The new generation Challenger MT700 series models were introduced in 2001, and at the same time, Caterpillar sold the Challenger production to Agco. Caterpillar continued to supply, among other things, engines and powertrains to Agco. The new MT800 series models, which were developed already during Caterpillar’s time, featured four-valve engines with significantly more power than their predecessors. The engine displacements were 12.0, 14.6, and 15.8 liters. Pump injectors were used in the fuel injection system. The emission standard was EPA Tier II.

The Powershift transmission was new, with 16+4 speeds, and the road speed increased to 40 km/h. The wheelbase grew from 229 cm to 300 cm, and these models also now had steplessly adjustable track width. The tracks featured a new Opti-Ride suspension. Track widths were available from 457 to 914 mm. The hydraulic pump output was 233 l/min, and there were 4 to 6 electrohydraulic valves. A TMC display (Tractor Management Center) was installed in the cab for control of functions and the onboard computer. The cab was the same as in the smaller MT700 series.

At the same time, Agco introduced smaller models made by Iseki and Massey Ferguson to the Challenger range. The MT400 series corresponded to the MF 4200 series, and the MT500 and MT600 series equivalents were found in the 6200 and 8200 series.

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