After the war, larger construction equipment was needed in order to reconstruct and cultivate devastated farmlands. At this point, Japan was developing equipment imitating what the U.S. army had brought in.
From the 1950's, hydraulic Motor graders started appearing in the United States and Europe. As Komatsu was already developing forklifts and Dump trucks with hydraulic components, we decided to change the power transmission of the graders from mechanical format with a shaft and cogwheel to hydraulic format with a hydraulic pump and hydraulic motor cylinder.
This was the first domestic hydraulic Motor grader.
Around this time, the demand for construction equipment rose dramatically as the amount of construction work increased rapidly with Japan's economic growth. It had been said that operating Motor graders was difficult due to their multi functionalities however, with the emergence of the hydraulic grader, operation was simplified and less stressful so that even inexperienced workers were able to operate them properly.
There were other construction machines built by Komatsu over the years. We can see how the various designs mirrored different eras if we look at them set against the flow of history.