The Futaba FUEBS3379 servo case set supplies a direct replacement housing for BLS651 series servos. It is an external shell intended to restore a damaged case or refresh an older servo body, and it does not imply any change to the unit's internal electronics or declared performance.
When installing the case, ensure the FUEBS3379 part matches your BLS651 marking. Carefully remove the existing housing while preserving internal alignment, move gears, PCB and connectors exactly as positioned, and reassemble with attention to output spline engagement and correct gear mesh before testing the servo on the bench.
This accessory is aimed at maintenance and repair: it protects internal components, helps maintain consistent geometry during tuning, and lets you return a worn servo to service without replacing the whole unit. Perform the replacement as precision maintenance to avoid introducing play or misalignment.
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