James,
I have had mine apart for cleaning/regreasing and did not have a problem, but I would caution against moving the shaft. Does it have play? If so, you probably have an issue at the other end. If not, using a puller will tension the shaft in the box and I don't think you want that either. I would also check the bearing against the old one to make sure they are exactly the same width, Mercedes might just have more than one bearing for this application.
Best,
g
'64 230sl, fully sorted out...ooops, spoke too soon