International 634

The flagship of the Doncaster factory in 1968 was the 634, introduced as the successor to the B-614, whose power was increased to 66 horsepower DIN. The engine was an England-made 4.6-liter pre-chamber diesel that produced its peak power at 1600 rpm. The basic engine design originated from a gasoline engine developed in the USA during the 1930s and featured only 3 main bearings and dry cylinder liners. The 13" clutch disc was ceramic. The draft control system was borrowed from American IH models. The hydraulics were quite powerful for the time, with a flow rate of 39 liters per minute and a lifting capacity of 2300 kg. Technically, the 634 was quite advanced aside from the antique engine. Some refinements, such as hydrostatic steering and a power take-off independent of the driving clutch, were, however, optional extras in Finland. The 634 in Finland was equipped with a Horsma cab. The SAE power was reported in Finland as 78 hp at 1800 rpm. There was also a rare four-wheel-drive model of the 634, with the four-wheel-drive system supplied by County.

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