Not being mechanically inclined your probably best served making the simple checks such as the belt being tight, not broke or slipped off the pulleys, etc. If nothing obvious shows up there, then taking it to a repair shop. They are not terribly complicated yet there's a fair number of small parts, washers, clips, pins, and gears internally that have to be disassembled and reassembled in a specific order and rotational direction for them to work proper.Would be very helpful for a illustration or explanation of how my self propel works. Manual from toro is not clear to me. Not mechanically adept.Thank you.