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

SX Series Auto-Rotation Drive Shaft Overview

This replacement drive shaft is listed as HI0404513 for Hirobo SX series helicopters and serves as the autorotation component that links to the tail drive on compatible RC models.

Fitment and role: the shaft transfers rotational motion between the autorotation mechanism and the tail drive path; ensure splines align and nearby bearings are in good condition when performing a swap to maintain smooth rotation.

Installation notes: remove power and support the airframe before servicing. Install the shaft straight into its bearings, confirm unrestricted rotation through the range of motion, and use the correct fasteners without over-tightening to prevent premature wear.

Tuning and maintenance: this part does not directly alter primary flight characteristics, but correct fitment affects autorotation feel and tail responsiveness. Check tail tracking and rotor free-play after replacement as part of routine setup.