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Maximum Performance and Productivity with the W 250 XF Large Milling Machine
The engine power output of the new large milling machine has been increased by more than 20% compared to its predecessor. The ACTIVE DUAL POWER dual-engine drive makes the milling machine even more powerful and versatile in use. The two 18-l John Deere diesel engines can deliver a combined peak power output of 900 kW. Wirtgen and John Deere worked in close collaboration on the fine tuning of the torque characteristic of the engines to meet the specific needs of the cold milling process. Both engines deliver high torque at low engine speeds. The improved torque characteristic guarantees lower fuel consumption and fast, productive work, even at the machine’s maximum milling depth. The integrated MILL ASSIST machine control system regulates the power output of the 2 engines according to demand to ensure the most efficient use of the machine. In automatic mode, it always ensures the most favorable working balance between performance and costs. It also allows the selection of 3 different working strategies that optimize the process with regard to costs, performance, or quality. The W 250 XF demonstrates its full potential especially in “performance-optimized” mode. There is a choice of 3 different engine power combination modes that can be selected to meet the requirements of specific milling tasks. For example, only one engine is used when removing concrete or brittle materials. When the task demands the removal of a surface layer and high surface quality, the second engine is cut in and operates in the part load range. In combination mode #3, both engines operate synchronously and deliver the maximum combined power output. As both engines are generally operated within the low speed range, their fuel consumption is correspondingly low. The large milling machine impresses with high daily output rates in applications on freeways, federal highways, airports, and other major construction projects. Flexibility is one of the most critical requirements in day-to-day operations on construction sites. The milling drum of the W 250 XF can be exchanged for a Multiple Cutting System (MCS) milling drum within minutes. The ability to rapidly change to application-specific milling drums with different tool spacings considerably increases machine productivity. At the same time, the choice of the ideal drum for a specific application also reduces wear-related costs. Wirtgen offers a range of milling drums for the W 250 XF that meet the requirements of any milling application. Exchanging the milling drum assembly enables the realization of milling widths from 2.2 m to 3.8 m. With the aid of the quick-change system, the entire milling drum assembly can be changed in less than one hour. In addition to machine control with MILL ASSIST, the automated documentation of milling tasks with Wirtgen Group Performance Tracker Milling, or WPT Milling for short, also plays a major role. Maximum efficiency is achieved by the combination of both of these digital solutions. The operator is kept constantly informed about the current machine and job parameters, and when the work has been completed, the data are transmitted to the machine owner, who can then use them for fast and precise billing. In addition to displaying construction site and machine data, the automated documentation also shows the CO2 emissions for the entire construction site. The John Deere Operations Center™ presents all information in real time. The LEVEL PRO ACTIVE leveling system was developed by Wirtgen specifically for cold milling machines. Clearly readable control panels provide information and measured values from all currently connected sensors and ease the machine operator’s workload. The system is fully integrated in the control system of the cold milling machine and, as essential machine functions are directly interconnected, enables a high level of automation and precise milling results. The system also offers numerous automatic and additional functions that make the machine operator’s job easier, for instance, automatic lifting for driving over manhole covers.
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