In the fall of 2017, Challenger introduced the MT700 series, designed together with Fendt. Fendt brought a corresponding tracked tractor to the European market as the 900 Vario MT series. The engine was a 7-cylinder, 9.8-liter Agco Power unit. It featured two turbos and utilized all known technology for exhaust gas purification. The engine’s nominal speed was only 1700 rpm, with maximum torque achieved in the range of 1200–1600 rpm. The cooling fan had a Voith hydrostatically driven system.

The transmission was Fendt’s ML400, known as Accu-VT in Challenger terminology. The drivetrain included two hydrostats, one of which was disengaged at speeds over 20 km/h. The top speed of 40 km/h was reached at 1550 rpm. The lifting capacity was smaller on the Challenger compared to the corresponding Fendt model. For hydraulics, two 220 l/min variable displacement pumps were optionally available if needed.

Compared to previous Challengers, the suspension of the track system was improved: there were coil springs between the track system and the tractor, and additionally the carrier rollers within the track system were suspended. As an extra option, the cab was also coil-sprung. The cab was mostly the same as Fendt’s 1000 series Vario, and the display was a 10.4″ AccuTerminal. The wheelbase was 13 cm longer than in the earlier Challenger model.

Sales of Challenger tractors ended in 2023, and Agco focused on the Fendt brand also in North America.

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