You will need to loosen the screw on the fan shaft and adjust the motor. Make sure it is not scrubbing then tighten the screw. This can be a two man job.
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are you refering to the the screw at the center of the motor itself? or are you refering to the screw above the motor that attaches the motor flange to the housing?
if the center screw, it looks as if it has a compression washer holding the shaft within the motor. Please help.