Dell Precision R5500 (Early 2011) - Manual (Page 30)

Installing the System Fans
1. Insert the fan in the cooling fan assembly until it clicks into place.
2. Repeat step 1 for the remaining cooling fans.
3. Install the control panel .
4. Install the power supply .
5. Install the SAS backplane .
6. Install the hard drive assembly .
7. Install the hard-drive carrier .
8. Install the optical drive .
9. Install the cooling shroud .
10. Install the cover .
11. Install the front bezel .
12. Follow the procedures in After Working Inside Your Computer .
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Removing the System Fans
30