Windshield wiper motor

Anyone had experience getting the windshield wiper motor out? My wipers will only rotate about half the arc they should and at a slow speed. Without the blade on, the shaft rotates a full arc and speed. I've looked for binding of the drive tube, but wonder if the motor itself is the problem. Trying to get the motor out from the front is a bear. Do I have to remove the dashboard to loosen the motor clamp? Any other advice on wiper motors?
 
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