A video of this procedure is available at YouTube: https://www.youtube.com/playlist?list=PLYV5R7hVcs- 
BashWCNZQEDP7o3EohXPEV
. 
Procedure
Step 1.  Loosen the two thumbscrews located on the front of the server to disengage it from the rack. 
Rack front
Figure 13. Disengaging server from the rack
1
Rack latch
2
Thumbscrew
Step 2.  Hold the mounting ears on the front of the server; then, slide the server all the way out until it stops. 
Figure 14. Pulling out the server
44 ThinkSystem SR655 V3 User Guide