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Explanation of a live PTO

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Randy

07-22-2002 20:21:50




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What is the difference or advantage of having a Live PTO vs. a regular PTO. I have a few Ferguson TO 30's, that do not have a live PTO.
What would be the advantage of having one, if any at all.




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Phil (VA)

07-23-2002 07:56:49




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 Re: Explanation of a live PTO in reply to Randy, 07-22-2002 20:21:50  
Here's an example. With live PTO, such as on the TO-35 or F-40, you depress the clutch half way and the tractor is out of gear but the PTO can continue to run. You depress the clutch the remainder of the way to stop the PTO. This is helpful for example when you are digging post holes or mowing in a corner, etc. In other words you can run the PTO with the tractor not moving and still in gear. You cannot do that with the TO-30.

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Randy

07-23-2002 10:27:44




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 Re: Re: Explanation of a live PTO in reply to Phil (VA), 07-23-2002 07:56:49  
So you mean it's another word for saying "double clutch". Pushing half way to disengage the gear, but the pto still runs, then pushing all the way will disengage everything. Wouldn't having a overrunning coupler on the pto serve the same purpose. This is what we use to cut in corners, or be able to cnage gears on the fly, with the cutter still runs. It seems like this does the same job as having a live pto.

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Phil (VA)

07-23-2002 14:14:29




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 Re: Re: Re: Explanation of a live PTO in reply to Randy, 07-23-2002 10:27:44  
No not the same. First, term double clutch is mostly used to indicate means to get tranny into a gear, like on older non synchro vehicles, and that is an operating trick, not a feature. What we are talking about is normally called two stage clutch. As you mash the clutch there is a noticeable pressure change spot. As to benefits, on your TO-30, one major problem is you can't raise the lift without having the PTO on. So your post hole digger is turning whenever you raise the lift, definitely more dangerous, especially if you have a helper on the ground. And to get the PTO to turn and dig a hole when you want it to do so, you have to kick the tractor out of gear each time, since the clutch has to be fully released. Maybe that helps some. Perhaps others can jump in to clarify.

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David (Scotland)

07-24-2002 11:12:27




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 Re: Re: Re: Re: Explanation of a live PTO in reply to Phil (VA), 07-23-2002 14:14:29  
What everyone's said is quite correct but I would add that not having a live PTO is a complete pain and would NEVER buy a tractor for any kind of hydraulic lift work unless it was live PTO. If its not live you can't lift the links unless the tractor is either moving forward or is out of gear. Try scraping out a dairy cublicle shed with non live PTO and see how often you have to knock it in and out of gear. Baling is also difficult as you can't dip the clutch to slow the ground speed down temporarily to cope with lumpy swathes. If you only do drawbar work and don't use the hydraulics non-live/single stage clutch may be ok otherwise its a nuisance that tractor makers very sensibly got rid of as soon as they could. What is means is that the PTO and hydualic pump keep working (stay "live") when you push the clutch through its first stage of travel which disconnects the drive to the gearbox and lets you stop/change gear. Second stage of clutch travel disengages the drive to the PTO. Next development is independant PTO (IPTO) which works all the time and is usually controlled hydraulically by a separate lever. Clutch is normally single stage with IPTO as there'e no need for the second stage. In this set up. Most tractors have this now.

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