Remove the nut , the snap ring and hit it with a hammer.
And you can google / images and type in what you want to see.Lower ball joint for an 87 Mercedes?Like most cars, you need a ball joint separator. Mercedes has a special tool for nearly all suspension part replacements. A creative technician should be able to figure something out. You might try a frame shop, but bring your own genuine MB part with you. Anything else is not made to as good a standard. Good Luck!!