WITH the W 200 and W 210, Wirtgen says it has introduced two truly efficient models in the large milling machine range, broadening its portfolio to a total of 17 cold milling machines.

With their entirely new design, the machines incorporate many innovative features in terms of milling performance and milling job, enabling them to be adjusted to the required application with greater flexibility than ever before, says a spokesman for the German company.
For the machine user, this concept results in tremendous cost savings and thus a favourable total operating cost balance, he adds.
Both large milling machines are available with a standard milling width of 2 m, but can optionally be fitted with a 1.5-m or even 2.2-m-wide milling drum. The tried-and-tested FCS Light quick-change system for drums enables the machines to carry out a wide variety of different milling jobs as various milling drums can be used. Both machines feature a maximum milling depth of 33 cm.
The large machines can be used for extensive surface course rehabilitation, the selective removal of pavement layers, and fine milling jobs using drums with different tool spacings.

“As a high-performance machine, the W 210 is equipped with a particularly strong engine offering an output of 671 hp (500 kW). Its relatively low operating weight of 28,100 kg ensures ease of transport,” the spokesman explains. “The W 200 is equipped with a 550 hp (410 kW) engine. Its weight of 27,100 kg makes transport just as easy, and enables the very compact large milling machine to work with maximum efficiency – whatever the milling job.”

Dual-engine design
The spokesman continues: “The W 210 drive design is an innovation unprecedented in cold milling machine technology. The use of two diesel engines results in the unique advantage of the operator being able to utilise the engine power selectively depending on the specific job requirements. Machine users will thus benefit significantly from a fuel cost reduction by up to 25 per cent compared to conventional drive technology. At the construction site, while the large milling machine requires the maximum possible engine power to work at a milling depth of 30 cm, for other jobs high area performance is called for at a low milling depth of only 4 cm. In such cases, the total power of 671 hp provided by the two engines is unleashed for the large milling depth whereas the operation of one engine is sufficient when working at a depth of only 4 cm. The second engine can be switched on and off as required. If the second engine is added on, it automatically runs in the speed range of the first engine.
“This drive design is also truly environment-friendly. Using only one engine in less demanding conditions will result in correspondingly lower exhaust and noise emissions, which protects both the machine operator and the environment.”

Applications
These large milling machines offer additional features to further optimise diesel fuel consumption, milling performance and overall efficiency in accordance with the job at hand. The operator may select three engine speeds: 1,600 min-1, 1,800 min-1 or 2,050 min-1. The lowest engine speed is selected to work at maximum power while keeping tool wear and fuel consumption to a minimum. The 1,800 min-1 speed ensures optimal area performance and a smooth surface texture in surface course milling applications. The speed of 2,050 min-1 should be selected for fine milling applications to achieve the highest possible advance rate. In these jobs, the machine can easily work at speeds exceeding 30 m/min while guaranteeing a high-quality texture of the milled surface, the spokesman says.

Ergonomic standards
The operator’s platform including controls is an entirely new development and impresses with adjustment options perfectly tailored to the operator’s everyday needs. The height-adjustable seat can be moved beyond the zero-clearance side on a swivel arm. The slender ‘wasp waist’ design on both sides opens up completely new horizons in terms of milling edge and crawler track visibility. The number of switches on the control panels has been reduced to a minimum, and their features are labelled in a language-neutral manner, enabling the operator to handle the machine skilfully and with great ease.
The W 200 and W 210 machines increase operator comfort even further by featuring a fully anti-vibration mounted operator’s platform that significantly reduces the degree of vibration occurring on the platform. A new canopy design enables the operator to move the canopy to both sides complete with front and rear screens in order to safely negotiate any trees or traffic signs.

Automatic alignment
The new PTS (parallel-to-surface) system automatically aligns the large milling machines parallel to the road surface, ensuring simple, accurate operation in high-quality milling jobs. PTS also assists the operator by 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 can activate the Wirtgen Level Pro 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 assembly 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 contributes to preventing excessive cutting tool wear or even failure when commencing the milling operation.
The same applies to the alignment of the large milling machines transverse to the direction of travel. In many cases, the 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 ensuring operator comfort.

Intelligent travel drive control
“The ISC (intelligent speed control) 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 driving through 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. Automatic adjustment of the advance rate to the diesel engine load ensures maximum performance, yet quiet operation of the machine,” the spokesman says.