3Com Router 6000 FamilyInstallation ManualChapter 8Installing B68 Cabinets3Com Corporation8-228.3.5 Installing RacksI. Installing expansion tubes and nutsPrior to installation, clean dust inside and outside the holes with a dust collector and thenmeasure the spacing of holes. If errors are not acceptable, you must measure and drill again.Follow these steps to install an expansion bolt:1) Take down the expansion tube and expansion nut, and insert the alignment ribon the expansion nut into the alignment groove of expansion tube.2) Put them into a hole vertically.3) Punch the expansion tube with rubber hammer until the expansion tube iscompletely buried into the floor.Figure 8-25 illustrates how to install an expansion nut to an expansion tube.1) Expansion tube 2) Alignment groove3) Expansion nut 4) Alignment ribFigure 8-25 Install an expansion nut onto an expansion tubeCaution:You must insert the alignment rib of expansion nuts into the alignment grooves ofexpansion tubes, or you will be unable to install or fasten the expansion bolts.II. Adjusting rack heightAccording to the floor height and the height silkscreen of the antistatic floor on the rack, adjustall racks to the estimated height and torque the retaining bolts to 45 Nm with a torque spanner,from middle to the two sides, as shown in Figure 8-26.
