S3170G Servo Replacement Case Shell - Futaba FUAS4158 (W/O PACKING)  [FUAS4158]

Replacement Servo Case Overview

The Futaba FUAS4158 servo case set is a replacement outer shell made for the S3170G servo and is supplied without retail packing. It provides a straightforward housing swap to protect internal components during bench work and to restore worn or damaged shells.

This item is intended specifically for the S3170G; confirm your servo model before fitting. It is a mechanical casing replacement rather than an electronic upgrade, and it facilitates workshop tasks such as inspection, bearing access, and reassembly during setup and tuning.

Installation notes: remove the servo horn and output gear as required, keep track of internal shims and bearings, transfer internal components into the replacement case, and tighten fasteners evenly without over-torquing to avoid twisting the case. After assembly, cycle the servo on a bench at a safe voltage and neutral endpoints to verify smooth operation before reinstalling in the model.

In practical tuning work, fitting a new case helps maintain consistent servo mounting geometry and alignment in the chassis, which supports repeatable steering and trim adjustments during setup sessions.