A power take-off, or power takeoff, is one of several methods for taking power from a power source, such as a running engine, and transmitting it to an application such as an attached implement or separate machine. The cited article says that most commonly it is a splined drive shaft installed on a tractor or truck allowing implements with mating fittings to be powered directly by the engine. For farm implements it names the power delivered from a tractor shaft to a mower, baler or other attached machine, the other half of the combined hydraulic or power take-off value. Implements recorded in the atlas as driven by power take-off are grouped under this concept.
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1. Power Take-Off
Wikipedia, lead section
A power take-off or power takeoff (PTO) is one of several methods for taking power from a power source, such as a running engine, and transmitting it to an application such as an attached implement or separate machine.
History
International Harvester Company (IHC) was first to market with a PTO on a production tractor, with its model 8-16, introduced in 1918.
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