What is the model number on your snowblower? I wasn't able to find a manual using the serial number. I reccommend that you search the model number on the Sears website . They have a large selection of manuals.
I also have a Canadiana Snow King snowblower that I bought at Sears. Sears has provided parts for me so they might be able to provide a manual. My manual lists Signature as the primary company so if you contact them they might be able to help.