Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Here is workshop manual. Page 6.6 starts the mower deck belts.
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You have a bad bearing in your spindle,. The spindle is letting the blade run at an angle. The bearing has failed and is not keeping the blade shaft straight. Causing the scalping and the noise. Sorry, I have been out of town!
Did you check and turn each blade, to see if one of the spindles was bent? Blades should all be level and measure same distance from top of blade to inner deck. With blade cutting the gouge in the lawn, spindle is bent or the blade is on upside down!