No, no.... this is not normal. There is a brake on the PTO that should keep if from spinning when it's off. Sounds like the brake is too loose. It is the 4 nuts that hold the square piece on the PTO. Just snug them up a bit. They should be tight enough to keep it from spinning, but not so tight that they engage the PTO. If it doesn't quit, you may indeed have a bearing going out.
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