What should I do if my Troy Bilt TB30R mower blade starts vibrating excessively?
If your mower blade is vibrating excessively, first check that it is tight and properly balanced. Grind metal from the heavy side of each blade edge equally to maintain balance. Ensure there are no cracks or damages on the blade spindles. If issues persist after inspection, replace the blades immediately (Page 30).
From the official Troy Bilt Tb30r manual, page 30
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