Assemble The Rail And Install The Trolley - Craftsman 139.53920DM Owner's Manual

ASSEMBLY STEP 1
Assemble the Rail & Install the Trolley
To avoid installationdifficulties, do not run the garagedoor
opener until instructedto do so.
To prevent INJURYfrom pinching, keep hands and fingers away
from the joints while assembling the rail.
Thefront raft has a cut out "window" at the door end (see
illustration). The hole above this windowis 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 oppositeedge,about 4-3/4" (12 cm) from the far end.
1. Removethe straight door arm and hanging bracket packaged
inside the front rail and set aside for Installation Step 5 and 12.
NOTE: Toprevent INJURY while unpacking the rail carefully
remove the straight door arm stored within the rail section.
2. Align the rail sections on a flat surface as shown and slide the
tapered ends into the larger ones. Tabs along the side will lock
into place.
3. Placethe 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.
4. As a temporary trolley stop, insert a screwdriver into the hole
10" (25 cm) away from the front of the rail, as shown.
5. Checkto 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.
6. Slide the trolley assembly along the rail from the back end to
the screwdriver.
Trolley
)ered
End
Screwdriver
Window
Cut-Out
Idler
Pulley
Hole
Front Rail
(TO DOOR)
Tapered
End
)ered
End
Tapered
End
Back Rails
(TO MOTOR UNIT)
Outer Trolley
Inner Trolley __
Wear Pads