SOS ORC and early failure

I was reading responses to an earlier post by James Wilson and a couple questions came to mind.

What was the point of having the overrunning clutch in the early SOS to begin with, and only in some of the gears? Was it mainly to provide smoother shifting?

My ford 881 has the ORC, and still works fine. What was the usual problem with the SOS that caused them to fail in the first few years? Why were some "bad" and others (like mine, hopefully permanently) "good"?

Thanks!
 

My opinions are: first, you have to remember that this was the first transmission anything like it. Things get built in incrementally better designs. Second, the owner's manual will tell you that it should have bands adjusted fairly frequently, and any work done requires lint free cloths. Neither was likely to happen on most farms.
 
1. Cost.

2. Cost (and decidion to not include oilfilter in original design).

3. Cost.

Dean
 
(quoted from post at 17:48:56 07/14/14) I was reading responses to an earlier post by James Wilson and a couple questions came to mind.

What was the point of having the overrunning clutch in the early SOS to begin with, and only in some of the gears? Was it mainly to provide smoother shifting?

My ford 881 has the ORC, and still works fine. What was the usual problem with the SOS that caused them to fail in the first few years? Why were some "bad" and others (like mine, hopefully permanently) "good"?

Thanks!

I think it was a bit simpler than including another clutch like the DDC. Furthermore, it was already being used in some other transmissions such as the IH TA.

As to why only some of the gears, it was the direct drive ratios that it facilitated which were fully half the ratios in the SOS transmission. The overdrive ratios were facilitated by the application of B1 (Band 1).

Why did they fail? Most of it has to do with the design of the ORC itself. Why were ther so many failures in the IH TA? When the ORC was not locked in, the drum around it was turning, therefore adding to its wear.
 
Hello Blair , All of the Gold Demo's and most all 1959 SOS's started out with a One Way Clutch set-up in them and the Valve body had Plastic cams that actuated the spools . The First major call back changed from one way clutch to Over running clutch and the cams went from plastic to steel and that is also when the filter kits were added in . The One way clutch did not hold as well as the Over running clutch just as the over running is not as good as the Direct Clutch units are . Just the progression of fixing problems that should have been fixed if Harold Brock had gotten his way and was able to put One Million test hours on them before they went out to the Dealers . Thanks Tony
 
Tony,

What's the difference between a one-way clutch and an overrunning clutch? They sound the same to me.

Plastic cams? Wow! Somebody should have been let go for that!
 
Hello Bern , As far as I can tell the spring set up in the clutch is of two different designs , since I have never seen an original one-way clutch that's all I can say from seeing pictures of them . I did how ever remove an original valve body with the plastic cams years ago . Thanks Tony
 

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