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

Assembly Section: Pages 8 - 11
To avoid installation difficulties, do not run the garage door opener until instructed to do so.
.................. i
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
1/4 _'Lock Nut
\
Q
T-rait
(End Sec_on)
T-RAIL BACK
(TO OPENER)
' tf T-ratl is not assembled
EXACTLY as shown,
trolley will not travel
Jsmoothly along length of
Jrail or it wilt hit against
t the nuts.
T-raB
(Center Section)
• Caniage Bott
, _,_ t/4"-20x!12'
T-tall
(End Section)
Belt pulley bracke!
attaches to FRONT
END of T-rail
T-RAIL FRONT
(TODOOR)
Square Carriage
Bolt Holes
Hardware Shown Actual Size
©
Lock Nut
1t4"-20x71!6 =
Hex Screw
5/16"-18x7/8'
Carriage Bolls
1/4"-20xlt2"
Nut Lock Washer
5/16"-18 5/16"
• Pos_ion the belt pulley bracket on the front end of the
T-rail as shown. Fasten securely with the hardware
shown.
When
O _ tighteningthe
screws, be
sure to keep
bracket parallel
to the rail.
Otherwise, the
rail may bow
Right Wrong when opener ts
operated.