I just started using my Troy Built Model 830 5.5 hp self-propelled mower and it works fine without a load; however, the belt is too loose to cut grass. I don't see any adjustment for taking the slack out of the belt. I bought this at Home Depot about two years ago, but just tried to use it when my rider fuel filter plugged. This mower is junk unless the belt can be tightened. H E L P!!