Hi [NAME],   It might seem that the rail is not compatible with the depth of the rack. Is the rail on the R430 the same part#?    Attached the rail system compatibility matrix and measurements: [URL]
Good day, I’m having a problem right now installing the Dell R340 in a network cabinet where I can’t push it enough so the server will click and lock into its rails. The measure of the front rail post from the rear rail post is ~660mm. There is another server installed below our allotted slot specifically PowerEdge R430 which just sits fine. Is there anything we should adjust with the rails that we could do to lock the server to the rails? Or any workarounds from this problem? The picture is where you can see our server R340 and R430 from top to bottom respectively. Thanks.
PowerEdge R340 A12 ReadyRails II Server Rack Installation Problem