Assembly Section: Pages; Assemble T-Rail; Attach Belt Pulley Bracket - Craftsman 139.53664SRT2 Owner's Manual

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-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.
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-RAtL BACK
(TO OPENER)
T-rail
(End Section)
1/4" Lock Nut
Brace
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-raU
Brace
Square Carriage
Bolt Holes
T-RAIL FRONT
(TO DOOR)
• Position the belt pulley bracket on the front end of the
T-rail as shown. Fasten securely with the hardware
shown.
Hex Screws
5/16'-18x7/8"
,,r.o.O-
T-rail
\ Carriage Bolt
, _ 1/4"-20X1/2"
Hardware Shown Actual Size
©
Lock Nut Carriage Bolts
1/4"-20x7/16" 1/4"-20xl/2"
Hex Screw Nut Lock Washer
5/16"-18x7/8" 5/16"-18 5/16"
Q
Right Wrong
When
tightening the
screws, be
sure to keep
bracket parallel
to the rail.
Otherwise, the
rail may bow
when opener is
operated.