The splines provided over the PTO out shaft is also different for avoiding accidental attachment of implement of the different speed setting. Later this speed was changed to 540 rpm and another speed was added to the standards i.e. Prior to 1958, the standard PTO speed was 536 rpm. The pulley arrangements are made with the standard PTO speed in mind. For example, the threshers are supposed to run at a particular peripheral velocity of the threshing cylinder. Standardization of the speed of the PTO is important so that the equipment can be designed around the given speed. The countershaft of the gearbox is usually extended out to the rear side to act as the PTO outlet. Power to the PTO shaft comes from the gearbox. In India, the PTO is usually on the rear side, but in developed countries, a front PTO is also an option for powering front-mounted attachments. PTO was first introduced by International Harvester Company in 1918. The power outlet is known as Power Take Off (PTO). A power outlet is generally provided at the rear of the tractors. A tractor is used for not only pulling the implements for tillage operations and sowing of various crops but also used to power stationery and moving equipment for doing operations such as threshing of crops, pumping water from tube-wells, spraying, rotavator and others.
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