I just joined this forum and I have been experiencing the same issue on my 2015 Craftsman T2200.
The belt controlling the blades has come off the pulleys occasionally since new but since it only happened five or six times a season I had not done anything about it. (it pops back on easily)
I recently went to the Sears parts store and we went through the detailed manuals and they advised that there is no adjustment on this model. I bought a new belt so we will see what this season brings.
Sears Craftsman DOES NOT make their riding mowers !! They are made by other companies and "branded" as
Craftsman ... I'm pretty sure that Husqvarna makes all the newer models. Over the years there has been maybe 20 or 30 different companies making Craftsman mowers.
with that said... Craftsman has their own way of separating different versions of a certain MODEL ...
click on pics enclosed ....... these are used as examples
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the 917-XXXXXXXXX number is what defines ....... a specific version...of a specific model
T2200 is an INCOMPLETE model number ... locate your ID on your machine ...THEN... give us the information WE NEED to help YOU ..!! WE have to find the MANUFACTURERS manuals to see IF we can LOCATE the information needed, ... to remedy YOUR problem !! If you have problems locating YOUR model & serial numbers... CALL Sears
they are very willing to help ( most times ) Look at MY mower information below ...( mine is a Murray) and your Craftsman wont have all that info.. but give us ALL you can info wise...HELP us help YOU !!!