GPH 346 GT Counter Gear Case for Belt Drive - HI0403303 by Hirobo  [HI0403303]

Replacement Counter Gear Housing

This component is a direct replacement for belt-driven GPH 346 GT assemblies, the Hirobo HI0403303 counter gear case is designed to house the counter gear and guide belt routing in the drivetrain. It helps re-establish alignment and provides a stable mounting point to reduce lateral play that can negatively affect belt tracking and efficiency.

When wear or impact has compromised the original case, swapping in a new unit restores proper belt mesh and tension without changing transmission geometry. During service, check adjacent bearings and the belt for wear, ensure the case seats flush, and verify smooth rotation of the drivetrain before performing flight tests.