John Deere produced its 850 farm tractor model From 1978 Until 1989 in United states with a Two-post ROPS cabin. Talking dimensions and weight, this model weighs 2400 lbs or 1088 kg has 53.3 inches [135 cm] of width, 117.7 inches [298 cm] of length while maintaining a wheelbase of 64 inches [162 cm] and a ground clearance of 13.7 inches [34 cm] the front tread is about 42 to 58 inches while the rear tread is 42 to 50 inches . This tractor can fit ag tires of 5.00-15 front and 5.00-15 back or lawn tires of 23/8.5-12 front and 23/8.5-12 back . This John Deere 850 is powerd by a diesel engine it has 78 ci or 1.3 L 3 cylinders ,it can produce 25 hp or 18.6 kW at 2600 (rpm), the fuel tank capacity is 8.5 gal or 32.2 L. This machine has 4x2 2WD wheel drive system,8 forward and 2 reverse transmission system.