SOURCE: blades stop working
Does your mower have an electric clutch ? If so your problem is most likely a connection
SOURCE: Knocking in mower deck or belt clutch when engaging blades, motor bogs / slows down
YOU MAY HAVE A BENT BLADE OR EXESSEIVE BUILD UP UNDER THE DECK
SOURCE: the engine run rough and backfires when deck is lowered with pto
It sounds like your blades may be restricted when you lower them. A possible solution for this problem would be to remove the mower deck and clean out all the dead grass buildup inside the housing.
SOURCE: Engine runs fine til hot.
I think one of the intake valves, or a valve pushrod, is bent or warped. When the engine heats up, the metal expands and the valve starts sticking open. That would cause compression to be lost in one cylinder, reducing available power so things drag when you engage the blades. This would also causes air/fuel to be blown back through the intake. I think you'll need to take it to a small engine mechanic. Good luck! Please rate my solution if helpful, thanks.
SOURCE: Mowes unevenly. Blades don't match up.
I would say the mower deck is warped Invert deck lay strait edge along blades shim bearing housing and or straiten deck.
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