Craftsman 139.53403 - Manual (Page 11)

Installation
STEP 2
Attach Tee Rail to Header Bracket
PROCEDURE: Position opener chassis on garage
floor below header bracket. Use packing material
base to protect cover NOTE: To enable Tee rail to
clear sectional door springs, it may be necessary
to lift the chassis onto a temporary support
CAUTION: Chassis must either be secured to the
support or held firmly in place by another person.
Raise Tee rail until cable pulley and header brackets
come together. Align bracket holes and join with
clevis pin as shown. Secure with a ring or colter pin
fastener (if cotter pin is used, spread to secure)
STEPS
Position Opener Chassis
Follow instructions which apply to your door type as illustrated below
TO PREVENT DAMAGE TO ALL LIGHTWEIGHT DOORS AND DOORS WITH WINDOWS, DO
NOT REST THE OPENER ON THE DOOR.
SECTIONAL and ONE-PIECE
DOOR WITH TRACK
INSTALLATION
NOTE: A 2x4 is convenient for setting an ideal
door-to-Tee rail distance. It is not necessary where
headroom is insufficient.
PROCEDURE: Raise the opener chassis onto a step-
ladder Open garage door Place a 2x4 on edge on
top section of door near centerline. Rest Tee rail
on 2x4
ONE-PIECE DOOR
WITH NO - TRACK
INSTALLATION
PROCEDURE: Measure the distance from floor to
top of door (in fully open position and parallel to the
floor)
Using a slepladder as a support, raise the opener
chassis to the same distance from the floor (chassis
will have a slight angle as shown)
The top of the door should be level with the top of the
opener For maximum efficiency, do not position the
opener chassis more than 2 inches above this point.
Top o( Opener
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