Chamberlain 985 - Manual (Page 8)

• Open your door to the highest
point of travel as shown. Draw
an intersecting horizontal line
on the header wall 2" above
the high point. This height will
provide travel clearance for the
top edge of the door.
Header
Wall
Ceiling
Track
Highest Point
of Travel
Door
2"
8
Proceed to Step 2, page 10.
Door
Track
Header
Wall
Highest Point
of Travel
2"
Vertical
Guideline
Finished
Ceiling
Vertical
Guideline Header
Wall
2x4
Structural
Supports
SECTIONAL Doors and
ONE-PIECE Door With Track
• Close the door and mark the inside
vertical centerline of the garage door.
• Extend the line onto the header wall
above the door.
Remember, you can fasten the header
bracket within 4 feet to the left or right
of the door center
only if a torsion
spring or center bearing plate is in the
way; or you can attach it to the ceiling
(refer to page 10) when clearance is
minimal. (It may be mounted on the
wall upside down if necessary, to gain
approximately 1/2".)
If you need to install the header bracket
on a 2x4 (on wall or ceiling), use lag
screws (not supplied) to securely fasten
the 2x4 to structural supports as shown
here and on page 9.
Installation Section: Pages 8 – 23
Sectional door with
curved track
One-piece door with
horizontal track
Installation Step 1
Determine Header Bracket Location
Installation procedures vary according to garage
door types. Follow the instructions which apply to
your door. If the header bracket is not rigidly fastened to
a structural support on the header wall or
ceiling, the safety reverse system may not
work properly (see page 26).
The door might
not reverse when required, and could cause
serious injury or death.
The garage door springs, cables, pulleys,
brackets and their hardware are under extreme
tension.
Do not attempt to loosen, move or
adjust them yourself. Serious personal injury
or death could result. Call for professional
garage door service.
WARNING