International Harvester 644

The International Harvester 644 is a row-crop tractor produced from 1974 to 1980. Built in Neuss, Germany, it features a 3.4L 4-cylinder liquid-cooled diesel engine producing 60 hp (44.7 kW). It offers an 8-speed transmission with 8 forward and 4 reverse gears, two- or four-wheel drive options, and manual steering. The tractor has an open operator station and a rear Type II hitch with a lift capacity of 6394 lbs (2900 kg). It includes a hydraulic pump flow of 7.9 gpm (29.9 lpm) and a rear PTO with 540/1000 rpm options. Dimensions include a wheelbase of 87.8 inches (223 cm), length of 148.8 inches (377 cm), and height of 98 inches (248 cm). Weight ranges from 6350 lbs (2880 kg) for 2WD to 7078 lbs (3210 kg) for 4WD. Tire sizes are 7.50-16 or 9.5-24 (MFWD) front and 16.9-30 rear. Electrical system is 12 volts with negative ground.