I am not sure, but DC motors will run backwards if the polarity of the incoming voltage is switched. I see this is an AC motor but they always run forward no matter the polarity, unless the polarity is reversed to the right wires inside the motor. The second link has a discussion on exactly how to do that. Thus it may have your answer, that those wires got switched somehow on your motor. Which means you need to buy a new motor.
http://www.aqua-man.com/row_num.asp?Ic=1133
http://cr4.globalspec.com/thread/26099
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