I have a maxxum pro 80 bow mount and it has started making a knocking noise at all speeds. The prop shaft has a slight movement [back and forth]. I have tried a new prop & the prop is tight on the shaft. The motor is less than three years old and has minimal use.
Any suggestions what is making the noise.

Boating - Minn Kota - Maxxum Pro 80 Freshwater Transom Mount Trolling Motor With...