Chamberlain Whisper Drive WD822C Manuel Du Propriétaire page 8

ASSEMBLY STEP 1
Assemble the T-Rail and
Attach the Belt 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. 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. Make sure bolt necks are
seated in the square holes and rails
are aligned before you 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 T-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 belt pulley bracket on the front end of
the T-rail as shown. Fasten securely 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.
Belt pulley bracket
attaches to FRONT
END of T-rail
T-rail
(Center Section)
T-rail
(End Section)
T-RAIL FRONT
(TO DOOR)
8
HARDWARE
SHOWN ACTUAL SIZE
Lock Nut
1/4"-20
Hex Bolt
5/16"-18x7/8"
T-RAIL BACK
(TO MOTOR UNIT)
Square Carriage
Bolt Hole
1/4" Lock Nut
Carriage Bolt
1/4"-20x1/2"
Belt Pulley
Bracket
Lock Washer
5/16"
Carriage Bolts
1/4"-20x1/2"
Nut Lock Washer
5/16"
5/16"-18
T-rail
(End Section)
Hex Bolts
5/16"-18x7/8"
Nut
5/16"-18