User's Manual

RRU3278

Installation Guide

7 Installing RRU

Issue 05 (2017-03-10)

Huawei Proprietary and Confidential

Figure 7-26 Drilling holes and installing expansion bolts

1. Use a hammer drill with a Ф12 bit to drill holes vertically at the marked anchor points.

Ensure that the depth of each hole ranges from 55 mm (2.17 in.) to 60 mm (2.36 in.). Use

a vacuum cleaner to clear the dust out from inside and around the holes, and measure the

distances between holes. If any of the holes is beyond the acceptable range, mark a new

anchor point and drill a new hole.

Take proper safety measures to protect your eyes and respiratory tract against the dust before

drilling holes.

2. Tighten an expansion bolt slightly and place it vertically into each hole. Use a rubber

mallet to hammer the expansion bolt to ensure that all the expansion tube completely

enters the hole.

3. Slightly fasten the expansion bolt clockwise.

4. Rotate the bolts counterclockwise to loosen them, and remove each M8x85 bolt, spring

washer, plastic tube, and flat washer in sequence.

After completely removing an expansion bolt, store the plastic tube properly.

Step 4 Hammer the two M8×85 expansion bolts removed from the main mounting bracket into the

wall and use a combination wrench to tighten the nuts of the expansion bolts to 15 N·m, as

shown in Figure 7-27.