Here is what happens to an electric mower when dirt and debris falls inside the motor assembly. I discovered this failed mower motor when troubleshooting the electric mower. Electric mowers might need less maintenance and upkeep than a gas mower, but they do need to be cleaned and taken care of to make them last.
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https://lawnmaintenancetips.com/mowers/pt-2-how-to-cut-tall-grass-with-a-basic-lawn-mower-tall-grass-mowing