Make sure it's UNPLUGGED! (RALOL)
Seriously though, go to this website,
http://www.ereplacementparts.com/dewalt-dw505-type-hammer-drill-parts-c-1009_9661_2280.html
they have an exploded view of your drill that you can download; it's in a pdf format; the parts are numbered so you can easily identify them. They even have the manufacturer's part number listed in case you need to order a replacement part.
The illustration will also come in handy once you take the drill apart and you have to put it back together; especially if you have to walk away from the project for several days- waiting for the replacement part(s).
I would suggest having a large- private work space to take the drill motor apart on; where you can neatly separate the pieces and cover them, should the need arise to leave them as is, in a disassembled state; free from the kids or wife (not on the dining room table where you know someone will tamper and move things around- saves on arguments, too!
Best wishes on your project- be well.
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