I have been shearing teeth off the main gear of the HDX 500se pretty much every day I fly her, without explanation, usually when bringing her up to speed while the rotor was already turning. I had read that the main gear one way bearing can get gummed up and lock once in a while causing teeth to grind off. When I replaced the main gear this time, I took the one way bearing out and soaked it in acetone, shaking it and the bearing. I was amazed how much crap came out as I cycled through the washes. Then I dried it, and soaked it in silicone lubricant, and reinstalled it. It actually turns much cleaner. Looking forward to seeing if it solves the problem!
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