Hirobo HI0404640 Counter Gear Case for Pipe Drive, helicopter common replacement part  [HI0404640]

Counter Gear Case for Pipe Drive

This counter gear case is an RC-scale replacement part intended for pipe drive tail systems. It serves as the housing that positions the counter gear relative to the pipe drive assembly, and is described here as a common replacement part for relevant Hirobo helicopter lines.

Fit and role: the case locates the counter gear and helps maintain gear mesh alignment during tail drive operation, which supports routine repairs and tuning of the tail section. Use it when servicing the pipe drive assembly, replacing worn housings, or restoring correct gear positioning after component changes.

Installation notes: remove the affected tail housing following your model's standard disassembly steps, transfer or replace internal gearing as required, and secure the new case with the original fasteners. Verify gear mesh and free-play with the main and tail drive systems before full reassembly and flight testing. This description assumes familiarity with RC helicopter maintenance practices and does not alter model-specific service procedures.