Re: Whats a ground speed P.T.O

Posted by paul on December 28, 2004 at 13:32:01 from (66.60.196.158):

In Reply to: Whats a ground speed P.T.O posted by 16535 on December 28, 2004 at 00:55:42:

No, they are different - or can be. Ground speed transmission means the pto speed is related to the gear you are in - the pto will turn faster in high (tranny) gear and slowly in low gear, all other things (throttle) being the same. The pto may or may not be independent, ground speed is just a different extra feature.

Could you continue this thread by supplying a little more info on what it is you are looking for? I understand all the different pto types, but the converstion here is confusing me!!!!! :) :) :) You are getting some difficult to grasp replies to this.

I'm going to assume you are looking at Ford tractors, and you want to understand the different types of pto available & what is good & what isn't?

A non-live pto will stop _every_ time the clutch is pressed. Inside, the pto is run by the same stub shaft that also runs the tranny. So, this pto will always run the 'proper' speed in relation to the engine speed, but the rear wheels and the pto are locked together any time the pto is engaged. If you are in neutral, the pto works fine. If you are in gear, you must start the pto & the wheels turning at the same time. Any time you push in the clutch, both the rear wheels and the pto are disengaged at the same time. If you have a large brush-cutter or other big load on the pto this will act like a flywheel, and even if you push in the clutch, the pto implement will spin down & continue to 'drive' the rear wheels for a ways. Rather dangerous.

Live pto is a tractor with 2 clutches, one for the tractor tranny, one for the pto. This is a good handy system. Both clutches are operated by the same clutch pedal, but at different times. You can push the clutch 1/2 way down and stop the tractor tranny, stop moving or shift into or out of gears. The pto will continue to operate. Real nice for running a baler or a snow blower or most implements. In order to put the pto in gear, you need to push the pedal all the way down, so to go in pto gear you need to stop tractor movement. However, the power for the tranny & the power for the pto come from different clutches, so the pto & tranny are never locked together. Much safer.

Independent pto is often confused with or interchanged with 'live' pto. It is a different form of live pto. It allows you to independently engage or disengage either or both the tranny clutch & the pto clutch at different or the same times. It has a usually larger lever for the pto and this lever directly controls the pto clutch - at any time, no matter what you are doing with the foot lever which only contols the tranny.

Then they came out with hydraulic independent pto. This is the same as above, but has a smaller pto lever that controls some hydraulic flow that is used to engage or disengage the pto clutch with hydraulic pressure. Some consider this a step backwards, as you lose any chance of feathering the shock load of the pto, and they often have a pto brake which can be hard on some pto equipment. In other words, it is either totally on or totally off, with not much forgiveness as loads start up or spin down. It is the newest version of pto tho, biggest & best I guess.

For a brief time some tractors came out with a ground-speed pto. Frankly, you will never use it. There are only a few rare implements where it has any point to it, like a pto driven side rake. Most pto implements are designed to run at 540 rpm, and the whole ground speed deal is a waste of time on them..... This ground speed is _usually_ a seperate lever setting, in addition to the regular speed pto, and can be found on all the different types of pto types. Tho it is a rare & little needed option.

If you are looking at Ford tractors, the early N series had aweful pto/ hydraulics, nothing live, and the pto needed to run to make the 3pt & hydraulics work. Lots of safety & ease of use issues there.

Newer series up until present day you will find a lot of non-live pto type. All until the 100 series x6x models were not live pto. From the NAA on at least the hyd were live.

From _some_ of the 100 series Ford tractors you will find a live, 2-stage pto on them (those with a '6' in the middle of their number, like 660, 961, etc.). These 2-stage clutches are still popular on current Ford tractors of today.

The SoS Ford tractors had an independent pto, those with a x7x number were independent, those with a x8x number also had a ground speed option in addition to independent. (But to answer your generic question, not _all_ ground speed pto's from all makers were also independent - quite a few were not!)

Newer models, like the 5000 series probably have an independent pto, tho you will find a mix of live, 2-stage, and even some non-live ptos on various tractors in all the different colors of today.

Your questions are very broad & wide, and this is a very confusing topic. Could you reply back with a more narrow, specific question if some of this is not making sense? We'd be glad to help, but it is quite a big topic with a lot of little details, I see how confusing it becomes. It is hard to answer your question appopriately, as there are different ways to take it....

For me, I want a tractor with either live or independent pto. I personally prefer the older hand-clutch independent pto over the newer hyd clutch ptos, but the hyd units are good too. I find little practical difference beween operating a live 2-stage pto tractor or an independent pto one, but the independent is probably slightly better for a few things.

I have a tractor & used to have more without any type of live pto, and they are more diffiult to use with some implements.

I have 7 tractors, and have all types _except_ ground speed pto. I use them all on a farm. I really see little practical difference in a live or independent pto, unless you have a real specific need for independent. Does that help you?

I can think of no practical use for a ground speed pto unless you happen to want a pto driven siderake, mostly a useless option.

Does that help any?

--->Paul

Follow Ups:

• Re: Whats a ground speed P.T.O Magne olav 19:14:07 12/29/04 (1)
  • Re: Whats a ground speed P.T.O paul 21:04:34 12/29/04 (0)

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