Help needed with 1/2hp sewing machine motor
Motor bearings are almost always pressed in. They can be a real bear to get out, sometimes a bit of heat applied to the outside of the bearing race can help.
As noted, just about the only way to remove a bearing from a motor shaft is with a bearing puller. If you don't have a press to get it back on, use a deep socket that fits over the shaft and contacts the inner race of the bearing, (but not the seal part) and lightly pound it on using a wood block for a cushion. Be careful to not ruin the other end of the shaft, placing it on a wood block helps a lot.