Hitachi Rolls Out Grade Control Technology Options for Select Excavators Hitachi grade management technology is available on the ZX210-6, ZX210LC-6 and ZX350LC-6 excavators in the US and Canada. May 4, 2021 With Hitachi Solution Linkage 3D Grade Control, the machine controls the boom and bucket as the operator handles the arm. Hitachi Construction & Mining Division, an operating division of John Deere Construction & Forestry Company, rolled out options for grade control technology on select excavators, including 2D Grade Control and Solution Linkage 3D Grade Control, which allow an operator to set a grade and hold it. The new factory-integrated technology increases efficiency while also lowering daily operating costs by enabling operators to spend less time getting the grade right the first time.