Chamberlain 1345M - Manual (Page 8)

8
To avoid SERIOUS damage to garage door opener,
use ONLY those bolts/fasteners mounted in the top of the
opener.
ASSEMBLY STEP 1
Fasten the Rail to the Motor Unit
MODELS 1355M AND 1345M ONLY
(For Models 1356M and 1346M see page 9)
• 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.
Washered Bolt
5/16"-18x1/2"
Styrofoam
Rail
Hole
USE ONLY THIS
TYPE AND SIZE
BOLT
Washered Bolt
5/16"-18x1/2" Motor Unit
Sprocket
USE ONLY THIS
TYPE AND SIZE
BOLT
Sprocket Cover
Mounting
Plate
Front Tab Slot
Back Tab Slot
ASSEMBLY STEP 2
Attach the Chain to the Sprocket and
Install the Sprocket Cover
MODELS 1355M AND 1345M ONLY
• 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 5.