Chapter 3 Installing the Switch
Removing and Replacing the Fan Assembly
3-26
Cisco Catalyst 4900M Switch Installation Guide
78-18350-01
Caution Never operate the system for an extended period if the fan assembly is removed
or if it is not functioning properly. An over-temperature condition can cause
severe equipment damage.
Follow these steps to remove the existing fan assembly:
Step 1 Loosen the two captive installation screws on the fan assembly by turning them
counterclockwise.
Step 2 Grasp the fan assembly with both hands and pull it outward; gently move it side
to side if necessary to unseat it from the backplane. Slide it out of the chassis and
place it in a safe place.
Installing the Fan Assembly
Follow these steps to install the new fan assembly:
Step 1 Hold the fan assembly with the captive screws on the left.
Step 2 Place the fan assembly into the fan assembly bay so it rests on the chassis, and
then lift the fan assembly up slightly, aligning the top and bottom guides.
Step 3 Slide the fan assembly into the chassis until the two captive installation screws
make contact with the chassis.
Step 4 Using a screwdriver, tighten the two captive installation screws by turning them
clockwise.
