Chamberlain 1200 Owner's Manual page 9

Assembly Step 1
Attach the T-rail to the Opener
For Models 1256 and 1246 only
• Place the opener on packing material to protect
the cover.
• Remove the (2) 5/16"-18x1/2" washered screws
mounted in the top of the opener.
• Align T-rail and styrofoam over opener sprocket.
• Cut tape from T-rail, chain and styrofoam.
Remove styrofoam and pull the chain back
(away from mounting plate)
• Fasten the rail with the (2) washered screws
previously removed. Tighten securely.
Remember to use only these screws! Any other
screws will cause serious damage to the opener.
To fasten rail, use only those screws mounted
in the top of the opener. Any other screws will
cause serious damage to the opener.
Styrofoam
Packaging
Chain
T-rail
5/16"-18x1/2"
USE ONLY THIS
TYPE AND SIZE
SCREW
Chain
T-rail
Styrofoam
Packaging
9
CAUTION
USE ONLY THIS
TYPE AND SIZE
SCREW
Washered
Screws
Opener
Sprocket
Washered Screws
5/16"-18x1/2"
Mounting
Plate
Opener
Chassis