The old hub needs to be pressed into the center of the new bearing and the whole assembly then pressed into the carrier. I've heard tell of those that have pounded it back in, but I've had too much corrosion in the hub--Also, its and interference fit of a couple thousands of an inch so hammering could bung up the new bearing pretty easy.

__________________
Mark
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THE WHITE FLEET
2016 GLE300d 4-MATIC 38K BROWN!
2012 S350 Bluetec==94k WHITE

2007 ML320 CDI==166K WHITE (FOR SALE)

Under new management:
2005 E320 CDI--140K--WHITE
1995 E300-Diesel-133.5K--THE CAR IS BLUE
1986 300SL--97.5K (European) AND WHITE. Back in Europe!
1991 190E 2.3-73K California Perfect.--WHITE
1995 E320-Wagon-159K--WHITE (recently scrapped)
1987 300D Turbo-213K--WHITE
1987 190D 2.5 Turbo-288K--WHITE