Depends somewhat on the mower deck you have on it. Here is the owners manual section on replacing the belt. I have the 38C on mine and I think it is the spring that sets the tension on it. If it is slipping you might need either a new belt and/or tension spring replaced on the rod that pulls the idler pulley against the belt.
I think the freedom 42 mulching deck was the only one with a threaded bolt adjustment that can be made.
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