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sounds like you have something stuck on the blades. if not check to see if you can turn the blades by hand all the way around. its possible the spindle bearings locked up. (with the engine off)
if you do, you would have to figure out the new belt length and routing. It would be easier to just change the spindle. You could probably just replace the bearing but my guess would be the whole assembly would be about the same price on amazon. If you do change the whole assembly, make sure and keep your old spindle just in case you hit something and the caseing breaks.
The spindle bolts probably came loose and fell off. Look at the other spindle. Take one of the bolts (and nut) to the hardware store and get a matching set for the ones that were lost. Bolt the spindle back on - you should be good to go...
The bearings may be bad and freezing up, this will cause the belt to smoke and tear up as well as make the pulley wobble . Does it smell like burning rubber ?? If not then you have a pulley out of line and or a pulley that's cracked or broken. Also check and make sure the deck pins are all in place and the locks are down on the quick release on front and side of deck. While the blades are disengaged turn all the blade hubs (shaft spindles) and pulleys to see if the turn fairly easy. Check for play or wobble in the pulleys and blade hubs (shaft spindles), bearings and blade shaft attach to these pulleys. Also check the idler pulley(also called the tensioner pulley for wear and check to see that they are in alignment with each other). It may be a bad transmission shifter plate bearing. Check out this link for diagrams of your unit.
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Troy Bilt Parts
Those units are self adjusting. No way to adjust it. It sounds like you have a bad idler pulley or a bad spindle bearings, which would cause the pulleys to be out of alignment.
take the deck off or take the belt off of pulley there is a nut on top of pulley loosen nut with a brass hammer hammer it down & it should drop the spindle out to replace bearings
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