Craftsman 139.18451DM Manuel D'instructions page 23

INSTALLATION STEP 11
Fasten the Door Bracket
Follow instructions which apply to your door type as illustrated
below or on the following page.
A horizontal reinforcement brace should be long enough to be
secured to two vertical supports. A vertical reinforcement brace
should cover the height of the top panel.
Figure 1 shows one piece of angle iron as the horizontal brace.
For the vertical brace, 2 pieces of angle iron are used to create a
U-shaped support. The best solution is to check with your garage
door manufacturer for an opener installation door reinforcement
kit.
NOTE: Many door reinforcement kits provide for direct attachment
of the clevis pin and door arm. In this case you will not need the
door bracket; proceed to Step 12.
SECTIONAL DOORS
1. Center the door bracket on the previously marked vertical
centerline used for the header bracket installation. Note correct
UP placement, as stamped inside the bracket.
2. Position the top edge of the bracket 2"-4" (5-10 cm) below the
top edge of the door, OR directly below any structural support
across the top of the door.
3. Mark, drill holes and install as follows, depending on your
door's construction:
Metal or light weight doors using a vertical angle iron brace
between the door panel support and the door bracket:
• Drill 3/16" fastening holes. Secure the door bracket using the
two 1/4"-14x5/8" self-threading screws. (Figure 2A)
• Alternately, use two 5/16" bolts, lock washers and nuts (not
provided). (Figure 2B)
Metal, insulated or light weight factory reinforced doors:
• Drill 3/16" fastening holes. Secure the door bracket using the
self-threading screws. (Figure 3)
Wood Doors:
• Use top and bottom or side to side door bracket holes. Drill
5/16" holes through the door and secure bracket with 5/16"x2"
carriage bolts, lock washers and nuts (not provided). (Figure 4)
NOTE: The 1/4"-14x5/8" self-threading screws are not intended for
use on wood doors.
HARDWARE SHOWN
ACTUAL SIZE
Self-Threading
Screw
1/4"-14x5/8"
23
Fiberglass, aluminum or lightweight steel garage doors WILL
REQUIRE reinforcement BEFORE installation of door bracket.
Contact your door manufacturer for reinforcement kit.
Header
Bracket
Door
Bracket
Location
Vertical
Centerline
of Garage
Door
Figure 1
Vertical
Reinforcement
Vertical
Centerline
of Garage Door
UP
Door
Bracket
Self-Threading
Screw 1/4"-14x5/8"
Figure 2A
(Not Provided)
Vertical
Centerline
of Garage Door
UP
Self-Threading
Screw
1/4"-14x5/8"
Figure 3
HORIZONTAL AND VERTICAL
REINFORCEMENT IS NEEDED FOR
LIGHTWEIGHT GARAGE DOORS
(FIBERGLASS, ALUMINUM, STEEL,
DOORS WITH GLASS PANEL, ETC.).
(NOT PROVIDED)
Vertical
Reinforcement
Vertical
Centerline
of Garage Door
Bolt
5/16"-18x2"
(Not Provided)
Door
Bracket
Lock Washer
5/16"
Nut
5/16"-18
Figure 2B
Inside Edge
of Door or
Reinforcement Board
Bolt
5/16"x2"
Vertical
Centerline
of Garage
Door
UP
UP
Figure 4