Wide mower with multiple blades not cutting properly

I recommend you study what tensions the deck belt. Does the whole deck shift back and forth to tension the belt? I'm not familiar with any that do that, but engineers can be creative.
if i remember correctly, it moves backwards into tension when when the deck lowers,
 
by the screetching sound i recon the blade brake is insufficiently disengaging. But i dont see any way to adjust it. I could remove it but…
Is there supposed to be another spring attached to it in the opposite direction?
 
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