on the metal shield of the motor there should be stamped numbers. they would be the model and serial number...without them it would only be guesses on advice.. and most likely wrong.
it could have a point system, transistor system. electronic system..and on and on..it like saying you have a car and something is wrong with it...without us being able to put our hands on it, how can we tell what you have.
I am not trying to make it hard...but what you are asking is.