It is possible to get the seals out without complete disassembly, but,it may require some ingenuity. First is a dust seal that is easy to get out. Then there is a snap ring. The next piece is a spacer with a needle bearing in it , o-ring on the inside that seals on shaft and o-ring on outside that seal on housing. Problem is to get a hold of that spacer. If it has a shallow hole drilled and tapped you can pull it out with a bolt or slide hammer. If it does not have any holes, well, that is the iffy part. I have had several apart but normally for other reason so take them all the way apart. That can be a problem also as the spool inside is a very close fit to housing and spool stays with the shaft so careful does it. The CaseIH online parts manual shows a breakdown of the unit as used on a 400 tractor for instance.
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