The Hirobo HI0404548 bearing holder serves as a compact replacement piece for SX 17S gearboxes in the Eagle, Freya, EX and SX model ranges. It secures a 19mm bearing seat to maintain correct rotor and tail alignment during flight.
Functionally the holder provides a stable support and locating surface for the bearing and shaft. Correct installation reduces drivetrain slop and helps keep pitch, yaw and collective adjustments consistent after setup work.
To install, remove the relevant cover or subframe, clean and inspect mating areas for wear, fit the new holder and ensure the bearing is seated properly and the shaft runs true before closing up. Finish with a full controls check and a cautious initial hover to confirm there is no interference.
Fit the HI0404548 bearing holder when replacing worn bearing seats or when tuning transmission geometry on compatible Hirobo helicopters; always verify seating and alignment during servicing to preserve predictable handling.
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