Planning; Sectional Door Installation - Craftsman 139.18458DM 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
garage door. The header bracket must be securely fastened to
structural supports.
• Installation Step 5 – Do you have a finished ceiling in your
garage? If so, a support bracket and additional fastening
hardware may be required.
• Installation Step 10 – Depending upon garage construction,
extension brackets or wood blocks may be needed to install
sensors.
• Installation Step 10 – Alternate floor mounting of the safety
reversing sensor will require hardware not provided.
• Do you have an access door in addition to the garage door? If
not, Model 18752 Emergency Key Release is required. See
Accessories page.

SECTIONAL DOOR INSTALLATION

Horizontal and vertical reinforcement
is needed for lightweight garage doors
(fiberglass, steel, aluminum, door with
glass panels, etc.). See page 23 for details.
Vertical
Centerline
of Garage
Door
Safety Reversing Sensor
Header Wall
Safety Reversing Sensor
Gap between floor
and bottom of door
must not exceed 1/4" (6 mm).
• Look at the garage door where it meets the floor. Any gap
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 3. Floor or door should be
repaired.
SECTIONAL DOOR INSTALLATIONS
• Do you have a steel, aluminum, fiberglass or glass panel door?
If so, horizontal and vertical reinforce ment is required
(Installation Step 11).
• The opener should be installed above the center of the door.
If 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 11.
• If your door is more than 7 feet (2.13 m) high, see rail
extension kits listed on Accessories page.
FINISHED CEILING
Slack in chain tension
is normal when
garage door is closed.
Extension Spring
OR
Torsion Spring
Wall-mounted
Access Door
Door Control
4
Support bracket &
fastening hardware
is required.
See page 16.
Header
Bracket
Trolley
Stop Bolt
Garage
Door
Spring
Straight
Door
Arm
Curved
Door
Header
Arm
Wall
Door
Garage
Bracket
Door
Motor unit
CLOSED POSITION
Trolley
Chain
Emergency
Release
Rope & Handle