You have to determine if it's a mechanical problem with the motor(bearings) or it's mechanical load(locked up) if not single phasing.Then determine if it is a short in the motor windings or the circuit that feeds it.
What type of starter electronic(SCR)controlled or other.
How you go about trouble shooting depens on whether you have a meger or not.
Could be anything including a short in the run from the starter to the motor.If everything else checks out disconect the wires at the motor then the load side of the starter and see if it pulls-in and holds each time.Disconnect the motor from its mechanical load before you order the new motor for sure.
[This message has been edited by frank (edited 11-01-2006).]
