717-3375 Clutch, PTO | CVX Style; (Tractors with serial no. 821,060 thru 851,000)
717-3389 Clutch, PTO | CMS Style; (Tractors with serial no. 851,001 & Above)
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717-3446 CLUTCH ASSY-PTO used on tractors like a 2180
My guess is that someone replaced the clutch with a later style like what goes on a 2180 along with a lot of others. Tip for you when you're looking to buy parts is to Google " Cub Cadet
part number" like in this case Cub Cadet 717-3446. Here are pics of the 2 styles. I've been using the clutch's made by these guys lately.
https://xtremeope.com/
As Mike mentioned it's not a big deal to replace the bearings. Here is a thread on how to do it.
http://www.onlycubcadets.net/forum/s...ad.php?t=24413