Futaba FUAS4122 Servo Case Set for S3107 Servo  [FUAS4122]

Servo Case Replacement

This Futaba FUAS4122 servo case set is a service replacement intended specifically for the S3107 series servo. Supplied without retail packing, the set provides the external housing components needed to replace a damaged or worn case while retaining the original internal mechanics.

Use this case set when the existing shell has cracks, stripped mounting points, or compromised alignment that affect servo installation. The part preserves factory mounting geometry and internal clearances so mounting holes, spline alignment and connector access remain consistent with the original S3107 layout.

Installation overview: remove the servo cover and note the position of gears, shims and connectors, transfer the internal gear stack and PCB into the replacement case, secure internal fasteners and verify spline alignment before reinstalling into the model. After reassembly, confirm neutral position and endpoint behaviour on your transmitter to ensure alignment and calibration are unchanged.

Practical role for tuning and maintenance: replacing a damaged case restores stable mounting and repeatable servo geometry, which helps maintain steering or control precision during setup and tuning without altering the servo’s internal performance.