2010 8320RT.  The fan drive was replaced at Deere a year or so ago(used tractor and the fan drive was shot).  I've watched all the videos and read every thread I can find about doing this for every vintage of tractor that has them.  There are no plugs on my top or bottom sheaves.  None in the sheaves and non in the end of the shafts either.  What am I missing?  Are they replaced with non-serviceable parts?  There was a little grease around the bearings under the big rubber boot on the top one.  Do I need to take the back sheave apart further(splines inside)?  

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