The pilot bearing is also exposed to any dirt and moisture present inside the bellhousing. I would strongly recommend that you inspect it and consider replacing it any time you have the transmission out of the car -- certainly whenever you replace a clutch. It costs only a few dollars and is readily available from most Volvo parts suppliers.

There are a number of tools and techniques used in extracting an old pilot bearing -- I use a slide hammer, which is primarily a body working tool. Check your shop manual for suggestions on how to replace this important part on your particular Volvo.