XRB SR RC Helicopter Main Gear HI0301045 – Hirobo  [HI0301045]

Replacement gear for XRB SR models

The HI0301045 main gear is the specified replacement rotor component for XRB SR helicopters. It transmits motor torque to the rotor head on RC-scale helicopters and is supplied as a spare for scheduled maintenance and part replacement.

Installation should be carried out by a modeller familiar with rotorhead work: remove the canopy and rotor head, inspect bearings and shaft seating, then mount the gear in the correct axial position. Rotate the main shaft by hand to check mesh and clearance before powering up, and use shims or spacers to correct any tight or uneven engagement.

In setup and tuning this gear mainly governs mesh consistency and drivetrain smoothness rather than altering flight trim. Proper engagement reduces wear and keeps tail and rotor tracking predictable. Make it part of your pre-flight checks to inspect for chipped teeth or abnormal runout.