Servo Gear Replacement Kit for Futaba S3117 and S3157 - FUAS3274  [FUAS3274]

Precision replacement gears for S3117/S3157

This RC-scale replacement pack is intended for Futaba-listed S3117 and S3157 servos and the related internal gear assemblies noted by AS3274 and EBS3358 codes. It focuses on reestablishing correct internal gear geometry and mesh after wear, maintaining expected servo performance in model applications.

Fit this set when a servo displays excessive play, drifting centre, or intermittent gear noise caused by worn or damaged teeth. The components are supplied to match the original gear train layout referenced in the product identifiers.

Installation notes and tuning role:

• Confirm the model marking on the servo case is S3117 or S3157 before you open the unit.
• Remove the cover and compare the factory gear stack with the replacement set to ensure orientation and order are identical.
• With the new gears fitted, rotate the output spline by hand to check for smooth mesh and free movement before reapplying power or reconnecting linkages.
• Use transmitter trim and end-point adjustments to verify restored centring and travel; listen for any unusual noises while testing under light load.