Lenovo M57e - ThinkCentre - 9481 Hardware Maintenance Manual page 121

4. Install the new rear fan assembly by aligning the rubber mounts of the system fan assembly with the
holes on the chassis and push the rubber mounts through the holes.
5. Pull on the tips of the rubber mounts until the fan assembly is in place.
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Chapter 9 Replacing FRUs (Types 7064, 7094, 9349, 9356, 9357, 9439, 9488, 9702, 9708, 9709, 9789, 9851, 9948)