The Hirobo HI0404639 counter gear is supplied as a replacement item for pipe drive arrangements on Eagle-series rotorcraft. It operates as an intermediate gear in the transmission sequence, ensuring rotation is correctly transferred between the pipe drive and the primary gearbox while preserving alignment to model specifications.
Designed for Eagle, Freya, EX and SX variants, the item is suitable for use when the original gear shows signs of wear. The 18-tooth configuration is selected to maintain the correct centre distance and tooth engagement in compatible pipe drive assemblies.
Installation pointers: fit the gear to the counter shaft with correct axial seating, verify engagement with the mating spur or intermediate gears, and secure retaining parts to the recommended torque. During replacement, examine adjacent shafts and bearings for play that might accelerate tooth deterioration.
Care and inspection: aim for a light, full-contact mesh to reduce wear, check teeth for chipping after impacts, and apply grease appropriate for model gear systems. Prompt replacement of a compromised counter gear preserves drivetrain performance and limits vibration transfer.
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