Sears 39.18205SR - 1/2 HP Owner's Manual page 12

INSTALLATION STEP 3
Position the Opener
Follow instructions which apply to your door
type as illustrated.
INSTALLATION — SECTION DOOR & 1-PIECE DOOR WITH TRACK
NOTE: A 2x4 is convenient for setting an idea
door-to Tee rail distance. It is not necessary when
headroom is insufficient.
PROCEDURE: Measure the distance from floor to
top of door (in fully open position and parallel to the
floor). Using a stepladder as a support, raise opener
to the same distance from the floor (it will have a
slight angle as shown).
Tee Rail
Door
INSTALLATION – 1-PIECE DOOR WITHOUT TRACK
PROCEDURE: Raise the opener onto a stepladder.
Open garage door. Place a 2x4 on the top section of
door near centerline as shown. Rest Tee rail on 2x4 as
shown.
2x4
Stepladder
The top of the door should be level with the top of
opener. For maximum efficiency, do not position
opener more than 2 inches above this point.
Header
Bracket
Equal
Distance
from
Floor
12
TO PREVENT DAMAGE TO ALL
LIGHT-WEIGHT DOORS AND DOORS
WITH WINDOWS, DO NOT REST THE
OPENER ON THE DOOR.
Top of Opener