Assembly Pages; Attach The T-Rail To The Motor Unit; Attach The Chain To The Sprocket - Chamberlain LiftMASTER SECURITY 1265-267 Owner's Manual

ASSEMBLY STEP 1

Attach the T-Rail to the Motor Unit

To avoid installation difficulties, do not run the
garage door opener until instructed to do so.
• Remove the two washered screws mounted in top
of motor unit.
• Position T-rail at a 45˚ angle to opener so one hole
in T-rail and motor unit 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 sprocket. Cut tape
from T-rail, chain and styrofoam.
• REMOVE STYROFOAM.
ASSEMBLY STEP 2

Attach the Chain to the Sprocket

and Install the Sprocket Cover
• Position chain over the 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 motor
unit!
• Tighten both screws securely through the T-rail into
the motor unit as shown.
• Install the sprocket cover: Insert the back tab in the
slot. Squeeze the cover slightly and insert the front
tab in the slot on the mounting plate.
Proceed to Assembly Step 3.
CAUTION
To avoid serious damage to opener, ONLY use screws
mounted in top of motor unit.
USE ONLY THIS
TYPE AND SIZE
SCREW
WARNING
To avoid possible SERIOUS INJURY to fingers from
moving garage door opener:
• ALWAYS keep hand clear of sprocket while operating
opener.
• Securely attach sprocket cover before operating.
USE ONLY THIS
TYPE AND SIZE
SCREW
Front Tab Slot
6
Washered Screw
5/16"-18x1/2"
Styrofoam
T-rail
Hole
Washered Screw
Sprocket
5/16"-18x1/2"
Sprocket Cover
Back Tab Slot
Mounting
Plate