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Live PTO or not

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Rick(Ga)

08-16-2001 07:52:22




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I was recently told by a man who buys and sells old tractors that a transmission driven PTO with an overunning coupler was just like having live PTO. He said you could engage and disengage the PTO with the tractor in gear and moving. If this is true then my understanding of live PTO is not clear. I thought with a transmission driven PTO, even with an overunning coupler, you had to come to a complete stop to engage the PTO. Any comments appreciated. Rick(Ga)

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Dick N.

08-17-2001 11:45:34




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 Re: Live PTO or not in reply to Rick(Ga), 08-16-2001 07:52:22  
You are right, you still have to push the clutch in to engage the pto, but with a bush hog type mower behind you, you can bring the mower up to speed and then push in the clutch and put the tractor in gear. Much easier to get moving this way.



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bj/8N/mt

08-16-2001 15:17:03




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 Re: Live PTO or not in reply to Rick(Ga), 08-16-2001 07:52:22  
Live PTO and ORC are apples and oranges. Ken is correct that an ORC will stop the momentum of the implement from driving the tractor forward thus preserving many thing you might otherwise damage sometimes including the operator.

NAA's are the first Fords with live PTO so you can use the PTO and hydralics with the transmission clutch disengaged. N series PTO's are a habit you must acquire since; for example, you cannot raise implements with the clutch depressed.

Your mileage may vary

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ken in wisconsin

08-16-2001 08:37:06




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 Re: Live PTO or not in reply to Rick(Ga), 08-16-2001 07:52:22  
I think you are really asking the wrong question here. The real problem with "non-live" PTO is not putting it in gear while the wheels are turning, but keeping it in gear when you stop the wheels turning. Imagine if you are hogging( or blowing snow, or baling hay) in stuff that is too heavy for the forward speed you are in. The only way to stop the wheels is to put in the clutch, which will also stop the power to the implement. On the other hand, with live PTO, you can push the clutch far enough to stop forward motion, but still keep the implement running to clear itself of the brush ( or snow or hay), then let the clutch out to proceed again. All an overrunning coupler does is prevent the inertia of the running implement from driving the tractor forward when the tractor is in gear but the clutch is pushed in. It is true, with live PTO that you can not put the PTO in gear unless the clutch is pushed in, since the "two-stage" clutch first disengages the transmission from the engine, and then disengages the PTO when the clutch is fully depressed.

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Big Jake

08-17-2001 11:08:25




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 Re: Re: Live PTO or not in reply to ken in wisconsin, 08-16-2001 08:37:06  
Of course a modern tractor has a seperate pto
clutch & brake which is engaged as a seperate lever & the 3 point can be raised with out the PTO running & would have a draw bar & hyd. hookups



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