Apple Xserve (Early 2009) - Manual (Page 31)

31 Chapter 2 Installing or Replacing Components
4 Loosen the thumbscrews at both ends of the front panel.
5 Grasp the thumbscrews and pull the Xserve forward until the safety latches engage
(about halfway out of the rack).
Latches
Thumbscrews
6 When the safety latches engage, grip the Xserve where it emerges from the rack, press
down on the latch tabs with your thumbs, and slide the Xserve the rest of the way out
of the rack rails. Set the Xserve on a flat surface.
7 Loosen the thumbscrews at the back of the top cover and slide the cover back and up
to remove it.
If you have difficulty removing the cover, check the enclosure lock on the front panel.