Craftsman 139.53664SRT2 - Manual (Page 8)

Assembly Section: Pages 8 - 1 1
To avoid installation difficulties, do not run the garage door opener until instructed to do so.
Assembly Step 1
Assemble the T-raU &
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-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.
Carriage Bolt
1/4"-20Xl/2"
Belt pulley bracket
attaches to FRONT
END o1 T-rall
Hardware Shown Actual Size
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".
Carriage Bolts
1/4"-20x1/2‘
H
1 1 1 1
1
— 1 1 1 1 1 1
Hex Screw
5/16'-18x7/8"
Lock Washer
5/16" '
Nut
5/16'-18
Right Wrong
When
tightening the
screws, be
sure to keep
bracket parallel
to the rail.
Otherwise, the
rail may bow
when opener is
operated.