I have a craftsman lt1000 riding mower, I have no belt diagram, and belt is loose blades want turn, Does anybody know how to adjust belt, My grass is getting high thanks

Belt does not need "adjusting" there is a problem with your idler , (engagement) pulley, or springs. The problem is on the deck itself. Belt may be stretched, but no adjustments.

The belt has a tensioner that gets clogged very easily. Deck must be dismounter and this spring loaded tensioner freed, otherwise there will be no tension on the belt. This mower is a repair bill looking for a place to happen.