Anonymous-0
Well-known Member
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
- Thread starter Anonymous-0
- Start date
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.
Larry NCKS
Well-known Member
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.
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.
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.
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.
Larry NCKS
Well-known Member
Bet you can't show me a C3 cam with 2 lobes worn or broken off and two intact
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