I've read several forum posts about this issue and really haven't found an answer. My Ford 4000 SU 3 cylinder Select-O-Speed has the PTO stuck where it won't disengage. I don't mind if the shaft turns a bit when the PTO is off and then when you hook up an attachment it stops. That was normal...but Now it's fully engaged when it should be off. Any thoughts? Is this a fix that's possible for a tractor newbie like myself?
- Thread starter Beark34
- Start date
Larry NCKS
Well-known Member
So . . . you have done nothing to PTO adjustments? The characteristics of the PTO operation just changed?
If so, then something has happened internally. If one has to go to the PTO clutch to fix the problem, it's a major SOS overhaul. The PTO clutch is the last thing to come out of your transmission.
Are you prepared to handle that kind of major undertaking?
Thanks for the wisdom. This is how it happened:
Since I've bought it (3-4 months ago), the PTO shaft always turned a little if the engine was running but I was told that once a load is put on then it will stop. Last night I hooked up an auger to it and started up the engine and the PTO was off and the auger did not turn. Then I went out to the yard to test it out, pulled out the PTO handle and the auger worked great. After I was done I pushed the PTO handle back in and the auger continued to turn as if it's still engaged. So all I've done with the PTO is turn it on and then off. I don't think my tractor has any other PTO controls. Do I have a PTO clutch that I'm not aware of?
mhb@ufe
Well-known Member
- Location
- Jefferson Maine
With the PTO off try setting the auger on the ground and see if it stops. If it does that would tell you the PTO clutch is ok and the auger didn't provide enough resistance to stop the PTO.
Mark
Mark
Larry NCKS
Well-known Member
Likely normal. Try loading it like Mark said. Bet it'll stop.
Sean in PA
Well-known Member
The PTO clutch is internal to the transmission and is controlled hydraulically by you pushing and pulling on the PTO handle on the dash. The handle controls a valve internal to the transmission via a cable that goes through a conduit from the back of the dash down into the transmission top cover, and the valve controls the PTO clutch. Those S-O-S PTO's have no brake so they will continue to spin when you turn them off. If there is enough of a load they will generally slow down and eventually stop, but as Mark said, maybe the auger isn't enough of a load. Try dropping the auger to the ground with the PTO handle pushed in to see if it stops then.
Dopp Creek
Member
My 4000 SOS PTO would run on more than I liked when it was disengaged. Sean in PA on this site had me check the length of the PTO cable. Once I
set it according to the service manual, it still spun a bit but with much less force. Made me happy to not have the rotary mower blades orbiting around.
Verify the cable length per the manual.
set it according to the service manual, it still spun a bit but with much less force. Made me happy to not have the rotary mower blades orbiting around.
Verify the cable length per the manual.
That sounds like mine. I tested it out yesterday a little more and it does get a little weaker when I disengage but it certainly is turning more than I'd like. We opened up the transmission to see if everything was still attached and moving well and it seemed to be. How easy is it to measure and shorten that cable? To me it seemed difficult to see the entire cable with everything else in the way.
Dopp Creek
Member
My memory is rusty but it is working with the T-handle at the dash and the conduit nut at the top of the transmission. Probably took me an hour to
fuss with it and I think I adjusted the length 2 or 3 times in the hour. I don't have a manual in the house or I'd look it up.
fuss with it and I think I adjusted the length 2 or 3 times in the hour. I don't have a manual in the house or I'd look it up.
Dopp Creek
Member
Send me an email and I'll send the page from the manual that way.
Larry NCKS
Well-known Member
You took the top off without knowing any more about your transmission than you do??? BIG NO NO!
You don't need a page out of a manual to adjust the PTO cable. Free it from the dash enough so you can turn the T-handle. Also loosen the upper conduit nut. Turn the T handle clockwise one turn. Reassemble it. Try the results. Check for stoppage under load, both disengaged and engaged.
Share the results eith us.
showcrop
Well-known Member
It is normal. I have a 971 that I use on various implements. What happened with your auger is that it got "limbered up" "warmed up," and loosened up so that it is now turning a lot more freely than when you first hooked to it. This has happened to me a number of times. Be prepared for problems due to the removal of the cover though.
Just curious...What kind of problems occur just by lifting up that plate a little? My neighbor who knows a lot more than I do about this was the one who came over and did it with me. But we basically just lifted it up on one side a couple inches just to peek in and everything seemed to be moving. Then we screwed it back on. Can that really cause problems?
showcrop
Well-known Member
If your neighbor is familiar with the correct procedure and you lifted just that side you will probably be OK. It is easy to get the upper and lower cable unhooked from each other. There is also a light gauge steel link that can get bent, along with some other situations that I don't recall, as it has been three years since I worked on my PTO cable.
OK thanks. I will say something unfortunate did happen when we lifted the cover and I'm ashamed it did because it was a stupid error on my part. But we believe a bolt fell in. We tried to get it with a telescopic magnet but never got it out. Do you think it will just sit at the bottom of the transmission away from all the gear action? I'm not quite sure how to get it out but we did test it out and everything seems to work alright at the moment. I'm hiding my face right now from all the comments I might get for such a stupid mistake!
Any thoughts on if its necessary to fish out or not and how?[/quote]Larry NCKS
Well-known Member
I guess you'll find out . . . if you choose to leave it in there.
Check Break
Member
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