I purchesed a used lawn tracter mtd12/36 with a separate snowblower. I dropped the mower deck,have connected everything for the blower. It ran well. I shut it off,lowered the blade engagement lever one more time to check it before I put it away, the snowblower wouldn't engage.the lawn tracter is mod#139-612-000 c149b. The blower is model#190-491-000 io17d. :confused: