I have the exact same mower and it does have a safety interlock that prevents it from running in reverse with the blades engaged and starting it when the pto is engaged. pull the lever for the pto to the off position and you can restart it then, and if you are running with the blades engaged and want to back up disengage the pto before trying to back up and you will be fine. this are some of the new safety items that are incorporated into mtd built mowers and bolens is built by mtd. mike
mike twofeathers, May 2008