This Futaba FUAS4155 gear set is intended as the replacement internal gear train for BLS252 servos in hobby electric RC models. The included part identifiers AS4155 and EBS3362 are the entries to match this pack to the original BLS252 assembly.
Fit this kit when you observe gear noise, odd play, or teeth damage that affect servo precision. Fresh gears help re-establish accurate positioning and more consistent control inputs during vehicle setup.
Careful disassembly and reassembly are essential: preserve the original gear order and any shims or spacers. Validate end points and neutral position after reassembly to ensure the servo horn sits correctly and the linkage does not bind.
For field repairs and workshop servicing of BLS252 servos, these Futaba-designated part numbers let you replace the internal gear train and restore reliable servo operation.
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