Oliver 70-SERIE
1 model in this series
Oliver 70 HC/KD: American six-cylinder tractor of the 70 Series with a water-cooled engine and 21.2 kW output, built between 1937 and 1948
Oliver was an American tractor manufacturer based in South Bend, Indiana, later absorbed into the White Motor Corporation. The 70 Series was unusual for its time, running a six-cylinder engine instead of the four- or two-cylinder layouts then common.
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The 70 HC/KD is powered by a water-cooled six-cylinder engine of 3.3 litres, built to run on petrol or kerosene, delivering 21.2 kW at 1,500 rpm, roughly 28.8 hp. At an unladen weight of 1,995 kg, a height of 1,343 mm, a length of 3,429 mm, a width of 1,562 mm and a wheelbase of 1,829 mm, the machine has a design top speed of 9.8 km/h.
The six-cylinder engine ran more smoothly than the common two-cylinder tractor engines of the day, a point Oliver used against its competitors; the combination of six cylinders and low revs gave a smooth, steady run that reduced driver fatigue during long hours of fieldwork. The low top speed of under 10 km/h shows the machine was built for pulling power in the field rather than road transport.
When buying a six-cylinder Oliver of this age, check for even running across all six cylinders, the condition of the carburettor and ignition distributor, and the tightness of the cooling system. Spark plugs and distributor contacts need closer checking than on a four-cylinder engine; parts for this rarer six-cylinder engine are harder to find than for the brand's common four-cylinder models.
Sources: SpecCodex-Register: Kennwerte des Modells Oliver 70 HC/KD, Oliver Farm Equipment Company (Wikipedia)
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