The Hirobo HI0414177 spare is a 20-tooth bevel-style gear supplied complete with its shaft, intended for use in Eagle Freya helicopter parts. The item replaces worn drivetrain gear assemblies and restores correct meshing where the gearbox and bevel interface.
Installation notes: verify shaft seating and axial play before final assembly, check mating gear mesh at low throttle, and confirm that surrounding bearings rotate freely. Use thread locker only on fasteners specified by your kit instructions and avoid over-tightening which can introduce preload on bearings and alter gear alignment.
Tuning role: this gear serves as a direct replacement to recover drivetrain geometry and allow fine gear mesh adjustment for quieter, more efficient power transfer. Inspect adjacent bearings and the mating pinion when fitting to identify any wear that may have caused the original failure.
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