Installation Section: Pages; Determine Header Bracket Location; Sectional Door - Chamberlain Series 651-2MM-1/2HP Owner's Manual

Installation Step 1

Determine Header Bracket Location

Installation procedures vary according to garage
door types. Follow the instructions which apply to
your door.
SECTIONAL Door and
ONE-PIECE Door With Track
Header
Wall
• 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.
Proceed to Step 2, page 14.
Installation Section: Pages 12 – 27
Vertical
Guideline
2x4
Vertical
Guideline
Door

Sectional door

with curved track
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 30). 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.
Finished
Ceiling
Structural
Supports
Ceiling
Header
Wall
Track
2"
Highest Point
of Travel
12
WARNING
• 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 2 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 14)
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 13.
Door
One-piece door
with horizontal track
Header
Wall
Track
2"
Highest Point
of Travel