In the autumn of 2003, the 500 series Lexion models were introduced. The lineup had jumped up a notch, so for example the previous 420 was succeeded by the 510 in terms of engine power and grain tank capacity. For hillside harvesting, Montana sidehill models were available, and the 560 could also be ordered in a Terra-Trac tracked version. All models came standard with a straw conditioner. A high-capacity forage chopper was also offered. The engagement of the header drive had been softened. On models equipped with the straw walker, the tailboard now deflected downward under overload conditions even on the smaller machines. The six-walker models featured a more powerful tank unloading system.

As with the preceding Evolution series, the engines were made by Caterpillar. In the 560, there was a new 10.3-liter, 360-horsepower engine with common-rail injection. For 2006, most models received updated engines, and the outputs of the larger machines were increased slightly. At the same time, the forage choppers were made more powerful.

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