Hirobo HI0404513 Auto-Rotation Drive Shaft for SX series  [HI0404513]

Auto-Rotation Drive Shaft for SX Series

This drive shaft is the replacement auto-rotation component listed as HI0404513 for Hirobo SX series helicopters. It is intended as an RC-scale part that transmits rotational motion needed for autorotation function and tail drive linkage on compatible SX models.

Fitment and role: the shaft links autorotation mechanics with the helicopter's tail drive path and works alongside the existing gearbox and tail assembly. Check alignment, mating splines, and surrounding bearings when swapping components to maintain smooth rotation and reliable tail response.

Installation notes: remove power and support the airframe before service, inspect adjacent parts for wear, fit the shaft straight into its bearings and confirm there is no binding across the range of motion. Use manufacturer-recommended fasteners and avoid over-tightening which can induce premature wear.

Tuning and maintenance: while this part does not change primary flight characteristics by itself, correct installation affects autorotation feel and tail responsiveness, so verify tail track and rotor free-play after replacement as part of routine setup.