IBM IntelliStation 6866 Hardware Maintenance Manual page 49

To install the computer into the rack enclosure:
1. Install a cage nut in each front mounting rail in the marked positions, as shown.
2. Position the computer horizontally, with the 3.5-inch drive bays on the top.
3. Align the inner slides of the computer with the slide rails; then, slide the
computer onto the outer slide, until the slide rails click into place.
Note: When the computer is fully extended, safety latches on the slide rails lock
into place. This prevents the computer from being accidentally pulled out
too far and dropped. To release the safety latch, press in.
4. Press the safety latches and slide the computer about halfway into the rack
enclosure.
5. Attach the cable-management arm to the cable-arm bracket, using two long
screws.
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FRU replacements