Assembly step 1, M 1 * 1 – Sears CRAFTSMAN 139.53640SRT User Manual
Page 8
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Assembly Section: Pages 8 ™ 11
To avoid installation difficulties, do not run the garage door opener until instructed to do so.
Assembly Step 1
Assemble the T-raii & Attach
the Cable Pulley Bracket
• Align the 3 T-rail sections on a fiat surface exactly
as shown. The end sections are identical. Make
sure the "arrow label" on the center section is
pointing toward the door.
• Insert the carriage bolts so the square bolt necks
seat in the square holes in the T-rail end sections
and pass through the round holes in T-rail center
section. Assemble lock nuts, ensure alignment and
tighten.
Make sure bolt necks are
seated in the square
holes and rails are
aligned before you
tighten lock nuts. (See
right and wrong views).
Improper assembly can
cause jerky trolley
operation, noise and/or
nuisance door reversals
Right
Wrong
T-RAIL BACK
(TO OPENER)
1/4" Lock Nut
If T-rail is not assembled
EXACTLY as shown, trolley
will not travel smoothly
along length of rail or it will
hit against the nuts.
Cable pulley bracket
attaches to FRONT
END of T-rail
' Position the cable pulley bracket on the front end of the
T-raii as shown. Fasten securely with the hardware.
Carriage Bolts
1/4” - 20 X 1/2"
.
.
M 1
*
1
M [ ^
Hex Screw
5/16" -18 X 7/8”
Lock Washer
5/16"
Right
Wrong
When tightening
the screws, be
sure to keep
bracket parallel
to the rail.
Otherwise, the
rail may bow
when opener is
operated.