Hirobo HI0404513 Autorotation and Tail Drive Shaft for SX Series  [HI0404513]

Replacement Shaft Details for SX Series

HI0404513 is the replacement auto-rotation drive shaft for Hirobo SX series helicopters and is used to transmit torque between the autorotation assembly and the tail drive linkage in RC models.

Fitment and role: the component connects autorotation mechanics with the tail drive train and operates with the gearbox and tail assembly. Confirm spline engagement and bearing condition during replacement to preserve smooth torque transfer.

Installation notes: power down and brace the airframe before beginning work. Fit the shaft squarely into its bearings, check for any binding through the movement arc, and use recommended fasteners without over-torquing.

Tuning and maintenance: proper installation affects autorotation feel and tail responsiveness even though the part alone does not change core flight dynamics. As part of setup, inspect rotor free-play and tail alignment after fitting.