Heat.
Warm the bearing, not the crank, with a torch.
If it’s the PTO side, expect smoke as the retainer is plastic.
Bearing puller best, but a 2 jaw with work.
When I assemble, when the Fly side bearing soaks up the case heat, the crank will drop right in. Then if it’s cold enough, it goes outside while I do something else and setup gasket. Do the PTO side bearing and let it soak up the heat, and the case side will literally drop onto the crank and assemble/mate to Fly side.
It’s not heat or cold per se, it’s the temp differential. If they are both hot or both cold, the interference fit will stay the same.