Servo Housing Compatible with S3107 - Futaba FUAS4122  [FUAS4122]

Shell Fit and Maintenance

This Futaba FUAS4122 servo case set serves as a replacement shell specifically for the S3107 servo line. The item is sold without retail packing and supplies the external housing pieces needed to replace a damaged or worn case while retaining the original internal mechanism.

Use the case set when the current shell exhibits hairline cracks, damaged mounting tabs, or alignment shifts that affect installation. The replacement maintains factory mounting geometry and internal clearance so mounting holes, spline orientation and connector access stay consistent with the original S3107 arrangement.

Brief installation guide: remove the existing cover, mark gear and shim order, transfer the gear train and PCB into the replacement housing, secure internal screws and confirm spline alignment before reinstalling in the model. After reassembly, test neutral position and endpoints via your transmitter to ensure calibration is unchanged.

Tuning impact: a true-to-form replacement shell helps keep mounting points rigid and repeatable, supporting consistent steering characteristics and predictable setup adjustments without altering the servo internals.