The HI0403245 counter gear joint shaft from Hirobo is a service replacement part for GPH 346 helicopter gear assemblies. Intended for the counter gear section, the shaft transmits rotation between paired gears inside compatible GPH 346 drivetrain builds.
Installation notes: align the shaft with the counter gear housing using factory reference marks, verify gear face contact and runout, and ensure any bearings that touch the shaft are free of grit before final tightening. Use the model's specified hex tools and follow the recommended screw tightening pattern to maintain correct mesh.
Durability and tuning: replace this shaft when shaft damage or excessive gear lash causes rough operation. During setup, inspect gear mesh and axial endplay under slow rotation and run a short bench test to confirm smooth, quiet engagement prior to flight.
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