S3115 S3116 Service Housing - Futaba FUAS4138  [FUAS4138]

Service housing compatible with S3115/S3116

This Futaba FUAS4138 servo case set serves as a replacement shell for Futaba S3115 and S3116 servos and is shipped without retail packaging. The description prioritizes fit and workshop use for hobby RC servos rather than claiming any performance benefit.

Use notes: compatibility covers only the S3115 and S3116 units listed; other Futaba models may vary internally. The case helps replace cracked or distorted housings, re-establish correct alignment of gears and PCB, and protect internal components during servicing.

Assembly tips: remove the horn and outer shell, keep a clear record of gear order and PCB orientation, move the gear stack and electronics into the new case checking for clearance and correct screw torque, then verify travel and centering via your transmitter. Preserve any metal shims or bearing placements from the original to maintain gear mesh.

Maintenance role: the component is intended to allow dependable reassembly after repairs and to keep mechanical alignment that supports smooth motion and accurate feedback from the servo. It is not intended as a tuning upgrade but as a maintenance replacement to restore original function.