Replacement Counter Gear Case for Pipe Drive — Hirobo HI0404640  [HI0404640]

Pipe Drive Housing Replacement Details

This counter gear case is an aftermarket service part made for pipe drive tail systems, acting as the housing that locates the counter gear relative to the drive tube. It is presented here as a common replacement option for various Hirobo helicopter lines.

Fit and role: the case secures the counter gear and supports correct gear mesh under operating loads, which contributes to steady tail drive performance and straightforward repair work. Use it when a housing shows wear or when gear alignment needs restoration.

Installation notes: remove the tail housing following normal maintenance steps, swap or reinstall the internal gears as required, and fasten the new case using the original screws. After refit, check gear engagement, free-play and tail rotation before flying.