IBM System x3550 M4 Installation And User Manual page 14

Statement 4:
≥ 18 kg (39.7 lb.) ≥ 32 kg (70.5 lb.) ≥ 55 kg (121.2 lb.)
CAUTION:
Use safe practices when lifting.
Statement 5:
CAUTION:
The power control button on the device and the power switch on the power
supply do not turn off the electrical current supplied to the device. The device
also might have more than one power cord. To remove all electrical current
from the device, ensure that all power cords are disconnected from the power
source.
Statement 6:
CAUTION:
Do not place any objects on top of a rack-mounted device unless that
rack-mounted device is intended for use as a shelf.
Statement 8:
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IBM System x3550 M4 Type 7914: Installation and User's Guide