Who has disabled the safety device called

[Renze]

Originally Posted by john_bud

On most modern tractors, there is a built in one way clutch in the PTO. It allows the implement to rotate freely without transmitting any power back to the transmission.

Tractors from the early 60's and back, were direct connected between the implement and the transmission. Many many many seats have been stained brown when the clutch was put in and the tractor powered into the ditch, trees, barn, road, etc when the rotational energy of a bush hog powered the transmission.

This is actually because old tractors had a single PTO: when you pressed the clutch pedal, it would only disconnect the engine from the rest of the transmission, but leave the PTO and wheel drive locked together. With a dual stage clutch, the PTO and gearbox are not locked together anymore when you press the PTO clutch.

I have never worked with tractors without dual stage clutches... talking 1965 and newer.

[schmism]

didnt come with one.

if i had one, it would be disabled.

my cruse control disable switch has been moved to the clutch peddle were it belongs.

[john_bud]

Originally Posted by Renze

This is actually because old tractors had a single PTO: when you pressed the clutch pedal, it would only disconnect the engine from the rest of the transmission, but leave the PTO and wheel drive locked together. With a dual stage clutch, the PTO and gearbox are not locked together anymore when you press the PTO clutch.

I have never worked with tractors without dual stage clutches... talking 1965 and newer.

I think you are only partially correct. A simple dual stage clutch has two stages of engage with the flywheel. One stage for the motive power and one stage for the PTO power. If you step on the clutch all the way down, a rotary mower will still power the transmission from the PTO. Same as a single stage clutch with direct PTO.

You may be thinking of an independant PTO with a dual stage clutch. That would fit the experience you describe. It has a built in one way sprag to stop the power from the PTO going back into the transmission.

[gemini5362]

Originally Posted by john_bud

I think you are only partially correct. A simple dual stage clutch has two stages of engage with the flywheel. One stage for the motive power and one stage for the PTO power. If you step on the clutch all the way down, a rotary mower will still power the transmission from the PTO. Same as a single stage clutch with direct PTO.

You may be thinking of an independant PTO with a dual stage clutch. That would fit the experience you describe. It has a built in one way sprag to stop the power from the PTO going back into the transmission.

OK john now you have me confused.
I had a massey 65 when you pushed the clutch half way down it disconnected the PTO when you went all the way down it disconnected the transmission clutch. With the clutch pushed half way in the rotary mower did not power the transmission the way it did on my ford 8n

[Bedlam]

Maybe this will help.
TractorData.com - Power Take-Off

http://www.tractorsmart.com/main/Tra...ff%20Types.htm

[aczlan]

affording to the site linked by bedlam, gemini5362 has a live PTO with a two stage clutch, if his MF 65 is like my dads Industrial 35 the two stages are independent when the clutch pedal is pushed down (IF you selected live pto not the transmission drive one, the Industrial 35 has both) so if you are bushhogging and need to stop to let the mower catch up you push the clutch halfway down, if you want to stop the bushhog and the tractor, you push the clutch all the way down.
with the live PTO selected and the clutch all the way down the PTO does NOT have any effect on the transmission (ie: it does not "push" it).

Transmission
The simpliest, and earliest, form of PTO is the transmission PTO. The PTO shaft is directly connected to the tractor's transmission. The PTO is only working when the tractor's clutch is relased, so if you take the tractor out of gear while slowing down the PTO will stop working. This is a disadvantage in applications such as mowing.

Live (two-stage clutch)
A live PTO works with the use of a two-stage clutch. Pressing the clutch half-way will disengage the transmission while pressing it fully will disengage the transmission and the PTO. This allows the operator to slow down or change gears while the PTO is still operating.

Independent
An independent PTO means that the PTO shaft is controlled with a separate clutch. As with a live PTO, this allows for full control over the tractor while separately controlling the PTO. There are two major types of independent PTO; mechanical and hydraulic. A mechanical-independent PTO uses a separate on-off selector, in addition to the PTO control lever. Often the tractor must be stopped or off to change this selector position. A hydraulic-independent PTO uses a single selector.

Aaron Z

[john_bud]

Originally Posted by gemini5362

OK john now you have me confused.
I had a massey 65 when you pushed the clutch half way down it disconnected the PTO when you went all the way down it disconnected the transmission clutch. With the clutch pushed half way in the rotary mower did not power the transmission the way it did on my ford 8n

Aaron Z has the better explaination ....

jb

[gemini5362]

Thanks aaronz your explanation is how I remember my massey working. I dont have it any more I traded it in on my Montana.