Craftsman 139.53975SRT - Manual (Page 12)

Installation Section: Pages 12-27
instaliation 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
Door With Track
Vertical
Guideline
Finished
Ceiling
If the header bracket is not rigidly fastened to
a structural support on the header wait or
ceiling, the safety reverse system may not
work properly (see page 30).
The door m ight
not reverse w hen required, and couid cause
serious injury or death.
The garage door springs, cables, pulleys,
brackets and their hardware are under extreme
tension. Do not attem pt to ioosen, m ove or
adjust them yourself. Serious personal injury
or death could result.
Caii for professionai
garage door service. * •
• 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 of 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 cetiing
(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 provided) to secureiy fasten
the 2x4 to structural supports as shown
here and on page 13.
• 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.
Door clearance brackets are
available for sectional doors
when headroom clearance is
less than 2“. See accessory
page 38.
Ceiling
Door
Header
-Wall
— 2‘ Track
Highest Point
of Travel
Proceed to Step 2, page 14.
Sectional door
with curved track
One-piece door
with horizontal track
12