Assembly; Fasten The Rail To The Motor Unit - Chamberlain 311 Owner's Manual

ASSEMBLY STEP 1

Fasten the Rail to the Motor Unit

• Remove the two washered bolts mounted in top of
motor unit.
• Position rail at an angle to opener so one hole in
rail and motor unit line up.
• Thread one of the washered bolts part way in.
Use only these bolts! Use of any other bolts will
cause serious damage to door opener.
• Align rail and styrofoam over sprocket. Cut tape
from 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 bolt. CAUTION: Use
only the bolt previously removed from motor
unit!
• Tighten both screws securely through the 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.
WARNING
CAUTION
To avoid SERIOUS damage to garage door opener,
use ONLY those bolts/fasteners mounted in the top of
the opener.
USE ONLY THIS
TYPE AND SIZE
BOLT
USE ONLY THIS
TYPE AND SIZE
BOLT
Front Tab Slot
8
Washered Bolt
5/16"-18x1/2"
Styrofoam
Rail
Hole
Washered Bolt
Motor Unit
5/16"-18x1/2"
Sprocket
Sprocket Cover
Back Tab Slot
Mounting
Plate