HP ProLiant DL580 G3 Server - Manual (Page 39)

Server operations 39
2.
Extend the server on the rack rails until the server rail-release latches engage.
WARNING: To reduce the risk of personal injury or equipment
damage, be sure that the rack is adequately stabilized before
extending a component from the rack.
WARNING: To reduce the risk of personal injury, be careful
when pressing the server rail-release latches and sliding the server
into the rack. The sliding rails could pinch your fingers.
3.
After performing the installation or maintenance procedure, slide the server
back into the rack by pressing the server rail-release latches.