Assembly Section; Assembly Step - Chamberlain Group 1120E Serie Manual De Propietario

To avoid installation difficulties, do not run the garage door opener until instructed to do so.

ASSEMBLY STEP 1

Assemble the T-rail and
Attach Chain Pulley Bracket
• Place the 3 T-rail sections on a flat surface for
assembly. The end sections are identical. The
center section must be positioned with the
braces against the end sections as shown.
Make sure the "directional arrow" on the center
section is pointing toward the front (to door).
Study the illustration CAREFULLY.
• Bolt rail sections together with the hardware
illustrated and from the direction indicated. (When
assembled, T-rail has a front-to-back position as
shown.)
If T-rail is not assembled exactly as shown,
trolley will not travel smoothly along length
of rail or it will hit against nuts.
T-rail
(End Section)
Chain pulley bracket
attaches to FRONT
END of T-rail
T-RAIL FRONT
(TO DOOR)
• Position the chain pulley bracket on the front end
of the T-rail as shown. Fasten securely with the
hardware provided.
Chain Pulley
Bracket
Lock Washer
Nut
5/16"
5/16"
Assembly Section: Pages 8 – 12
Brace
(Center Section)
Square Carriage
Bolt Holes
Hex Screws
5/16"-18x7/8"
13mm Socket Wrench
1/4'' Lock Nut
Brace
T-rail
Hardware Shown Actual Size
Lock Nut
1/4" - 20 x 7/16"
Hex Screw
5/16" - 18 x 7/8"
Right Wrong
8
11mm Socket Wrench
T-RAIL BACK
(TO OPENER)
T-rail
(End Section)
Carriage Bolt
1/4"-20x1/2"
Make sure bolt
necks are seated
in the square
holes and rails are
aligned before
you tighten lock
nuts. (See right
Right
and wrong views).
Improper
assembly can
cause jerky trolley
operation, noise
and/or nuisance
door reversals.
Wrong
Carriage Bolts
1/4" - 20 x 1/2"
Lock washer
Nut
5/16"
5/16" - 18
When tightening the
screws, be sure to
keep bracket parallel
to the rail. Otherwise,
the rail may bow when
opener is operated.