1928 Water Pump Dis-Assembly

Gentlemen-

I've posted a photo named "assembly_without_sprocket_Markup", and I

would like to ask the question in the photo. This may seem a little

elementary, but after removing the 3 bolts referenced in the photo (red

circles), I still can't seem to get that portion of the assembly apart

as I would have thought. I was hoping I wouldn't have to pull

everything apart out the back. Can any of you shed some light?
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