Assembly Section: Pages; Fasten T-Rail To Opener; Attach Chain To Sprocket And Install Sprocket Cover - Chamberlain 985 1/3HP Owner's Manual

Assembly Step 1
Attach the T-rail to the Opener
• Remove the two washered screws mounted in top
of opener.
• Position T-rail at a 45˚ angle to opener so one hole
in T-rail and opener line up.
• Thread one of the washered screws part way in.
Use only these screws! Use of any other screws
will cause serious damage to door opener.
• Align T-rail and styrofoam over opener sprocket.
Cut tape from T-rail, chain and styrofoam.
• REMOVE STYROFOAM.
Assembly Step 2
Attach Chain to Sprocket and
Install Sprocket Cover
• Position chain over the opener sprocket. If
necessary, loosen the outer nut on the trolley to
obtain more chain slack.
• Insert the second washered screw.
CAUTION: Use only the screw previously
removed from opener!
• Tighten both screws securely through the T-rail
into the opener as shown.
Install The Sprocket Cover:
• Insert the back tab in the opener slot. Squeeze the
cover slightly and insert the front tab in the slot on
the mounting plate.
Sprocket
Cover
Front Tab Slot
Mounting
Plate
Assembly Section: Pages 6 – 7
Back Tab Slot
Top of Opener
Proceed to Assembly Step 3, Page 7
To fasten rail, use only those screws mounted
in top of the opener. Failure to do so will cause
serious damage to the opener.
USE ONLY THIS
TYPE AND SIZE
SCREW
Chain
Serious injury can result if fingers become
entangled in moving opener sprocket. Attach
sprocket cover securely. Never operate opener
while your hand is near the opener sprocket.
USE ONLY THIS
TYPE AND SIZE
SCREW
6
CAUTION CAUTION
Washered Screw
5/16"-18x1/2"
Styrofoam
T-rail
Hole
WARNING
Washered Screw
5/16"-18x1/2"
Opener
Sprocket