The adjustment is described right on the mule drive.
The two pullies should be more or less in line with one another when properly adjusted as per the notch and diagram on the mule drive.
What size is your deck drive pulley?
There is a 4-1-2" pulley and a 5" pulley
4.5" pulley takes the IH-59971-C1 belt 3/8 x 78
The 5" uses a IH-117465-C1 3/8x79
You may have a deck from QL
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