SOS question (More Info)

jeff pk

Member
So here's the breakdown: Early SOS trans runs normally in
R1,R2,1,2,3, and 4. Goes to neutral in 5,6,7, and 8. Runs
normal in 9 and 10. Did a little research on John Smith's site
and that is pointing me toward a Band 2 adjustment.

Does that make sense to the resident SOS experts?

Thanks for the input...
 

you can try that - but I'd bet on the failure of the little steel pin that pins the sequencing valve to servo three.

15190.jpg


If you have a service manual, carefully follow the instructions to remove the interlock cover on the left side of your transmission. You can replace this little pin without removing servo 3 if you do it carfefully.
 
I will try that if the band adjustment doesn"t work. Can that pin
be replaced with a suitable sized drill bit cut to fit? I"m
assuming that the part is not available from the store. Thanks
for pointing me in this direction--- I would never have figured
this out. I don"t know what any of these components do,
except that when they"re all together and working properly they
move my tractor...
 
I think the last one that I did, I actually bought a pin from my CaseIH dealer and had to cut it for length. It is a light press fit in the end of servo 3.

The pin does show to be available on Messicks website. The part # shown is 378188S for $5.20. You'll also likely need gasket #C3NN7C346A for $26.11. There may be one or two other o-rings you'll need as well. One I'm specifically thinking of goes on the inlet strainer body.
 
Rwplacing the pin is straight forward. You should be able to complete the job in a couple of hours or less.

Be careful removing the interlock assembly. It will likely be well stuck to the transmission case. DO NOT drive a wedge between the cover and the case at a tab or ear. Doing so can break off part of the cast cover.

You will need to order a gasket from CNH. Order the pin at the same time.

Dean
 
Thanks Dean. You wouldn't have a part number for that pin would you? Found the cover gasket number, but can't seem to isolate the pin...
 

Jeff - did you read my last response? It was ahead of Dean's and included both the gasket number and the pin number! LOOK AGAIN!
 

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