My 1538 Hydro (model lt150h38lbv) keeps breaking deck belts after about 1 hours running. My last snapper belt lasted 45 minutes! Last use belt started to smoke at the front and then jumped engine pulley. I routed it over the belt guards instead of between them and engine pulley and this seemed to help. In deck position 1 thru 4 blades turn but in position 5 and 6 blades are getting no power. I replaced the engine 2 years ago with a "drop in" 17hp Briggs and I hate to not keep it just because it loves belts for lunch!! Any ideas greatly appreciated.......Greg