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Okay, 3 years late on the advice but I figure someone else will encounter this problem. I had this same problem of the belt being too loose. There is a grease fitting on the pivot for the tensioner pulley that you can't see with the deck on. I had never lubed the fitting so after about 5 years the pto belt would stay loose. I removed the bits, wire brushed the rust off, greased loads, reassembled. Now I remember to lube that fitting once a year. The pictures in the manual on lubing are of little help. Another problem is adjusting the deck brake. If it were too tight, you would smell it quick and it would get very hot. You can see this from the side. ENGINE OFF, deck down, pto on. There should be visable room between the brake pad and the deck spindle (double pulley). Shortly after I got my new 1320, (1990) it was recalled to replace the deck brake. I guess it didn't meet federal safety standards. I recently had to replace the deck double pulley due to shot bearings. My advice is to replace the brake at the same time with the proper mode. The newer pulley has larger bearings and is just enough different so when combined with the worn brake pad, it ate pto belts in minutes.
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