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Originally Posted by Rickstir
Appreciate any and all comments.
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They're common on medium to heavy duty rotary cutters too. Basically it's two friction discs sandwiched between three pressure plates. Most often they're on the implement end of the
PTO driveshaft. One end connects to the implements transmission input shaft. The other end (eventually) connects up the tractors
PTO output shaft.
Up to 8 bolts hold the sandwich together lengthwise, using compression springs at the threaded end. Under normal usage, the spring tension keeps the sandwich rotating at the same speed as the
PTO shaft. But if you hit something significant with the rotating implement, the friction plate (or plates) slip against the pressure plates. That permits the tractor
PTO output shaft to continue to run at normal speed without being damaged by whever slowed down the tiller/mower rotation.
//greg//