Assembly Section: Pages; Assemble T-Rail; Attach Belt Pulley Bracket - Craftsman 139.53800SRT Owner's Manual

To avoid installation difficulties, do not run the garage door opener until instructed to do so.
Assembly Step 1
Assemble the T-rail &
Attach the Belt Pulley Bracket
• Place the 3 T-rail sections on a flat surface for
assembly. 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.
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.
T-rail
(End Section)
Belt pulley bracket
attaches to FRONT
END of T-rail
T-RAIL FRONT
(TO DOOR)
Hardware Shown Actual Size
Lock Nut
1/4"-20x7/16"
Hex Screw
5/16"-18x7/8"
Assembly Section: Pages 8 – 11
(Center Section)
Brace
Square Carriage
Bolt Holes
Carriage Bolts
1/4"-20x1/2"
Nut Lock Washer
5/16"
5/16"-18
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.
1/4'' Lock Nut
Brace
T-rail
Belt Pulley
Bracket
Lock Washer
5/16"
• Position the belt pulley bracket on the front end of the
T-rail as shown. Fasten securely with the hardware
shown.
Right
8
Right Wrong
T-RAIL BACK
(TO OPENER)
T-rail
(End Section)
Carriage Bolt
1/4"-20x1/2"
Hex Screws
5/16"-18x7/8"
Nut
5/16"-18
When
tightening the
screws, be
sure to keep
bracket parallel
to the rail.
Otherwise, the
rail may bow
when opener is
Wrong
operated.