This is normal, do not worry that harmonic vibration type noise just tells me that the unit has a full freon charge and is running great, sit back and enjoy
First level the unit as the compressor has oil in it for lubrication. Second a 4000 watt generator will carry about 13,652 Btu ac unit. You are most likely on the edge size wise. If you can borow or rent a larger generator check and see if the probm goes away.
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