Wirtgen’s Tier IV interim-compliant W 250i offers high rates of productivity, maximum cost efficiency and fuel-efficient i-machine technology. This large cold mill can remove asphalt layers with a milling depth of up to 14 in. (35.5 cm), and cut portland cement concrete surfaces at a high advance rate.
This is possible due to its muscular power plant, matched with WIDRIVE intelligent machine management system, three selectable milling drum speeds, and dual engine concept, which keeps operating costs exceptionally low for a cold milling machine in this performance class, according to the manufacturer.
The dual engines of the W 250i — also seen on the W 210i — makes virtually two machines in one: a high-performance milling machine with the full power of two engines totaling 990 hp, and a cost-efficient mill with a single engine at 599 hp to economically remove softer asphalt surface courses or porous asphalt, for example.
The machine operator can set the optimum drum speed for any job from the operator’s platform via a selector switch, allowing him to adapt immediately to changing conditions.
For standard milling jobs, such as the removal of a surface course, the W 250i can operate with the medium milling drum speed of 1,800 rpm, which produces reclaimed asphalt pavement (RAP) at preferred aggregate sizes. When removing thin surfaces at the maximum advance rate, the high milling drum speed of 2,000 rpm may be selected, producing a superior milling texture. And for maximum productivity at lowest cost, the slowest speed of 1,600 rpm is the right choice for reduced fuel consumption and low cutting tool wear.
The W 250i’s standard cutting width is 7 ft. 3 in. (2.2 m), but this can be extended with additional drum units for working widths of 8 ft. 2 in., 10 ft. 2 in., 11 ft. 6 in., 12 ft. 6 in., and 14 ft. 5 in. (2.5, 3.1, 3.5, 3.8 and 4.4 m). The optional FCS Light quick-change system for milling drums permits a variety of different milling operations via different milling drums.
At the operator’s platform, a multifunctional control display serves as a practical information hub. It can be swung to the left or right of the operator, together with the level pro control panel, and displays operating status and service data.
The control display provides user-friendly diagnostic options with clear graphics for identifying the source of any problem. Another handy function is the logging of job data at the end of the day, showing how many trucks have been loaded and the overall tonnage achieved.
Wirtgen’s WIDRIVE machine management system handles many tasks for the operator in automatic process chains, making it easy to learn how to operate and control the W 250i. An optional camera system with two or six cameras also is available to monitor up to six working areas on the control display.
The optional parallel-to-surface (PTS) system automatically aligns the W 250i parallel to the road surface, ensuring simple, accurate operation of the machine in demanding profiling jobs. PTS also assists the operator in positioning the machine in the milled cut to initiate the milling process. In automatic mode, the system takes care of all the steps that the operator would otherwise need to select manually, one after another.
The operator activates the level pro level control system at the flick of a switch, and all four crawler track units of the large milling machine are lowered simultaneously at high speed. When the milling drum unit reaches the surface to be milled, the lowering speed is reduced and the milling drum slowly penetrates the material down to the set depth. The automatic process helps to prevent excessive cutting tool wear or even tool failure when milling starts.
The same applies when the W 250i is aligned transverse to the direction of travel. In many cases, cold milling machines need to overcome significant differences in height when being moved into or out of the milled cut. The integrated four-fold, full-floating axle balances out all four track units quickly and reliably to reduce the machine’s lateral inclination to a minimum. This lends a high degree of stability to the large milling machine while the operator moves forward normally, according to the manufacturer.
The W 250i’s intelligent speed control (ISC) system prevents crawler track slip and ensures perfect traction of all track units to achieve maximum milling performance. This, in turn, reduces track pad wear. When negotiating bends, the ISC system automatically increases the speed of the outer crawler tracks depending on the steering angle. As a result, even extremely narrow bends can be milled using the all-track drive.
An optional vacuum cutting system (VCS) to reduce particulate emissions at the cutter head is available.
For more information, call 615/501-0600 or visit www.wirtgenamerica.com.
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