Hydraulic Excavator UH03

The Model UH03 is a pure domestic hydraulic excavator produced for the first time in Japan and was developed by Hitachi, Ltd. (currently Hitachi Construction Machinery Co., Ltd.). Before that, the single-pump type produced through technical cooperation with European countries had been the mainstream. Hitachi developed a two-pump, two-valve system unique to Japan, which enabled combined actions of lifting and turning a boom, thereby drastically improving the workability.

The system was adopted subsequently by many manufacturers. In this sense, the machine is a heritage that can be situated at the origin of the development of today’s hydraulic excavators.