page_title: Power take-off
hierarchical_section_title: Power take-off
caption_attribution_description: Deutsch: Zapfwelle/Nebenantrieb am Heck eines John-Deere-Traktors (Baujahr 2001) English: Power take-off (PTO) at the rear end of a John Deere tractor (year of manufacture 2001)
context_page_description: A power take-off or power takeoff is any 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.
  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.
  Semi-permanently mounted power take-offs can also be found on industrial and marine engines. These applications typically use a drive shaft and bolted joint to transmit power to a secondary implement or accessory. In the case of a marine application, such shafts may be used to power fire pumps.
  In aircraft applications, such an accessory drive may be used in conjunction with a constant speed drive. Jet aircraft have four types of PTO units: internal gearbox, external gearbox, radial drive shaft, and bleed air, which are used to power engine accessories. In some cases, aircraft power take-off systems also provide for putting power into the engine during engine start. See also Coffman starter
context_section_description: A power take-off or power takeoff (PTO) is any 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.
  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.
  Semi-permanently mounted power take-offs can also be found on industrial and marine engines. These applications typically use a drive shaft and bolted joint to transmit power to a secondary implement or accessory. In the case of a marine application, such shafts may be used to power fire pumps.
  In aircraft applications, such an accessory drive may be used in conjunction with a constant speed drive.  Jet aircraft have four types of PTO units: internal gearbox, external gearbox, radial drive shaft, and bleed air, which are used to power engine accessories. In some cases, aircraft power take-off systems also provide for putting power into the engine during engine start. See also Coffman starter
caption: A PTO at the rear end of a farm tractor.
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