Assembly Step; Assemble The Rail And Install The Trolley - Chamberlain A1633M Additional Instruction Manual

ASSEMBLY STEP 1

Assemble the Rail & Install
the Trolley
To avoid installation difficulties, do not run the
garage door opener until instructed to do so.
The front rail has a cut out "window" at the door end
(see illustration). The hole above this window is
larger on the top of the rail than on the bottom. A
smaller hole 3-1/2" (8.9 cm) away is close to the rail
edge. Rotate the back rail so it has a similar hole
close to the opposite edge, about 4-3/4" (12 cm)
from the far end. A 3-piece rail uses two back rails.
1. Align the rail sections on a flat surface exactly as
shown and slide the tapered ends into the larger
ones. Tabs along the side will lock into place.
2. Place the motor unit on packing material to protect
the cover, and rest the back end of the rail on top.
For convenience, put a support under the front
end of the rail.
KEEP SMALL
HOLES ALONG
OPPOSITE
EDGE
OF RAILS
BACK RAIL
(TOP)
Tapered
End
Locking Pliers
Tabs
KEEP LARGER
HOLE ON TOP
FRONT RAIL
(TOP)
8" (20 cm) Distance from
Idler Pulley Hole
3
WARNING
In order to ensure the proper operation of your safety
reverse feature, replace the assembly instructions in
CAUTION
your Owner's Manual with the following assembly steps.
3. As a temporary trolley stop, clamp a locking pliers
onto the rail, 8" (20 cm) from the end of the back
rail, as shown.
AVERTISSEMENT
4. Check to be sure there are 4 plastic wear pads
inside the inner trolley. If they became loose
during shipping, check all packing material. Snap
them back into position as shown.
ATTENTION
5. Connect the inner and outer trolleys as shown.
6. Slide the trolley assembly along the rail from the
front end to the locked pliers.
Idler
Pulley
Hole
Tabs
Inner Trolley
Back Rails
Wear Pads
(TO MOTOR
UNIT)
Trolley
Window
Cut-Out
Front Rail
(TO DOOR)
Outer Trolley