26
1/2 HP Chain Drive Garage Door Opener
For One-Piece Doors:
1. Mark a centerline on the top of the garage door as you marked for the header bracket (see Fig. B).
2. Position and center the door bracket onto the top of the garage door, mark and drill (2) 5/16” holes for the
left and right side of the door bracket (see below).
3. Place 2 Flat Washers (
∅
10 x 20-2) onto 2 Hex Bolts (5/16” x 18 x 2-1/2”), insert them through the bottom
of the garage, and through the top as shown. Next, place 2 Spring Washers (
∅
8), and 2 Nuts (5/16”) onto
the four mounting bolts and tighten.
Fig. B
One-Piece Door