Dell Precision 7920 Rack Owner's Manual page 92

Figure 27. Pull out inner rail
2. Locate the rear rail standoff on each side of the system and lower them into the rear J-slots on the slide assemblies.
3. Rotate the system downward until all the rail standoffs are seated in the J-slots.
Figure 28. Rail standoffs seated in J-slots
4. Push the system inward until the lock levers click into place
5. Pull the blue slide release lock tabs forward on both rails and slide the system into the rack until the system is in the rack.
92 Disassembly and reassembly