Cisco NCS 4000 Series Hardware Installation page 148

Replacing the Fan Tray
Step 2 Move the ejectors up or down into the stop or block position.
Step 3
Slide the fan tray into the chassis slot.Tilt the fan tray up when the fan tray is at an inch distance before it
slides completely.
Figure 66: Upper and Lower Fan Trays Inserted into Chassis
Step 4 Check the ejector engagement to be sure it is correct. Complete the ejectors rotation to fully insert the fan
trays.
Step 5 Tighten the two captive screws to lock the fan tray in place.
Hardware Installation Guide for Cisco NCS 4000 Series
128
Removing and Replacing Chassis Components