Chamberlain 3112EM FS2 Owner's Manual page 10

ASSEMBLY STEP 1
For Sliding and Swinging Gates ONLY
Assemble the T-Rail and
Attach the Cable Pulley Bracket
To avoid installation difficulties, do not
run the garage door opener until
instructed to do so.
1. Align the four T-rail sections on a flat
surface exactly as shown. Center
sections are interchangeable. Front and
back sections are also interchangeable
for ease of assembly.
2. Connect the center section and the 1/4"
lock nuts to the end sections from the
same side, as shown.
NOTE: If T-rail is not assembled exactly
as shown, trolley will not travel smoothly along length of
rail or it will hit against nuts.
3. Insert the carriage bolts from the opposite side of the
end sections. Tighten the nuts. When assembled, T-rail
has a front-to-back position as shown.
4. Position the cable pulley bracket on the front end of the
T-rail as shown. Fasten securely with the hardware
provided.
NOTE: When tightening the bolts be sure to keep
bracket parallel to the rail. Otherwise, the rail may bow
when the opener is operated.
Brace
T-rail
(End Section)
Rail connects to
opener at this end.
HARDWARE
SHOWN ACTUAL SIZE
Hex Bolt
5/16"-18x7/8"
Square Carriage
Bolt Hole
1/4" Lock Nut
Carriage Bolt
1/4"-20x1/2"
T-rail
(Center Section)
10
Carriage Bolts
Lock Nut
1/4"-20x1/2"
1/4"-20
Lock Washer
Nut
5/16"-18 5/16"
Cable pulley bracket
attaches to this
end of T-rail.
AWAY FROM
OPENER
T-rail
(End Section)
Hex Bolts
5/16"-18x7/8"
Lock Washer
5/16"
Nut
5/16"-18
Cable Pulley
Bracket