Hitachi Construction Machinery


The Tsuchiura Works is an integration of advanced production technologies. Take a look at our well-developed manufacturing process.

3D-CAD (3-Dimensional Computer-aided Design System)

Our design centers use a 3-Dimensional Computer-aided Design System (3D-CAD) and share 3D-CAD data with related sections. This allows us to shorten development lead time, and also to standardize and automate parts design. In addition, the sytem enables dynamic computation of booms and arms, and simulation of drive mechanisms at the same time. This contributes to improved productivity and stable product quality.



Structural welding is carried out by highly advanced welding robots developed by HCM with welding technology that has attracted worldwide attention. HCM has supplied such welding robots to its partner companies abroad, where they are playing a major role in improving productivity and product reliability.

Machine Processing (Kasumigaura Works and Hitachinaka Works)

The Kasumigaura Works and Hitachinaka Works process and assemble numerous machine parts. At the Kasumigaura Works, every stage of the plant’s production, from materials provision to finishing, is computer operated and controlled. An FMS line enables unmanned machining of a wide range of components, and a rationalized inventory management system featuring unmanned guided vehicles links various kinds of numerically controlled machine tools with an automated storeroom. The interweaving of these systems into a synergistic whole has enabled streamlined, fully integrated production processes and greatly improved labor-savings and efficiency. The Hitachinaka Works processes and assembles machine parts of large construction equipment, including large and ultra-large hydraulic excavators and dump trucks for mining, via various kinds of machine tools and FMS line.

Assembly (Tsuchiura Works and Hitachinaka-Rinko Works)

This assembly line is for hydraulic excavators and wheel excavators. At the Tsuchiura Works, excavators of various kinds ranging from 10-ton to 40-ton models are produced on a single-line, mixed-flow basis in accordance with our customers’ needs. This assembly line incorporates various features for improving productivity and product reliability and uses a conveyor to advance machines through the assembly process. At the Hitachinaka-Rinko Works, large and ultra-large excavators with operating weights of over 45 tons, as well as mining dump trucks with nominal payloads of over 170 tons are produced.

Inspection and Testing

While incorporating quality measures into every production process as a matter of course, for welded areas HCM ensures the best possible quality through double and triple checks and by conducting inspections using automated ultrasonic inspection devices. In the final stages of production, each and every machine is test-operated, and only those which pass this rigorous test procedure are sent on to the coating line.


Each individual part of medium-sized hydraulic excavators is coated with a finish before assembly. The process is controlled via an integrated line from the base coat to finishing coat and automated through robots and other methods. To enhance rust prevention, thin plate components use cationic electrodeposition coating while thick plate components employ shot-blast processing. The photo shows a finishing coat being applied to a front part using robots.

To the Global Market

To improve our capacity to meet users’ diversifying needs promptly, HCM maintains a company-wide information network and production system directly linked to information provided by customers themselves.

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