Lenovo 7269D7U - Topseller M58e Sff E7500 2.93G 3Gb 320Gb Dvdrw W7p/Xpp Hardware Maintenance Manual page 98

5. Remove the rear fan assembly out of the chassis.
6. Install the new rear fan assembly by aligning the rubber mounts of the rear fan assembly with the holes
on the chassis and push the rubber mounts through the holes.
7. Pull on the tips of the rubber mounts until the rear fan assembly is in place.
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ThinkCentre Hardware Maintenance Manual