This HIROBO HI0403244 counter gear is a direct replacement listed for the GPH 346 family of model helicopters and is specified as a 14T gear. In the drivetrain the counter gear transfers rotation between the motor pinion and the main gear train, so correct mesh and alignment are important for reliable power transfer and reduced wear.
Installation notes: inspect the mating shaft and bearings for wear before fitting the gear, confirm the gear seats squarely on the countershaft, and set a conservative gear mesh before full-power testing. Use the original retaining hardware and verify free rotation of the main and counter shafts after installation.
Tuning and maintenance role: swapping a worn or incorrect counter gear will alter timing and gear lash; replacing with the correct 14T unit restores intended gear ratios and helps maintain predictable flight response. Regular visual checks during maintenance cycles will catch early tooth or bearing wear.
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