Assembly Section: Pages; Assemble T-Rail; Attach Cable Pulley Bracket - Chamberlain Series 651-2MM-1/2HP Owner's Manual

To avoid installation difficulties, do not run the garage door opener until instructed to do so.
Assembly Step 1
Cable Pulley
Bracket
Assemble the T-rail &
Attach the Cable Pulley Bracket
• Align the 4 T-rail sections on a flat surface
exactly as shown. Center sections are
Lock Washer
interchangeable. Front and back sections are
5/16"
also interchangeable for ease of assembly.
• Insert the carriage bolts so the square bolt
necks seat in the square holes in the T-rail
sections and pass through the round holes in
the rail braces. Assemble lock nuts, ensure
alignment and tighten.
If T-rail is not assembled
exactly as shown, trolley
will not travel smoothly
along length of rail or it
will hit against nuts.
Cable pulley bracket
attaches to FRONT
END of T-rail
• Position the cable pulley bracket on the front end
of the T-rail as shown. Fasten securely with the
hardware shown.
Cable Pulley
Bracket
Lock Washer
5/16"
Hex Screws
Assembly Section: Pages 8 – 11
5/16"-18x7/8"
Nut
5/16"-18
T-rail
(End Section)
T-RAIL FRONT
(TO DOOR)
Assemble Tee
Hex Screws
5/16"-18x7/8"
Nut
5/16"-18
1/4" Lock Nut
4/1
1/4"-20x7/16"
Hex Screw
5/16"-18x7/8"
Right
8
T-RAIL BACK
(TO OPENER)
Square Carriage
Bolt Hole
T-rail
(Center Section)
Right
Wrong
Hardware Shown Actual Size
Carriage Bolt
Lock Nut
1/4"-20x1/2"
Nut
5/16"-18
Wrong
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
and wrong
views).
Improper
assembly can
cause jerky
trolley
operation, noise
and/or nuisance
door reversals.
Lock Washer
5/16"
When tightening
the screws, be
sure to keep
bracket parallel
to the rail.
Otherwise, the
rail may bow
when the opener
is operated.