http://farmallcub.com/rudi_cub/www.cleancomputes.com/Cub/Cub%20Parts%20Manuals/TC-37F%20Revision%206%20(08-79)/Group%20-%2012%20-%20Power%20-%20C-60%20Engine/Page-10.jpg
At the recent Barnyard Bash, I noticed an engine sitting on a pallet with the oil pan off, and realized it was a great opportunity to show both the front part of the pulley you are looking at during installation, as well as the rear (inside) end of the pulley. So I snapped a few photos. Hope these help you if you are doing this in the future!
The first photo shows the area of the pulley shaft that has a reduced diameter and would normally be bright and shiney, since you would have cleaned the shaft since it rides on the seal. There is between 1/8-1/4" (sorry, I didn't measure it) gap, which often leads folks to think the pulley is not fulley seated. For reference, you are looking from the bottom of the engine, with forward to the right.
The 2nd photo is from slightly aft of the first, so you can see the shaft of the pulley is hard against the Crankshaft Pinion (gear). This also would have been nice and shiney for a seal replacement.
The last 2 photos are two closer views of the outside rear of the pulley, just to give you a better look at the remaining gap between the wider portion of the pulley and the engine cover.
As I said, I hope these help you if you ever need to tackle a front seal replacement. Don't forget that the manual says to leave the cover loose (bolts not tigbtened down) until you have installed the pulley, allowing the cover/seal to center itself on the pulley.
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