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F-20 overdrive oil seal

S

SW EM

Member
I restored this tractor last year yet it leaks constantly leaks from the overdrive oil seal on the front cover. It is the Behlen-type overdrive, but nowhere does it say "Behlen" on it. I believe it was made by sears, but I could be wrong. There are no words on it.
When I had the overdrive apart I replaced the original oil seal by measuring the I.D and O.D. It was trial and error until I found one that felt right. Since then it had always leaked from there and the U-joint throws oil everywhere.
My question is, is there a correct replacement out there or do I need to keep trying different oil seals. Any input on what you have done would be appreciated.
 
Here is a pic of what I'm dealing with
c143238.jpg
 
It appears as though that is the Behlen where the lower shaft is splined and fits into the lower gear. Since I have been in the same situation, I would consider using the CR 17310 as I believe it has a .003 larger OD than the 17300. My first seal started to spin slightly in the case or the larger OD fixed that. This may or may not be contributing in your situation.

Second, very generously use RTV Black on the "transmission joint washer" or the piece of stock that the retaining bolt presses on to hold the yoke in. Additionally, I also put a slight amount of RTV on the last half inch of the splines in the yoke as a last resort. Warning: it can make it difficult to remove the yoke if you RTV the splines! This held for a few hundred miles as I used to do a lot of tractor rides with my F-20. Good luck!
 
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