GPH 346 GT Replacement Gear Case (Belt Drive) HI0403303 - Hirobo  [HI0403303]

Heavy-Duty Gearcase Replacement

Made for belt-driven GPH 346 GT models, the Hirobo HI0403303 counter gear case serves as a replacement housing for the counter gear and belt guide in the drivetrain. Its design focuses on restoring correct alignment and offering a robust mounting point to limit lateral movement that can degrade belt tracking and mechanical efficiency.

For maintenance, replace the case when components show wear or following an impact; fitting a fresh housing helps re-establish proper mesh and belt tension without altering the rest of the transmission layout. While servicing, inspect the belt and bearings, fit the case securely, and check that the drivetrain spins freely before any operational checks.