GPH 346 Compatible Tail Gear Box HI0403251 Hirobo  [HI0403251]

Replacement tail gearbox notes for GPH 346

Hirobo HI0403251 is offered as a replacement tail gear box for the GPH 346 model helicopter. The passage below outlines the part's function in the tail drive, its intended fitment with GPH 346 models, and practical advice for inspection and reassembly.

The unit positions and supports tail gears within the boom area and transmits rotational motion toward the tail rotor. As a replacement part for RC use, it helps re-establish proper gear engagement when the original gearbox is compromised by wear or damage.

Before fitting: verify the HI0403251 reference against your helicopter's parts listing, inspect mating gears and bearings for signs of wear, and re-check alignment and mesh after refitting. Avoid assuming compatibility with other airframes unless Hirobo lists them as compatible.

Effect on handling: a correctly installed tail gear box reduces slack in the tail drive and aids consistent tail authority, which in turn supports dependable yaw control and smoother handling for the GPH 346.