This is our most frequently asked question. Generally speaking, the number is on a small silver tag on the main blue frame of the machine. The number is not on the motor. With a few exceptions, the motor number is useless to us. Always have the serial #'s (for example: JR 5555, C-1776, M.V.P. 1530, SSB 1999). Having the serial number when you call will help us solve your service needs in a timely manner.