Futaba FU1K37601 BLS351 first gear replacement part  [FU1K37601]

BLS351 First Gear Replacement

This replacement first gear is offered as a direct-service component for Futaba BLS351 servos used in radio-controlled models, intended to restore correct gear engagement when the original first-stage gear is worn or damaged. It is an RC-scale spare part for maintaining servo performance and reliability.

Installation requires opening the servo case, removing the gear stack, and swapping the first gear while preserving bearing and spacer positions. Reassemble carefully, checking that the output spline and servo horn align properly, and verify free movement before applying power to avoid binding.

In tuning and maintenance workflows, the first gear plays a role in gear mesh and backlash; replacing a worn first-stage gear can remove slop and improve consistency in steering or control surfaces. After replacement, confirm neutral position and run a few test cycles under low load to ensure smooth operation.