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

Component Summary

This first gear is supplied as a direct replacement for the Futaba servo models listed in the product title. It is provided without retail packing and functions as the internal primary reduction gear for the stated servos.

Fitment is limited to the explicitly listed model identifiers: S9075, S9157, BLS152, BLS157HV, BLS172SV/HV, and BLS177SV. Verify the servo model code before purchasing to avoid compatibility issues.

Service notes: remove power and open the case carefully, keep washers and bearings in their original order when dismantling, and align splines correctly when refitting the gear. After reassembly, manually check mesh and axial play before reapplying power. This part is intended for servicing and on-track repairs rather than as a performance upgrade.