Quote:
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Originally Posted by greg_g
If your driveline clutch is disengaged (or the transmission is in neutral) explain to me how a still-rotating implement PTO shaft canl drive the tractor wheels. Now if you said " hit the brakes to stop the tractors forward movement"......
It is as I said; a typical ORC permits the implement PTO shaft to turn faster than the tractor PTO output shaft. Period.
I do however, heartily agree with the hardened roll pin sugggestion.
//greg// |
Greg,
If you ever get a chance to drive an old Ford 8N with a bushhog attached that is not equipped with an ORC, it will quickly become very clear! The ORC prevents the momentum of your
PTO powered implement from backfeeding power back into the transmission when you disengage the clutch on your tractor, such as when you're trying to stop to change gears/direction.
If your tractor has Live or Live Independent
PTO, then you don't need an ORC, since the
PTO power path in the transmission is not connected to the wheel drive power path. However, in a "Transmission Driven"
PTO, this isnt' the case... The power path through one of these tractors for the
PTO and the wheels is one and the same. Explained another way... If you jack up the rear wheels, then engage the
PTO and then go back and turn the
PTO shaft by hand, then you will also see that the rear wheels will turn as well (obviously, assuming that you have the transmission in gear and the clutch depressed so that you're not trying to turn over the engine as well). The ORC is simply a "one-way" clutch that prevents the implement from backfeeding power back into the transmission.
Although it's technically correct, when you say:
Quote:
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Originally Posted by greg_g
a typical ORC permits the implement PTO shaft to turn faster than the tractor PTO output shaft. Period." |
...I don't think it clearly conveys or describes the real job that the ORC is there to do... when you describe it in terms of "power transfer" I believe it better paints the mental picture of what the ORC does.