John Deere produced its 820 farm tractor model From 1956 Until 1958 in United states with a Open operator station cabin and more than 7,080 units were build. Talking dimensions and weight, this model weighs 7,850 lbs or 3560 kg has 79.5 inches [201 cm] of width, 142.75 inches [362 cm] of length and 81 inches [205 cm] of height while maintaining a wheelbase of 85.25 inches [216 cm] the front tread is about 56.5 to 63 inches while the rear tread is 64.5/68.5 inches . This tractor can fit ag tires of 7.50-18 front and 7.50-18 back . This John Deere 820 is powerd by a diesel engine it has 470.7 ci or 7.7 L 2 cylinders the fuel tank capacity is 32.5 gal or 123.0 L. This machine has 4x2 2WD wheel drive system,6 forward and 1 reverse transmission system.