I bought a used 19" Craftsman electric mower. I mowed one lawn with it and it was OK. I started to mow a second lawn and it was no longer cutting. The motor was running but the grass was not being cut. I turned it on its side and observed that the rotary blade is turning backwards (clockwise), meaning the dull edge of the blade is contacting the grass instead of the sharp edge. That's not right, is it? What would cause this to happen all of a sudden? The first lawn was cut just fine, so it must have been turning in the correct direction for that one. Thanks.
