International Harvester 68 series
1 model in this series
International Harvester 4568: water-cooled eight-cylinder diesel engine with 13,077 cc displacement, 231 hp (169.9 kW), 983 Nm torque as a heavy articulated tractor
The 4568 belonged to International Harvester's series of heavy, articulated four-wheel-drive tractors, built for the vast agricultural acreages of North America and going well beyond the size of classic standard tractors.
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The water-cooled eight-cylinder diesel engine of 13,077 cc produces 231 hp (169.9 kW) at 2,600 rpm and 983 Nm of torque. At an unladen weight of 11,680 kilograms, a wheelbase of 2,997 millimetres and a width of 2,946 millimetres, the 4568 is among the heaviest and widest of the series considered here.
An eight-cylinder engine of over 13 litres belongs to an entirely different world of work than the smaller four- and six-cylinder models of the same brand: such machines were designed for large-scale tillage with heavy trailed implements, not for use on small and medium-sized farms. Articulated steering — turning through a joint in the frame rather than through front-axle knuckles — is common on tractors of this size, as it allows large driven wheels on both axles without a knuckle-steering system.
When buying an articulated tractor of this size, the condition of the articulation joint and its bearings should be checked, along with the tightness of the hydraulics and axle drives. On an eight-cylinder engine of this displacement, compression in each cylinder and the condition of the injection pump also matter, since repairs to an engine of this size are correspondingly costly.
Sources: SpecCodex-Register: Kennwerte des Modells 4568
Models
Tractor in 3D section
Turn the model, look inside and click an assembly — each one is explained.
