"We bought 2 TB 80 EC trimmers this year. Neither one lasted longer than the first gallon of fuel. The gear housing by the head got hot on both very quickly. Neither unit ever sounded as though the gears were operating correctly. The heat produced on one unit got hot enough to melt parts of the plastic head rendering it useless. On the second unit, some of the gears stripped out. When I disassembled the gear housing on both units, I found rust on the bearing surfaces. I found this odd as I've only owned the units for about one month and have always stored them inside."
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