I have owned a Scag belt drive wb for a year and a half. When I make a left hand turn, I need to jump off my Jungle Wheels and push it to get it going again. The tension wheel is applying the maximum pressure on the top of the belt when I let go of the grip. Could it be worn out already. My dealer said they would wear out faster with a sulky but I can't believe they only lasted a year and a half on mostly smaller (10-15 minutes) backyards.