Hirobo HI0301043 Main Gear Upper for XRB SR Helicopters  [HI0301043]

Main Gear Upper for XRB SR

This HIROBO component is an RC-scale main gear upper intended for XRB SR helicopter platforms. It serves as the upper section of the main transmission gear assembly and is offered as a direct replacement part for worn or damaged components in the drivetrain.

Installation notes: verify fit on the main shaft and check axial and radial alignment before final tightening. Inspect mating gear teeth and associated bearings for wear, confirm correct spur engagement, and torque fasteners to manufacturer-recommended values for the airframe.

Tuning and maintenance role: replacing the upper main gear helps restore correct mesh and reduces vibration introduced by degraded gear surfaces, making it a useful part during routine maintenance or pre-flight checks on RC helicopters built on the XRB SR platform.