intended as a replacement housing for S3107 servos; confirm your servo matches the S3107 layout and mounting points for a correct fit.