![]() ![]() In addition to clothing, additional items that can become caught in the PTO include jewelry and long hair. Boot laces, pant legs, overalls and coveralls, and sweatshirts are clothing items that can become caught and wrapped around a spinning PTO stub shaft. The reasons a PTO stub may be left engaged include: the operator forgetting or not being aware of the PTO clutch is engaged seeing the PTO stub spinning but not considering it dangerous enough to disengage or, the operator is involved in a work activity requiring PTO operation. Most incidents involving PTO stubs result from clothing caught by an engaged but unguarded PTO stub. Note: 1000 rpm speed PTO shafts have more splines on the shaft. At all speeds, they rotate in proportion to the speed of the tractor engine. The PTO and drive shaft rotate at 540 rpm (9 times/second) or 1,000 rpm (16.6 times/second) when operating at full recommended speed. Power transfer is accomplished by connecting a drive shaft from the machinery to the tractor's PTO stub shaft. The tractor's stub shaft, often called the PTO, transfers power from the tractor to the PTO-driven machine or implement. U Joints are connected by a square rigid shaft which turns inside another shaft.įigure 1. The flexible universal joint or "U joint" makes the connection from the tractor to the implement. Examples of this type of connection include three-point hitch mounted equipment (e.g., post hole diggers, small rotary mowers, etc.) and augers. The bottom drawing is of a PTO system where the implement's input driveline connects directly to the tractor PTO stub. The upper drawing is of a PTO system involving a pedestal connection as found on many types of pulled machinery (e.g., hay balers, forage choppers, large rotary mowers, etc.). Components of an Implement Power Take-Offįigure 1 is a diagram of component parts of an implement PTO to better understand PTO hazards, guarding, and injuries.
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