Oracle Sun Server X4-4 Service Manual page 231

(Optional) Install the Server Into the Rack
The server cannot be slid past the slide rail stops. If correctly installed, the server should slide
easily. If the server does not slide easily, it might not be inserted properly.
To unlock the server and slide it into the rack, simultaneously pull and hold the
5.
green slide-rail release buttons on each mounting bracket and push the server
into the rack until it locks into place flush with the front of the rack.
Returning the Server to Operation 231