So I had to do some digging… This appears to be the Craftsman 5200 based on the pictures: https://www.sears.com/craftsman-48-in-turn-tight-174-hydrostatic-garden-tractor/p-07120407000P?sellerId=SEARS&prdNo=1&blockNo=1&blockType=G1&sid=I0084400010000100600&aff=Y&PID=4195712&AID=11569691&utm_medium=2306911_4195712_11569691&cjevent=c539da7f897d11e981eb01db0a24060b#
From that webpage, I found the operator’s manual: https://i.sears.com/s/d/pdf/mp-tc/10091727/prod_2333481712
On page 27 of the pdf on the operator’s manual, you’ll find a section called “To Replace Mower Blade Drive Belt” with the following diagram of the belt routing:
[image|1783753]
Of course, this is all assuming that my digging is correct, and your riding mower is model# 917.204070 .