Turn the Craftsman product upside down to access the engine or motor.
Open the case that covers the engine or motor. Most craftsman tool engines or motors are covered with a thick plastic shell that prevents it from getting dirty and damaged. Open the case with a screwdriver to remove screws and pry doors open.
Look inside the engine or motor to find a white metal tag attached to one side. The tag will have a bar code.
Read the numbers on the engine or motor and write them down so you can have them for servicing purposes.