The ZAXIS-3 series has realized increased productivity and greater fuel efficiency with a combination of a new hydraulic system and new engine. We achieved our primary goal, which was to develop a world-class machine with leading environmental performance.
![[Image] Kouji Tahara, General Manager, Development Design Center, Construction Equipment Division, Business Management Group, Hitachi Construction Machinery](/environment/showcase/speco_technique/zaxis/images/img_03-01.jpg)
Kouji Tahara, General Manager, Development Design Center, Construction Equipment Division, Business Management Group, Hitachi Construction Machinery
How is the new and greatly improved ZAXIS being received by users?
Of all the Hitachi offerings, our construction machinery products are the best known by our customers worldwide. Non-users may still be familiar with our landmine removal machine, which is an improved version of the hydraulic excavator.
Thankfully, ever since its launch in February 2006, the ZAXIS-3 series has grown significantly and has been shipped throughout Japan as well as to over 40 countries around the world.
What was the development target for the ZAXIS-3 series?
Prior to developing the new series, we conducted an extensive customer survey both domestically and around the globe. The engineer responsible for design flew directly to see the customers to find out how hydraulic excavators were actually used at construction sites, how they rated the performance and ease of use. We dedicated approximately two years conducting thorough research and collecting information.
![[Image] Mr. Tahara is talking](/environment/showcase/speco_technique/zaxis/images/img_03-02.jpg)
In fact, our survey revealed that in emerging countries where social infrastructure is still weak, hydraulic excavators that can handle greater workloads are in high demand. On the other hand, in countries like Japan and Europe, work efficiency and fuel efficiency turned out to be the key priority.
As a result, we identified both regional differences as well as common problems, and decided to focus on the 'improvement of basic performance' in excavation work.
What do you mean by 'improvement of basic performance'?
Simply put, it means to realize both increased productivity and lower fuel consumption. To achieve this, we reviewed all aspects of the existing machines, and developed various environmental technologies to provide both greater productivity and lower fuel consumption, from increased engine horsepower and improved durability to ease of operation and speedy excavation.
Was 'consideration for the environment' another major theme?
In order to achieve enhanced productivity and lower fuel consumption at the same time, engine rotation, engine torque and hydraulic pressure had to be efficiently controlled. In order to maximize the performance of each of these components, the hydraulic system and engine was significantly revamped.
Was 'consideration for the environment' another major theme?
![[Image] Mr. Tahara talks in a hydraulic excavator](/environment/showcase/speco_technique/zaxis/images/img_03-03.jpg)
Yes. The engine was developed jointly with the engine manufacturers including state-of-the-art environmental technologies such as the 'Cooled EGR* system'. This system cools down exhaust gases and mixes them with the intake air for re-combustion. This makes it possible to maintain high-energy output and at the same time reduce NOx (nitrogen oxide), a major source of air pollution.
Additionally, we developed a proprietary technology for the hydraulic system from an 'eco' standpoint to utilize the energy of hydraulic pressure to the best extent in an efficient manner, and realized greater arm speed.
*EGR: Exhaust Gas Recirculation
Were Aluminum materials are also used?
Yes, the engine cooler is made of aluminum. Air-conditioner condensers, are also made of aluminum materials, which are easily recyclable.
Previously, we used lead solder for the radiator, but no longer do. Now, the electronic substrates for the controller, radio, etc. are completely lead-free, which shows that we are closely watching the trends in Europe (EU) where the use of toxic chemical substances is strictly controlled.
![[Image] Engine cooler made from aluminum](/environment/showcase/speco_technique/zaxis/images/img_03-04.jpg)
What do you think was the most challenging aspect during the development process?
The most difficult part was to perfectly meet all the numerical targets for basic performance. Actually, we struggled to achieve the targets.
![[Image] Mr. Tahara is talking](/environment/showcase/speco_technique/zaxis/images/img_03-05.jpg)
For example, it was a very complicated process to adjust the engine output and hydraulic pressure control. We ran a number of trials, and finally identified the best balance for maximizing the performance of the hydraulic excavator.
It was also challenging to ensure that the products were well balanced in terms of safety, durability and reliability, as construction machinery. Other challenges included developing a more advanced electronic control system as well as a more robust underbody. It took us a total of four years to tackle one challenge at a time until we finally launched the new series in 2006.
Is it true that the product development group underwent a major restructuring?
Yes, previously, products with local specifications were designed locally and country by country. However, this practice was changed when developing and designing the ZAXIS-3 series. Tsuchiura Works is now positioned as the 'Mother Design Factory' of the world, where all design work is performed. Major parts are shipped from Japan to other parts of the world.
![[Image] From Japan to the world Tsuchiura Works, the mother design factory of the world](/environment/showcase/speco_technique/zaxis/images/img_03-06.jpg)
Is it true that the product development group underwent a major restructuring?
![[Image] Tsuchiura Works, the mother design factory of the world](/environment/showcase/speco_technique/zaxis/images/img_03-07.gif)
Currently in the Tsuchiura Works, we are using a satellite communication system to collect and analyze information about all the machines operating around the world. In fact, we are monitoring their conditions on a real-time basis. This enables us to foresee when maintenance for a specific machine is likely to be required, and allows us to provide a better proactive maintenance service by alerting the customer beforehand. This has brought our engineers much closer to the customers.
![[Image] Kouji Tahara, General Manager, Development Design Center, Construction Equipment Division, Business Management Group, Hitachi Construction Machinery](/environment/showcase/speco_technique/zaxis/images/img_03-08.jpg)
We will continue to strive to develop new technologies in order to establish even stronger trustful relationships with our customers. Our primary goal to further drive the environmental performance of hydraulic excavators will be achieved through cutting-edge technological innovations.
