Install Backhang - Overhead door 321 Series Installation Instructions Manual

9. INSTALLING THE BACKHANG
WARNING
If horizontal tracks are set too far apart at rear,
door may fall from tracks resulting in serious
personal injury. Raise door slowly so that
distance between tracks can be checked.
1. Raise the Door slowly until it is halfway into the
opening. Watch the top track rollers and horizontal
tracks.
2. Clamp the door in place using vise grips.
3. Check the spacing between ends of door and
tracks. Maintain a 1" clearance when setting the
backhang.
INSTALLING CEILING ANGLE
4. Using a stud finder, locate ceiling joists nearest rear
end of horizontal tracks. NOTE: Figure 9-1 should
help to locate ceiling joists.
5. Cut two lengths as appropriate of perforated angle
for ceiling angles (not supplied).
6. Secure ceiling angles to ceiling joists using lag
screws (not supplied).
INSTALLING VERTICAL ANGLE
7. Measure distance from ceiling to horizontal tracks at
front and rear.
NOTE: Rear of tracks should be elevated 1" higher
than front. (See Figure 9-2)
8. Cut vertical hanging angles to length required from
perforated angle (not supplied).
9. Secure hanging angles to ceiling angles and track
using hex head bolts (not supplied). (See Figure 9-3)
DO NOT install sway braces at this time. Go to the
next step first.
INSTALLING SWAY BRACES
10. Check spacing between ends of door and tracks.
Maintain 1" clearance.
11. If tracks are set too far apart, lower door and make
necessary adjustments.
12. Cut sway braces from perforated angle (not
supplied) and install using hex head bolts (not
supplied). (See Figure 9-4)
CEILING JOIST
Parallel to door.
DOOR
FIGURE 9-1
A
FRONT
HEADER
Dimension "B" should be 1" less
than dimension "A".
HORIZONTAL
TRACK
HANGING
NUT
LW
HORIZONTAL
TRACK
NUT
20
CEILING CEILING JOIST
JOISTS
Perpendicular to door.
SHEET ROCK
CEILING
ANGLE
CEILING
TRACK SLOPES UP
HORIZONTAL TRACK
FIGURE 9-2
NUT
LW
CEILING
ANGLE
HANGING
ANGLE
1/4-20 X 5/8
LW
BOLT
NUT
FIGURE 9-3
CEILING
ANGLE
ANGLE
1/4 - 20 X 5/8
BOLT
SWAY
BRACE
1/4-20 X 5/8
BOLT
LW
FIGURE 9-4
DOOR
B
BACK
1/4 - 20 X 5/8
BOLT