Adjust the flow channel center with the bearing gland gasket

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The book says that the center of the flow channel can be adjusted by adding or removing shims in front of and behind the bearing cover, but there are a few things I don’t understand. 1. Two ball bearings at the coupling end, installed back to back; their inner rings are locked in place with nuts, and then they are hammered into the bearing housing (an integrated bearing housing). There should be a step inside the bearing housing to hold the bearing seats in place, with a bearing cover used to press down on the outer rings of the bearings in order to achieve positioning. 2. Near the mechanical seal end, there is a roller bearing that serves only a supporting function. Is there a step inside the bearing housing for this roller bearing? ), a certain amount of clearance can be left between the gland and the outer ring of the bearing (I’m not sure if this understanding is correct). 3. I understand what the book says about tapping the shaft to create axial displacement, and then adding or removing shims accordingly; what I don’t understand is how displacement can occur when the inner ring of the bearing is fixed while the outer ring sits on the step of the bearing housing. The maximum amount of movement possible is just the axial clearance of a ball bearing, and in that case it’s only the shaft that moves, not the outer ring. So what’s the purpose of adjusting the bearing gland? Please help me understand this