wheels won't turn
I have a Yard Machines (MTD) model 31AS6FEE729 snow thrower, about 7 years old. It starts fine, always has, but when I tried to use it for the first time this season, the wheels won't turn when I engage the lever to propel it. I examined drive and auger belts and they seem fine. I adjusted tension on drive control, but that didn't help. Thoughts? Thanks.