Hirobo HI0404640 Pipe Drive Counter Gear Case for Helicopter Tail  [HI0404640]

Counter Gear Case Specifications and Use

This counter gear case is a replacement item intended for pipe drive tail systems, forming the housing that locates the counter gear in relation to the pipe drive assembly. It is described as a common service part for the applicable Hirobo helicopter series.

Fit and role: by maintaining the counter gear location the case helps ensure proper gear mesh alignment during operation, supporting fine-tuning and repair of the tail drive components. Employ this part when correcting alignment after component changes or when replacing failing housings.

Installation notes: disassemble the tail housing per your model's service instructions, fit or transfer internal gearing as necessary, and secure the new case with the existing fasteners. Validate gear mesh and free-play with the main and tail drives, then conduct conservative hover testing to confirm behaviour.