GPH 346 Tail Gear Box Replacement for GPH 346 - Hirobo HI0403251  [HI0403251]

GPH 346 tail gearbox overview

This replacement tail gear box is identified by Hirobo HI0403251 and is intended for use with GPH 346 scale RC helicopters. The description highlights the part's role within the tail drive and its fitment for the GPH 346 family of airframes, plus practical notes for installation and adjustment on model helicopters.

The component functions as the tail gearbox assembly element that positions and supports the tail gears inside the tail boom, transferring rotational motion toward the tail rotor. As an RC-scale accessory, it is designed to restore correct gear engagement when an original tail gear box shows wear or damage.

Installation guidance: always confirm the HI0403251 part number against your airframe parts list before fitting, inspect mating gears and bearings for wear at the same time, and re-check gear mesh and alignment after reassembly. Do not assume interchangeability with other models unless Hirobo explicitly lists compatibility.

Tuning impact: a properly installed tail gear box reduces play in the tail drive and helps preserve tail authority, supporting more predictable yaw control and smoother flight behaviour on the GPH 346 platform.