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3 pt. hitch education

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Case450

07-21-2007 20:33:06

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I would like to know how the average three point hitch system works (the lift and lower functions).
What is the difference between a P.T.O. and a live P.T.O or is there any? I have a tractor that has a modified backhoe on it so i've never used it as a tractor per se.
However we have had two tractors before but since sold them.
I bought a new truck and wish to trade my old truck for a tractor. I have a brush hog and a scraper blade but no tractor to attach them too.
I would like a bit of insight as to how the three point hitch system works to raise and lower and set heights for the use of implements.

I will educate myself further when I do get my paws on a new to me tractor but for now I'd like to get the basics.
Thanks!

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Jerry/MT

07-21-2007 21:47:28

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Re: 3 pt. hitch education in reply to Case450, 07-21-2007 20:33:06

There is hydraulic cylinder/piston assembly with a link on the piston that attaches to an arm on the rockshaft. The hydraulic pump supplys pressure and flow to the cylinder through a control valve. When the contol lever is raised, the control valve directs pressure and flow to the cylinder port, cauing the piston to extend which pushes on the piston rod which pushes on the arm attached to the rockshaft. This causes the arm to rotate and lift the lift arms upward and raise the lift links. When the contol lever is lowered, the control valve dumps the pump out put to the reservior along with the fluid in the cylinder and the weight of the lift and implement lower the links.

PTO stands for Power Take OFF and is a shaft if the shaft is driven off the transmission, it's called a tansmission driven PTO or just the pto. This type needs an over running clutch to safely use a mower or anything with a high rotary inertia because when you step on the clutch, the inertia of the attached equipment will drive the tractor. A live PTO has a two stage clutch. The first stage connects the pto to the engine and the second connects th transmission to the engine.When you step part way down on the clutch, you deengage the pto but the other clutch still drives the transmission so the tractor continues to move. Stepping down all the way on the clutch then disconnects the transmission from the flywheel.
Though you didn't ask, there is a third type of PTO, the independent PTO. It has its own clutch pack and it's own drive shaft. You can activate it without using the clutch pedal. When you apply the PTO lever, hydrauic pressure from the main pump is ported to the clutch pack and causes the clutch to engage which then drives the pto. Hope this helps you.

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135 Fan

07-21-2007 22:19:58

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Re: 3 pt. hitch education in reply to Jerry/MT, 07-21-2007 21:47:28

I think you got confused. With a live PTO, when you push the clutch half way down, you stop the tractor motion but the PTO keeps running. When you step all the way down on the clutch, the PTO stops as well as the tractor. The nice thing about a live PTO is that you can get your implement (a mower for example) up to speed before you start moving or stop the tractor if it starts to bog or slow down because of too much load. Hope this clarifies it for you. Dave

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Jerry/MT

07-22-2007 12:45:10

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Re: 3 pt. hitch education in reply to 135 Fan, 07-21-2007 22:19:58

Thanks for correcting me! I don't have a live pto so I knew the how it basically worked but I had the order incorrect. Thanks again!

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Case450

07-22-2007 06:53:53

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Re: 3 pt. hitch education in reply to 135 Fan, 07-21-2007 22:19:58

Thats exactly what I was looking for. Because I want to do some grading with my scraper blade and open up some more acreage, from the sounds of it, I'd be better to get a tractor with live PTO.
Thanks guys!!

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135 Fan

07-22-2007 09:13:50

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Re: 3 pt. hitch education in reply to Case450, 07-22-2007 06:53:53

If you plan to use a mower or rototiller or any other PTO powered implements a live PTO is a real bonus. With a blade it doesn't make a difference as it is not PTO powered. Dave

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