Chamberlain 3280-267C, 3280C Fasten the Door Bracket, NOTE:, NOTE:, Figure, Figure, Figure, Figure 2B, Figure 2A, Wood Doors:, WILL REQUIRE, SECTIONAL DOORS

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 or three 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.

CAUTION

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

	HORIZONTAL AND VERTICAL
	REINFORCEMENT IS NEEDED
Vertical	FOR LIGHTWEIGHT GARAGE
Centerline	DOORS (FIBERGLASS,
of Garage	ALUMINUM, STEEL, DOORS
Door	WITH GLASS PANEL, ETC.).
	(NOT PROVIDED)

Figure 1

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

Vertical

Reinforcement

Vertical

Centerline

of Garage Door

UP

Door

Bracket

Self-Threading Screw 1/4"-14x5/8"

Vertical

(Not Provided) Reinforcement

Vertical

Centerline

of Garage Door

Bolt 5/16"-18x2"

UP

Door

Bracket

Lock Washer

5/16" Nut

5/16"-18

Figure 2B

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"	HARDWARE
self-threading screws are
	SHOWN
not intended for use on	ACTUAL SIZE
wood doors.	Self-Threading
	Screw
	1/4"-14x5/8"

Figure 2A

(Not Provided)		Inside Edge
		of Door or
		Reinforcement Board
	Bolt
	5/16"x2"
		UP
Vertical
Centerline
of Garage Door	Vertical
UP	Centerline
	of Garage
	Door
Self-Threading		Figure 4
Screw
1/4"-14x5/8"

Figure 3

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