Craftsman 139.53335SRT3 Garage Door Opener User 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 Cable Pulley Bracket
Alignthe 3 T-rail sections on a flat 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
seatedIn thesquare ,_
holesandrailsare
U
alignedbeforeyou
tightenlocknuts.(See
rightandwrongviews).
Improperassemblycan
cause jerky trolley
operation,noiseand/or Right
nuisance door reversals.
Wrong
T-RAiL BACK
(TO OPENER)
T-rail
(End Section)
1/4" Lock Nut
Q
Brace
IfT-reil Isnot assembled I
EXACTLYas shown,trolley ]
willnot travel smoothly I
alonglengl_'tof railor it will
hit againstthe nuts.
T-rail
(Center Seclion)
f Carnage Bolt
T-rail
(End Section)
\
Cable pulley bracket
attaches to FRONT
END of T-fair
Square Carnage
Bolt Holes
T-RAIL FRONT
(TO DOOR)
Positionthecable pulleybracket on thefrontendof the
T-railas shown.Fasten securelywiththe hardware.
Hardware Shown Actual Size
©
Lock Nut Carnage Bolts
1/4" - 20 x 7116" 1/4"- 20 x 1/2"
Hex Screw Nut LockWasher
5/16" - 18 x 7/8" 5/16" - 18 5/16"
Hex Screws
5/16'- 18x7/8"
5/16'
O
Right
Wrong
When tightening
the screws, be
sure to keep
bracket parallel
to the rail.
Otherwise, the
rail may bow
when opener is
operated.
8