Futaba FU1K39101 Servo First Gear for S9075 S9157 BLS152 BLS157HV BLS172SV/HV BLS177SV (w/o packing)  [FU1K39101]

Product overview

This is a direct replacement first gear intended for Futaba servo models listed in the title. The part ships without retail packaging and is supplied as the internal gear component used in the primary reduction stage of the listed servos.

Compatibility is limited to the models explicitly shown: S9075, S9157, BLS152, BLS157HV, BLS172SV/HV, and BLS177SV. Confirm your servo model code before ordering, do not assume fitment beyond these model identifiers.

Installation notes: remove the servo case and power down the system before service, retain washer and bearing positions when disassembling, and observe spline orientation when fitting the replacement gear. After reassembly check gear mesh and endplay by hand before applying power. This component supports routine maintenance and on-track repairs rather than performance upgrades.