The Ares 500 and 600 series were updated in 2002, but small changes were also made when the Ares models were renamed Claas in the autumn of 2003. The most significant change was the arrangement of the 6-cylinder models: the 616 was now equipped with a turbo, and the 626 and 636 were replaced by the 656, which had power between the two (125 hp). There were also minor changes in the power and torque figures of other models due to emissions regulations. On the smaller end of the range, the basic transmission option was a 24+24-speed gearbox with only a 2-speed splitter. However, the previous 32+32 gearbox with a 4-speed splitter was still standard equipment in most countries. The fuel tanks of the 6-cylinder models were larger than before. The base model's hydraulic output was now 95 l/min. The four-wheel drive versions featured a Carraro front axle.

Three equipment levels were available: Profi, Comfort, and Premium. Even the Comfort version included cab suspension and air conditioning. The Premium version featured, among other things, automatic splitter shifting, a closed hydraulic system (110 l/min), rim wheels, and an onboard computer. The difference between German and French cultures is reflected in the fact that turning circle diameters were now given as larger than before, and lifting capacities were stated as achieved throughout the lifting range instead of just the previous peak value.

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