A bearing separator as George mentioned is what you need. Any place that has a press should have one and can help you.
I also would recommend installing a new bearing if you have the old one pressed off.
Here is a picture of one.
http://www.zorotools.com/g/00057375/k-G3325567?utm_source=google_shopping&utm_medium=cpc&utm_campaign=Google_Shopping_Feed&kw={keyword}&gclid=CIzg4J6T17UCFYpDMgoddhoAog
