Craftsman 1/2HP Garage Door Opener 139.53515SR - Manual (Page 6)

Assembly
TO AVOID INSTALLATION DIFFICULTIES, DO NOT RUN THE GARAGE DOOR OPENER UNTIL INSTRUCTED TO DO SO.
STEP 1
Assemble Tee Rail & Attach Cable Pulley Bracket
TEE RAIL BACK
(TO CHASSIS)
CAUTION: Do not tighten the lock nuts until bolt necks
sre seated in square holes.
1/4“ Lock Nut
Tee Rail
(End Section)
Tee Rail
(Center Section)
The end sections of the rsil MUST be
connected to the center section from
the direction shown in the illustration.
Otherwise, the trolley will hit against
the nut when installed (Pg. 7).
Tee Ral
(End Section)
Cable pulley bracket
attaches to FRONT
END of tee rail
TEE RAIL FRONT
(TOEXXJR)
Carriage Bolt
1/4--20X1/2*
PROCEDURE: Place the 3 Tee rail sections on a flat
surface for assembly. THIS IS IMPORTANT. The end
sections are identical. THE CENTER SECTION BRACES
MUST BE POSITIONED AGAINST THE END SECTIONS
AS SHOWN. Make sure that the “directional arrow’’is
pointing toward the front (to door). Study the illustration
CAREFULLY.
(When assembled. Tee rail has a front-to-back position as
shown.)
Bolt rail sections together with the hardware illustrated arxl
from the direction indicated.
SQUARE NECKS ON THE CARRIAGE BOLTS MUST BE
SEATED IN THE SQUARE HOLES IN RAIL SECTIONS.
Screws
8x7/8"
Cable Pulley
Bracket
Lock Washer
5/16"
Nut
-5/16"
Position the cable pulley bracket on front end of tee rail
as shown. Fasten securely with the hardware provided.
IMPORTANT: When tightening screws, be sure to keep
bracket parallel to rail. Otherwise, rail may bow when
opener is operated.