The International Harvester 1566 is a row-crop tractor produced from 1974 to 1976 as part of the 66 Series. Built in Rock Island, Illinois, USA, a total of 7,417 units were made. It features a turbocharged 7.1L 6-cylinder diesel engine producing 183 hp, with a 12-speed two-speed power shift transmission. The tractor has a two-wheel drive with planetary final drives, hydraulic wet disc brakes, and an open operator station with an optional air-conditioned cab. It includes an open center hydraulic system with optional front and rear valves, and a rear independent PTO rated at 1000 RPM. Dimensions include a 105-inch wheelbase, 168-inch length, and a width of 112 inches over axle ends. The tractor weighs between 13,200 and 15,195 pounds depending on configuration.
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