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John Deere Tractors Discussion Board

'66 Powershift PTO won't stop at 1900 RPM

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Posted by dweitzel on January 28, 2013 at 16:28:26 from (

Just read through 1500+ posts about the PTO and could not find my exact problem.

I have a recently split/repaired 1966 Powershift 4020. After warming up, at any RPM under 1500, the PTO shuts off correctly. At 1500 RPM, it takes 20-30 seconds for the PTO to stop. At 1900 RPM, the PTO will not stop unless I use a 2x4 to put pressure against the PTO and the drawbar and it will chew up the 2x4 a bit so there is pressure on the PTO to make it turn and not just drag.

I tested the "BR" port on the side and I get 150 psi at RPM"s below 1500 and I get between 155-160psi at 1900 RPM. The gauge shows no residual pressure when the PTO lever is pulled toward me.

Almost seems like there is pressure bleeding past something at 1900 RPM, like a check valve is being held open.

The mechanic that split the tractor replaced the front main seal and said when the front clutch assembly was out, he could look back into the case and the PTO brake lining looked "great".

Do you think I could possibly take one of the washer "shims" off the pressure regulator below the PTO valve? I"m assuming I can get to this easily from underneath the right side of the tractor?

The 3-point operates correctly. I only loose about 10-15 psi momentarily from the CL port when the inching pedal is pressed. Steering works fine.

The PTO will not stop at 1900 RPM, takes 20-30 seconds to stop at 1500 RPM, and pretty much works correctly under 1200 RPM.

I also backed the "stop screw" out from the PTO linkage under the dash to make sure it was not being held open by the stop screw. I have not checked the lower portion of the lever.

Any ideas?


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