International Harvester 644

The International Harvester 644 is a utility tractor known for its robust engine and solid construction. It is powered by a 60 hp (44.7 kW) International Harvester D-206 diesel engine, with a displacement of 206.4 cubic inches, which provided dependable performance and offered the needed power for a range of farming tasks. The cooling system was liquid-cooled, ensuring the engine ran efficiently even under high strain conditions. Its transmissions offered 8 forward gears and 4 reverse gears which facilitated ample choice for various speeds needed in agricultural operations. The tractor operated on an electric starter system with 12 volts. Although many details about the tractor's steering, hydraulic, and PTO systems remain unspecified, it remains a notable model for its era. The front and rear tire size designations indicate a sturdy machine capable of competent fieldwork. The overall dimensions suggest a mid-sized tractor with substantial weight to provide good traction and stability. This model was a valuable asset, especially in tasks involving plowing, tilling, and haulage, in which a reliable and powerful engine coupled with a versatile transmission was critical.