Assembly - Craftsman 139.536481DM Owner's Manual

ASSEMBLY STEP 1
Assemble the Rail and
Attach the Cable Pulley Bracket
To avoid installation difficulties,do not run the garage door
opener until instructedto do so.
1. Align the three rail sections on a flat surface exactly as shown.
Front and back sections are interchangeablefor easeof
assembly.
2. Insert the carriage bolts so the square bolt
necks seat in the square holes in the rail
U
sections and pass through the round holes in
the center section rail. Make sure holt necks
are seated in the squareholes and rails are
aligned beforeyou tighten lock nuts.
Improper assembly can cause jerky trolley
operation, noise and/or nuisance door
reversals.
3. Assemble lock nuts, ensure alignment and
tighten.
NOTE:If rail is not assembled exactly as shown, trolley will not
travel smoothly along length of rail or it will hit against nuts.
4. Position the cable pulley bracket on the front end of the rail as
shown. Fastensecurely with the hardware shown.
NOTE:When tightening the bolts, be sure to keep bracket
parallel to the rail. Otherwise, the rail may bow when the opener
is operated.
HARDWARESHOWN ACTUALSIZE
Q
Lock Nut
1/4"- 20 x 7/16"
,1111111111 D
Hex Screw
5/16" - 18 x 7/8"
Carriage Bolts
1/4"- 20 x 1/2"
Nut
5/16"- 18
RAIL BACK
(TO OPENER)
Rail
(Center Section)
1/4" Lock Nut
\
\
Brace
Rail
(End Section)
Rail
(End Section)
Cable pulley bracket
attaches to FRONT
ENDof Rail
RAIL FRONT
(TO DOOR)
Brace
Square Carriage
Bolt Holes
Lock Washer
5/16"