Lenovo ThinkCentre M81 User Manual page 74

4. Disconnect the rear fan assembly cable from the system fan connector on the system board. See
"Locating parts on the system board" on page 13.
5. The rear fan assembly is attached to the chassis by four rubber mounts. Remove the rear fan assembly
by breaking or cutting the rubber mounts and gently pulling the rear fan assembly out of the chassis.
Note: The new rear fan assembly will have four new rubber mounts attached.
Figure 45. Removing the rear fan assembly
6. Install the new rear fan assembly by aligning the new rubber mounts with the corresponding holes in the
chassis and push the rubber mounts through the holes.
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ThinkCentre User Guide