Craftsman 139.18865 Owner's Manual page 4

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.
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.
FINISHED CEILING
• Step 5, page 17 - Do you have a finished ceiling in
Support bracket &
fastening hardware
your garage? If so, a support bracket and
is required.
additional fastening hardware may be required.
See page 17.
Slack in Chain Tension
• Safety reversing sensor, page 21 - Depending
is Normal When
upon garage construction, wood blocks may need
Garage Door is Closed
to be fastened to mounting locations before
sensors are installed.
• Step 10, page 22 - Alternate 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.
Extension
Spring
• Look at the garage door where it meets the floor.
OR
It must close on the floor all the way across.
Access Door
Torsion
Otherwise, the safety reverse system may not
Spring
work properly. See page 30. Floor or door should
be repaired.
• If your door is more than 7 feet high, see the
longer rails available on page 38.
Safety
Reversing
Sensor
Header Wall
Door
Center
Floor must be level
across width of door.
FINISHED CEILING
Support bracket &
fastening hardware
is required.
See page 17.
Slack in Chain Tension
is Normal When
Garage Door is Closed
Extension
Spring
OR
Access Door
Torsion
Spring
Safety
Reversing
Sensor
Header Cable Pulley
Bracket
Garage
Door
Spring
Header
Wall
Door Bracket
Garage
Door
• The opener can be installed within 2 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 Outside
Trolley Release is required. See page 38.
You may find it helpful to refer back to this page as
you proceed with the installation of your opener.
4
Closed Position
Bracket
Rail Assembly
Trolley
Cable
Emergency Release
Rope & Handle
Straight
Door
Arm
Curved
Door
Arm