User's Manual

Table Of Contents
We recommend that you loosen and tighten the door bolts in the order as shown in the following figure.
Figure 27: Recommended Order of Loosening and Tightening Bolts
The chassis door features an environmental seal that protects the chassis against environmental elements when
the door is closed. This seal creates pressure, which can cause the door to open suddenly when the last bolt
is loosened.
Before You Begin
You must provide a 1/2-inch (13 mm) socket wrench to open and close the router chassis door.
Cisco ASR 901S Series Aggregation Services Router Hardware Installation Guide
48 OL-29732-01
Installing the Router
Opening the Router Door
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