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John Deere Tractors Discussion Forum
Show Parts for Model:

Re: '66 Powershift PTO won't stop at 1900 RPM

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WTW

01-28-2013 18:02:45
204.12.185.249



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Sir, The pressure on the PTO BR (BRAKE) test port should be more than adequate to stop a normal PTO clutch from coasting. If clutch pressure is zero when the brake pressure is applied you have one of two possibilities causing this condition. First possibility is the PTO clutch is dragging due to too many plates installed or warped plates and disk. This should not be the case if clutch pack/PTO element was serviced when removed. Second cause is that the PTO brake anchor pin has sheared/broke and PTO brake shoe and piston is spinning in bore when applied against turning PTO idler gear. When the mechanic was inspecting the brake shoe lining he should have checked to see if it would turn. If it did the anchor pin holding shoe from rotating has failed. This is not that uncommon on the older PowerShift transmissions. Good Luck, DW

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Tx Jim

01-29-2013 04:41:22
67.142.163.24



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 Re: '66 Powershift PTO won't stop at 1900 RPM in reply to WTW, 01-28-2013 18:02:45  
I agree with WTW.



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dweitzel

01-28-2013 19:06:34
72.49.81.47



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 Re: '66 Powershift PTO won't stop at 1900 RPM in reply to WTW, 01-28-2013 18:02:45  
Maybe I did not explain correctly. The test port "BR" is zero psi when the pto lever is off, and 155-160 at 1900 RPM when the pto is on.

The "CL" port is a constant 155-160 psi at 1900 rpm. The "CL" port fluctuates only slightly when I press in the inching pedal.

If the pin is sheared, why does the pto work correctly when the rpm is less than 1200? at 1200 RPM and below, the pto functions normally?

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dweitzel

01-28-2013 19:08:49
72.49.81.47



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 Re: '66 Powershift PTO won't stop at 1900 RPM in reply to dweitzel, 01-28-2013 19:06:34  
I'm calling the "BR" port the one to the right and the "CL" is to the left or front of the tractor. I do not have my manual in front of me. I hope I'm describing them correctly.



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dweitzel

01-29-2013 14:28:49
74.215.54.8



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 Re: '66 Powershift PTO won't stop at 1900 RPM in reply to dweitzel, 01-28-2013 19:08:49  
Ok, did some more testing today. Decided to pull the oil pressure regulator from the bottom of the transmission, below the PTO valve. Found 8 shims in the assembly. Removed all the shims, tested the PSI at about 120 and PTO would not shut off at any RPM.

Replaced the 8 shims and inserted about 4 more shims (washers) and that brought the PSI to 180-185 and the PTO now works correctly.

Now the question is why do I need the PSI on the clutch port to be 30 PSI above the specs called for? Is this going to hurt anything to leave it this high? I guess I could remove a few washers and maybe set it down to 170-175 and see if that works. I could live with some no load rotation and set the PSI down a bit.

One other question, would setting the PSI up this high cause any leaks from the front of the transmission input shaft? I have drips about every 8 seconds coming out the weep hole in the bottom of the bell housing now? :(

Anyone with a powershift care to chime in. How much spin is normal after turning off the PTO at high RPM"s? At 185 PSI, the pto shaft without anything hooked up stops immediately after shutting off the PTO lever? Am I expecting too much from a 46 year old tractor?

Thanks.

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dweitzel

01-29-2013 17:02:27
74.215.54.8



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 Re: '66 Powershift PTO won't stop at 1900 RPM in reply to dweitzel, 01-29-2013 14:28:49  
Guess I missed something. Looked at the manual and it appears I've been testing the "Clutch" port and the "PTO" port. I did not know the "BR" test port is up higher and behind the inching pedal. Guess I need to get that snap ring off and get my gauge on the "BR" port to see what the pressure there is reading. I'll put the correct shims back in the pressure regulator and pull the inching pedal and test the "BR" port. Missed that one. Stay tuned.

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