SX Series Hirobo HI0404513 Precision Auto-Rotation Shaft  [HI0404513]

Overview: SX Series Autorotation Shaft

The HI0404513 drive shaft is the replacement autorotation component for Hirobo SX series helicopters, designed to transfer rotational drive to the tail assembly in RC models.

Fitment and role: this shaft links autorotation components to the tail drive route and works with the gearbox and tail assembly. During replacement, check mating splines and bearing fit to ensure consistent motion transmission.

Installation notes: isolate power and stabilise the airframe before removing the old shaft. Insert the new shaft evenly into bearings, verify there is no binding throughout motion, and secure fasteners to the proper specification.

Tuning and maintenance: while the shaft does not on its own alter basic flight performance, correct installation and bearing condition influence autorotation response and tail control. Recheck rotor endplay and tail tracking after fitting.