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Ford Tractors Discussion Forum

871 SOS

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Mike Fernandes

08-18-2012 18:28:59

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Aloha I am about to purchase a 871. The problem is the SOS doesnot have first and third. Could there be just a minor adjustment to be made. All the other gears work. Need help Mahalo Mike

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Larry NCKS

08-19-2012 12:55:08

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 Re: 871 SOS in reply to old, 08-18-2012 18:28:59  
Bet you can't show me a C3 cam with 2 lobes worn or broken off and two intact :o

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Larry NCKS

08-19-2012 06:02:27

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 Re: 871 SOS in reply to Blindhawg, 08-18-2012 18:28:59  
Mike, 1st and 3rd will not stand alone as inoperative. My guess is 5th and 7th are not there as well. If you find this to be the case, C3 (clutch 3) is not applying.

The only way 1st and 3rd could be inoperative without affecting other ratios is if the lobes for both of them are worn off their cam at the control valve body. I've never seen this happen, nor have I ever heard of it happening. Furthermore, having grown up with SOS, I can not conceive of this scenario as even a remote possibility.

Any clutch or band that malfunctions in this transmission will affect at least 4 ratios, minimum. ORC/DDC or B1 failure will affect at least half of your ratios.
This post was edited by Larry NCKS at 06:24:26 08/19/12.

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Gene Sage

08-19-2012 09:23:56

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 Re: 871 SOS in reply to Larry NCKS, 08-19-2012 06:02:27  
I can show Larry a control valve with a lobe broken. I acquired the 4000 D SOS from an owner who had spent $3,500 on the SOS and it still didn't work. The Bozo that worked on it shouldn't be allowed to own wrenches. Upon opening the SOS we find inside remnants of a shop rag, 2 thrust washers, and a snap ring on a cluitch pack not in machined groove. We replaced all orings, seals, clutches, bands & rings. Still didn't work. Bozo had replaced control valve with one from a ORC model. Sure to drive you nuts. Pressures on the three guages did not make sense. Works like a charm now. Has to be the most expense 4000 in the country. You can see pics of it in "tractor photos" Ford.

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08-18-2012 19:23:49

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 Re: 871 SOS in reply to Mike Fernandes, 08-18-2012 18:28:59  
might give john smith's sos troubleshooting a read.

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08-18-2012 19:10:45

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 Re: 871 SOS in reply to Mike Fernandes, 08-18-2012 18:28:59  
Three problems with selecto-speed 1-it's complex 2-most guys that knew how to fix them are retired 3-There are a lot parts Ford doesn't carry anymore. You'll need to get the appropriate repair manual for your tractor and the tools (gauges and fittings) to do any trouble shooting. Perhaps one of the retired guys or even someone with gray whiskers can chime in and tell you if first and third are on the same band or servo. I went into a 4 cylinder 2000 SOS about 28 years ago to do some minor repairs, the only reason I was able to get the parts I needed was our dealer bought them for someone 15 years earlier and they never picked them up, they gave me a gentle reminder not to screw up putting it back together this time 'cause I had the last new parts I'd get.

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