Pack the new bearing with grease first, then use the bearing spacer to knock the bearing into place. Note that there are likely shims on the end of the bearing spacer....you may have to adjust the shims for the new bearing although in reality, bearings are usually a very tight spec, and there is not a lot of variation in tolerance between them. Refer to the manual on how to adjust the bearing with the shims and a dial gauge.
Some early vehicles did not use the spacer, but rather the nut on the end of the axle shaft did the adjusting. I ran into one of these a short time ago when I was salvaging parts for another truck at the local museum.
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