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Ford Tractors Discussion Forum
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Ford 671 PTO won't stop

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ScottSD

06-28-2006 07:53:28




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Hi,

I've got a Ford 671 with the Select-o-Speed transmission. The PTO doesn't stop when it's not supposed to be enganged. If I have a fairly heavy load on it, it is fine. For example, my New Holland 273 Baler is enough of a load on it and my Woods RM306 finish mower is fine.

However, my sickle mower is not enough of a load on it and I sure would like it to not run the sicke bar when I want to lift the bar or when I want to clean the grass from it. As it is, I have to turn the tractor off in order to do this.

When I called the local New Holland parts dealer, he initially said that it would be the brake for the PTO, but upon further investigation, he said this particular model didn't appear to have a bake...but I got the feeling he wasn't exactly sure about it.

Doesn any body know what the problem is? Does it have a brake?

Thanks,
Scott

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Dean

06-28-2006 18:51:02




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 Re: Ford 671 PTO won't stop in reply to ScottSD, 06-28-2006 07:53:28  
Scott:

I agree with what the others have said. The PTO on the S-O-S will run with no load on it even when turned off due to drag between the drive and driven members in the PTO clutch. However, this effect should not be enough to operate your sickle bar mower when the PTO is off.

Does your transmission have the correct oil in it? Incorrect oil can aggrivate this problem.

Dean



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SamMI

06-28-2006 17:38:34




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 Re: Ford 671 PTO won't stop in reply to ScottSD, 06-28-2006 07:53:28  
I would not dispute what LCKS has said, however I have rebuilt several SOS units. What I have done is set the preload on the PTO shaft timken bearings on the tight side. As the bearings wear over time the preload opens IE the shaft becomes more loose. This has worked for me. This assumes of course that the clutch plates still can separate mechanically at zero pressure. This could also be done by spliting the tractor and removing .003-.005 of shims.

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SamMI

06-28-2006 17:42:42




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 Re: Ford 671 PTO won't stop in reply to SamMI, 06-28-2006 17:38:34  
Opps; I meant NCKS (Larry) in my message. Larry, please post back your thoughts on my suggestion above. Thanks, Sam



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Larry NCKS

06-29-2006 01:48:15




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 Bearing preload in reply to SamMI, 06-28-2006 17:42:42  
Long's the bearings aren't so tight they burn up under load . . . I guess it could help. I'd think they'd have to be awful tight though, to act as a brake. I guess the long and the short of it is that I would not recommend preload out of spec on these.



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Keith Weber

06-28-2006 11:36:18




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 Re: Ford 671 PTO won't stop in reply to ScottSD, 06-28-2006 07:53:28  
I've used 3 different 801 SOS and two of them had drift on PTO. I'm sure there is some adjustment for the clutch because I remember one of the 801's had a shim chained to the PTO pull so that when you engaged it you put the shim in place to keep it fully engaged. I guess the cable or somthing was week and the pull would slowly work it's way in to a point wnere the PTO would slip. When working with most PTO driven equipment it is allways a good idea (absolute must) to shut the tractor off before cleaning it anyway.

Keith

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Fordfarmer

06-28-2006 10:37:50




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 Re: Ford 671 PTO won't stop in reply to ScottSD, 06-28-2006 07:53:28  
I used to have a 971 with the same condition. Our local Ford mechanic (complete Ford training, including S-O-S trannies, and lots of experience) told me that there isn't a brake, but the problem could be lessened or maybe (temporarily) eliminated by rebuilding (I hope I'm remembering this right) the pto clutch. There are some parts that get worn, allowing the pto to 'drift', but still transmit full power when engaged. He said most people just ignore it, and it probably wans't worth the cost to fix it.

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Wayne in Tx

06-28-2006 08:23:19




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 Re: Ford 671 PTO won't stop in reply to ScottSD, 06-28-2006 07:53:28  
I have a Ford 4000 1963 w/SOS, same as an 871, and there is not a PTO brake. The situation you describe is "normal", in my experience. I have tried to adjust the cable control to eliminate the condition but, I have never been successfull. There are several experts on this board that are much smarter on the SOS than me, maybe one of them can educate both of us!

Wayne



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Larry NCKS

06-28-2006 11:36:38




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 Re: Ford 671 PTO won't stop in reply to Wayne in Tx, 06-28-2006 08:23:19  
What both of you are experiencing is normal for the SOS and indeed any hydraulic clutch application that does not hav a brake. There is enough hydraulic drag on these clutch packs to make thewm turn when not loaded.

Sorry, but there is absolutely nothing that you can do to these to make it go away. New clutch discs will not stop it.



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ScottSD

06-28-2006 11:53:34




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 Re: Ford 671 PTO won't stop in reply to Larry NCKS, 06-28-2006 11:36:38  
I guess knowing there is nothing that can be done about it is better than digging into it and finding out nothing will fix it.

I've got my eyes on a Ford 515 sickle mower in which the sickle bar can be lifted even with the PTO on (so I read in another thread on here) so that might not make a difference.

Thanks for all of the great input! I like this site. It is chock-full of very usefull information.

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Rexalot

06-29-2006 11:57:39




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 Re: Ford 671 PTO won't stop in reply to ScottSD, 06-28-2006 11:53:34  
My 871 does the same thing. I even adjusted the cable like the manual explained.

Not a problem for me.



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