Wheel Bearings coming loose

Bad Sport said

What process did you use to tighten them? If you didn't preload them, install the castle nut and cotter pin it they will loosen.

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Not sure about the preload part. How do you do that? Packed bearings with grease. Used FSM procedure as stated. New bearings and races. Used the slotted washer. Races properly seated. Castle nut and cotter pin in place.