The Challenger MT645D is a row-crop tractor produced from 2011 to 2013 as part of the MT600D Series by Challenger, a part of AGCO. It features a powerful AGCO Power 8.4L 6-cylinder turbocharged air-to-air intercooled diesel engine with 240 hp gross power and a Techstar CVT continuously variable transmission. The tractor includes advanced mechanical features such as four-wheel drive, inboard planetary final drives, electro-hydraulic differential lock, hydrostatic power steering, and hydraulic wet disc brakes. It offers a spacious cab with air-conditioning and optional hydraulic suspension and AGCOMMAND system. The MT645D has a fuel capacity of 167 gallons and a hydraulic system capacity of 29.1 gallons with closed center load sensing hydraulics. It supports a rear hitch type III with a lift capacity of 22,760 lbs and optional front hitch. The PTO is independent with electro-hydraulic clutch and multiple speed options. Dimensions include a 122-inch wheelbase, 215.7-inch length, and 141-inch cab height, with standard agricultural tires sized 480/70R34 front and 520/85R46 rear. Electrical system features a 240 amp alternator and two 12-volt batteries. The MT645D was built in Jackson, Minnesota, USA, and originally priced at $263,455 in 2013.