This Dewalt router is not easy to take apart. I think your bearings have seized up so I would recommend you replace the bearings 868768-03 and 330003-05. These bearings are very inexpensive.
Here is a breakdown of the Dewalt Router for some guidance. http://www.dewaltservicenet.com/Products/DocumentView.aspx?productid=33203&typeId=7557&documentId=21070
Good luck!
Don- www.toolsandmachinery.com, December 2009