The Challenger MT645E is a row-crop tractor produced from 2014 to 2020 as part of the MT600E Series. Manufactured by Challenger, a part of AGCO, and built in Jackson, Minnesota, USA, it features a powerful AGCO POWER 8.4L 6-cylinder turbocharged diesel engine with 240 hp rated power and a maximum of 270 hp. The tractor is equipped with a Techstar continuously variable transmission (CVT) offering infinite forward and reverse speeds. It includes four-wheel drive, electro-hydraulic differential lock, hydrostatic power steering, and hydraulic wet disc brakes. The cab is standard with air-conditioning and optional hydraulic suspension. Hydraulics are closed center load sensing with 2900 psi pressure and 54 gpm pump flow. The tractor hitch supports category III/IVN with a rear lift capacity of 26455 lbs. The rear PTO is independent with 1000/1000E type. Dimensions include a 122-inch wheelbase, 218.6-inch length, and 141-inch cab height, with a shipping weight of 23810 lbs. Electrical system features a 12-volt negative ground with a 240 amp charging system. Similar models include the Massey Ferguson 8727 and related models MT645D and MT655E.