The Hirobo HI0404639 counter gear is manufactured as a maintenance component for pipe drive based Eagle-family helicopters. It functions as an intermediate transmission gear, relaying torque between the pipe drive and the main gearbox while maintaining proper alignment to model tolerances.
Purpose-built for use with Eagle, Freya, EX and SX model variants, the gear is appropriate when the factory unit shows wear. The 18-tooth count ensures correct engagement geometry and centre-to-centre spacing in compatible pipe drive assemblies.
Installation guidance: press the gear onto the counter shaft with accurate axial seating, ensure correct engagement with adjacent spur or intermediate gears, and resecure fastenings to the recommended torque. Check related bearings and shafts for free play that might lead to accelerated tooth degradation when replacing this part.
Maintenance advice: set mesh to full but light contact to limit wear, inspect teeth after any heavy landing for nicks, and use suitable lubrication for the gear train. Regular inspection and prompt swap-out of a worn counter gear preserve drivetrain smoothness and reduce vibration.
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