Why are my tires locked up?

I have a craftsman yt 3000, 21 hp mower and have this problem. It will not roll, the tires seem to be locked up so I jacked it up and the tires spin freely, one in one direction the other in the other direction. Any idea what I've got going on?

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It's very likely that it's related to the transmission or the drive belt, not the tires.

Here's some more info:

http://www.mytractorforum.com/14-craftsm...

  • Check the clutch/brake travel. Are you sure you don't have the parking brake set when you are checking belt tension?
  • Do you have the little finger thingy sticking out of the rear plate that allows you to push by hand. Is that out or in?
  • It's possible that the pivot for the tensioner has rusted up, if it's been sitting. Getting under and eyeballing it should tell you.

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the drive belt looks to be in place, why would the tires spin in opposite directions?

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Because differential gear boxes : https://www.youtube.com/watch?v=SOgoejxz... which are universally present on vehicles that have more than one drive wheel.

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