Planning; Sectional Door Installation - Craftsman 139.55918 Owner's Manual

Planning

Identify the type and height of your garage door. Survey your
garage area to see if any of the conditions below apply to your
installation. Additional materials may be required. You may find it
helpful to refer back to this page and the accompanying
illustrations as you proceed with the installation of your opener.
Depending on your requirements, there are several installation
steps which may call for materials or hardware not included in the
carton.
Installation Step 1 – Look at the wall or ceiling above the
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garage door. The header bracket must be securely fastened to
structural supports.
Installation Step 5 – Do you have a finished ceiling in your
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garage? If so, a support bracket and additional fastening
hardware may be required.
Installation Step 12 – Depending upon garage construction,
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extension brackets or wood blocks may be needed to install
sensors.
Installation Step 12 – Alternate floor mounting of the safety
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reversing sensor will require hardware not provided.

SECTIONAL DOOR INSTALLATION

Horizontal and vertical reinforcement
is needed for lightweight garage doors
(fiberglass, steel, aluminum, door with
glass panels, etc.). See page 18 for details.
Header Wall
Vertical
Centerline
of Garage
Door
Safety Reversing Sensor
Torsion Spring
Gap between floor
and bottom of door
must not exceed 1/4" (6 mm).
Do you have an access door in addition to the garage door? If
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not, Model 139.53702 Emergency Key Release is required. See
Accessories page.
Look at the garage door where it meets the floor. Any gap
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between the floor and the bottom of the door must not exceed
1/4" (6 mm). Otherwise, the safety reversal system may not
work properly. See Adjustment Step 2. Floor or door should be
repaired.
SECTIONAL DOOR INSTALLATION
Do you have a steel, aluminum, fiberglass or glass panel door?
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If so, horizontal and vertical reinforcement is required
(Installation Step 8).
The opener should be installed above the center of the door. If
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there is a torsion spring or center bearing plate in the way of
the header bracket, it may be installed within 4 feet (1.22 m) to
the left or right of the door center. See Installation Steps 1
and 8.
If your door is more than 7 feet (2.13 m) high, see rail
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extension kits listed on Accessories page.
FINISHED CEILING
Rail
Extension Spring
OR
Access Door
Wall- mounted
Door Control
Safety
Reversing
Sensor
4
Support bracket &
fastening hardware
is required.
See page 16.
Motor unit
Header
Bracket
Trolley
Rail Tab
Garage
Door
Spring
Straight
Door
Arm
Header
Wall
Door Curved
Garage
Bracket Door Arm
Door
CLOSED POSITION
Belt
Emergency Release
Rope & Handle