The Hirobo HI0404639 counter gear serves as a replacement intermediate gear for pipe drive systems on Eagle-series rotorcraft. Its role is to transmit rotation from the pipe drive to the main gearbox elements while maintaining accurate mesh to avoid drivetrain noise and loss.
Marked 18T for its tooth count, this gear is sized to match the centre distances and mating gears used in Eagle, Freya, EX and SX platform variants. It is intended as a service part to restore precise engagement when the original component is worn.
Fitment notes: press the gear onto the counter shaft ensuring correct seating and axial alignment, check engagement with mating spur gears, and reapply retaining hardware torqued to spec. Inspect adjacent bearings and shafts during replacement to identify any play that could degrade teeth prematurely.
Tuning tips: small mesh adjustments can reduce vibration; aim for smooth tooth contact under load, inspect for chipping after heavy impacts, and lubricate appropriately for model gear trains. Routine replacement of worn gears helps maintain efficient drivetrain response and lowers vibration risk.
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