Ok, so you're talking about the main, not rod bearings.
I think that "pin" in the diagram simply pushes the main bearing around. Note the direction of travel vis a vis the notch on the end of the bearing (right, lower).
You can probably use one of the bearing shells out of the cap as a pusher to get the upper bearing shell moving around and out. Then when both are about halfway, one in, one out, you should be able to grab them and they should be loose enough to remove by hand. Use oil to assist in the movement, and spin the crank as necessary to assist in the turning.
Just my 2 cents. Never did this on a Volvo engine.
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