The Claas Lexion 660 combine harvester is the second-largest model in the Lexion 600 series. Since 2013, it has featured the Caterpillar C 9.3, the in-line 6-cylinder, 9,3 l engine which provides a 239 k/W (325 HP) rated output. This Caterpillar engine enables the Claas Lexion 660 combine harvester to meet the Tier 4i standard. Its working width is between 6.6 and 7.5 m. Prior to the threshing, the ABS system accelerates the crop, thus ensuring a more even distribution. The residual grain separation takes place via six shaker trays with a separation area of 9.85 m2. The cleaning is via a 6-speed turbine with electric blower adjustment. The 3D cleaning which ensures optimum distribution on the upper sieve, is unfortunately not standard on the Claas Lexion 660 combine harvesters. The grain tank for this series has a capacity of 10.000 l and can be extended to 11.000 l, with a discharge capacity of 110 l/s. The Claas Lexion 660 combine harvesters also make use of the proven Special Cut II chopper. It is equipped with either 88 or 64 closely-spaced knives, which are sanded on both sides. The Claas Lexion 660 combine harvester is also available as a 30 km/h version, which shortens the travel time between the work segments, thus enabling more efficient work. The Cebis board system allows the driver to monitor the harvesting operations and makes it convenient to change settings from the air-conditioned cab. Even if the work just keeps on coming, the Claas Lexion 660 combine harvester is well prepared. With up to 10 work lamps, it can work well even at night.