Abstract: Crawler tractor adapted for stepless hydromechanical steering by driving. The power train terminates in a novel hydromechanical steering differential delivering its output to an oppositely extending pair of axles at the sides of the tractor, and forced by a differential lock in a straight line locked, primary steering condition thereof to drive the axles at a mechanically fixed 1:1 drive ratio therebetween and, secondarily, forced into differentiating by a variable displacement crossfeeding pair of axle-interconnecting hydrostatic pump/motor units during all turns so as to selectively drive either axle only at some hydrostatically fixed reduction drive ratio to the other.

Abstract: A fan blade assembly having a spider shaped or formed from rod, wire or bar stock.

Abstract: Heat exchange apparatus including a toroidal-type radiator having radially extending cooling air passageways formed through the core thereof, a rotary fan positioned radially inwardly of the radiator core, fan shroud means shaped and positioned with respect to the radiator core and the blades of the fan whereby the air stream induced by the fan during operation has a major component in a radial direction, and air recirculation barrier means for substantially eliminating the recirculation of air at the hub region of the fan.

Abstract: Heat exchange apparatus including a toroidal-type radiator having radially extending cooling air passage-ways formed through the core thereof, a rotary fan positioned radially inwardly of the radiator core, fan shroud means shaped and positioned with respect to the radiator core and the blades of the fan whereby the air stream induced by the fan during operation has a major component in a radial direction, and an auxiliary radiator structure axially spaced from the rotary fan.

Abstract: Heat exchange apparatus including a toroidal-type radiator having radially extending cooling air passage-ways formed through the core thereof, a rotary fan positioned radially inwardly of the radiator core, and fan shroud means shaped and positioned with respect to the radiator core and the blades of the fan whereby the air stream induced by the fan during operation has a major component in a radial direction.

Abstract: The invention disclosed in this application relates to an improvement in a water cooling system for an engine of the type that passes air and water through the radiator at relatively low flow rates whenever the engine is running in its low idle speed condition. The radiator is disclosed as having upper and lower headers interconnected by a plurality of parallel extending rows of water tubes. A means responsive to the engine speed is provided for converting the water flow through the water tubes from a plurality of parallel paths to a single series path upon the engine speed dropping to its low idle speed condition.

Abstract: A cross flow blower unit for use in a grain cleaning system of a self-propelled combine harvester. The rotor of the blower unit doubles as a rotary heat exchanger for use in the engine coolant system and furnishes a heated air stream to the grain cleaning system for drying and removing moisture from the kernels of grain undergoing cleaning treatment therein.