Liberalization of trade brought Japan demand from abroad and the opportunity to raise Japan's technological advancements to a world-class level. The introduction of large-scale power sources took place, which accelerated development of larger equipment.
The Hydraulic excavator was first developed by a French company, Poclain. In Japan, Mitsubishi Heavy Industries partnered with another French company, SICAM, and began domestic production in 1961.The name of SICAM's hydraulic shovel was "Yumbo", and that is how Yumbo became a nickname for the Hydraulic excavator.
The 15H was based on a design by Bucyrus who was already working with Komatsu on mechanical excavator, and it was equipped with an engine and hydraulic components that were made in Japan. It was the first Hydraulic excavator in the Komatsu line.
Weight: 11400kg, Bucket capacity: 0.4m3
Since its first emergence in 1951, it took only 50 years for the hydraulic shovel to establish its primary position on construction sites worldwide. Its size ranges from mini to super size depending on the scale of construction, and during the half century, it kept evolving by achieving a minimum rear-swing radius and adapting styles that would work with characteristics of each site. Mirroring the movement of a human hand, a hydraulic shovel will continue to evolve during the 21st century.