Illustration Of Sectional Door Installation - Craftsman 139.18076 Owner's Manual

SECTIONAL Door Installation
Before you begin, survey your garage area to
see whether any of the conditions below apply
to your installation.
Horizontal and vertical reinforcement
is needed for lightweight garage doors
(fiberglass, steel, aluminum, door
with glass panels, etc.).
See page 24 for details.
Header Wall
Safety Reversing Sensor
Based on your particular requirements, there are
several installation steps which might call for
materials and/or hardware not included in the carton.
• Step 1, page 12 - Look at the wall or ceiling above
the garage door. The header bracket must be
securely fastened to structural supports.
• Step 5, page 17 - Do you have a finished ceiling in
your garage? If so, a support bracket and
additional fastening hardware may be required.
• Safety reversing sensor, page 21 - Depending
upon garage construction, wood blocks or
extension brackets (see Accessories page 38)
may be needed to fasten sensors to mounting
locations.
• Step 10, page 22 - Floor mounting of the safety
reversing sensor will require hardware not
provided.
• Step 11, page 24 - Do you have a steel, aluminum,
fiberglass or glass panel door? If so, horizontal
and vertical reinforcement is required.
• Look at the garage door where it meets the floor.
It must close on the floor all the way across.
Otherwise, the safety reverse system may not
work properly. See page 30. Floor or door should
be repaired.
You may find it helpful to refer back to this page as you proceed with the installation of your opener.
Extension
Spring
OR
Torsion
Door
Spring
Center
Safety
Reversing
Sensor
Floor must be level
across width of door.
4
FINISHED CEILING
Support bracket &
fastening hardware
is required.
See page 17.
Access Door
Header
Bracket
Trolley
Stop Bolt
Garage
Door
Spring
Straight
Door
Arm
Curved
Door
Header
Arm
Wall
Door
Garage
Bracket
Door
• An 8 foot high door will require Item No. 18728 Rail
Extension Kit. A 10 foot high door will require Item
No. 18740 Rail Extension Kit.
• The opener can be installed within 4 feet to the left
or right of the door center if there is a torsion spring
or center bearing plate in the way of the header
bracket or door bracket area. If your door has
extension springs, the opener must be installed in
the center of the door. See pages 12 and 24.
• Do you have an access door in addition to the
garage door? If not, Model 18752 Emergency Key
Release is required. See page 38.
Closed Position
Trolley
Chain
Emergency Release
Rope & Handle