Dell POWEREDGE 1955 - Manual (Page 13)

Rack Installation Guide
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3 At the back of the cabinet, pull back on the mounting-bracket flange until the mounting
hooks are in the appropriate holes, and then push down on the flange until the mounting
hooks seat in the square holes and the push button pops out and clicks.
4 Repeat steps 1 through 3 for the rail assembly on the other side of the rack.
NOTE:
Ensure that the rails are mounted at the same vertical position on both sides of the rack.
Figure 1-5. Installing the RapidRails Assemblies
Installing the VersaRails Assemblies
1 At the front of the rack cabinet, place a VersaRails assembly so that its mounting-bracket
flange fits between the marks or tape (or numbered location) on the rack (see Figure 1-6).
The holes on the front of the mounting bracket should align with the holes between
the marks on the front vertical rail.
2 Install three 10-32 x 0.5-inch flange-head Phillips screws to secure the rail assembly
to the front vertical rail (see Figure 1-6).
rail-assembly mounting-bracket flange
push button
front of rack
rail assemblies (2)
mounting hooks (2)