Hirobo HI0301109 Super Gear A for XRB SR Drive  [HI0301109]

Fit and Function Summary

This replacement Super Gear A is specified for the Hirobo XRB SR family and serves as a direct drivetrain element for hobby helicopters. It is intended where the main or intermediate gear needs servicing, helping to transmit torque while managing mesh and backlash control.

Installation fundamentals: before fitting, check mating gears and bearings for signs of wear, ensure the gear seats correctly on the shaft, and set mesh with minimal backlash to prevent accelerated tooth wear. Use familiar hobby tools and retain original housings and spacers from the XRB SR assembly for correct alignment.

Tuning role: the gear contributes to drive smoothness and power delivery; small adjustments in mesh and shaft alignment can change vibration and efficiency. After fitting Super Gear A, verify engagement through the operating RPM range and review any related pinion or spur gear positions in the XRB SR drivetrain.