After the bearing/hub is correctly repacked and reassembled, the tire/wheel is rotated by hand while torquing the nut to 12 ft lbs (depending upon the size of the bearings, of course).
If the keyway lands "between the grooves" ya continue to tighten to the next groove and until the key can be inserted. Under no circumstances should the preload be released and if assembled this way, they will darn near run forever.
That old fashioned "back it off" theory is a hand-me-down from the days of ball bearings and is an absolute "death warrant" for a tapered roller bearings. They will then in time and with use, wear/loosen and the entire load only rides on the "edge" of one roller at a time instead of being distributed evenly across the entire bearing surface(s).
I dunno. Trouble is, 'bout 80% of the guys with wrenches still back 'em off just as they did all those years ago.
I should have stood there and watched them do the job I guess. :>(
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