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Higher rpm leads to more air being moved lifting dirt, sand and debris causing excessive wear and not from the act of cutting grass. Usually it’s the wings on the back edge of the blade that produce lift that wear out first. I had the same problem and corrected it by raising the deck a little higher. Blades now last nearly a full season. I even tried hard facing the blades but it wore out next to and in between the welds. Since raising the deck my grass is healthier, looks better and is more drought resistant.
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