Lenovo ThinkSystem Heavy Duty Full Depth 48U User Manual page 40

Figure 40. Removing the outrigger stabilizing bars
Remove the eight screws that secure the two bars to the rack cabinet.
Place the two stabilizing bars on the ground, and remove the bars.
Step 3. Remove the four screws that secure each of the outriggers, and remove the outriggers.
Figure 41. Removing the outriggers
Step 4. Remove the front and rear doors of every rack cabinet that is to be part of the suite.
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ThinkSystem Heavy Duty Full Depth 48U Rack Cabinet User Guide