Craftsman 139.53910 - Manual (Page 8)

Assemb/e the Rail & Install the Tielley
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 w indow 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. NO TE: Using the sequence above
the clips will be facing down.
1. Remove the straight door arm and hanging
bracket packaged inside the front rail and set
aside for Installation Step 5 and 12.
NO TE: To
prevent 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.
ASSEMBLY STEP 1 CAUTION
To prevent INJURY from pinching, keep hands and
fingers away from the Joints while assembling the rail.
NO TE: Rail sections may be assembled with the
clips up or down (down is preferred) disassembly of
rail may damage clips.
3. Place the motor unit on packing materia! 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, clamp locking pliers
onto the rail 8" (20 cm) from the center of the idler
pulley hole, as shown.
5. 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.
6. Slide the trolley assembly along the rail from the
back end to the locked pliers.
Idler
Pulley-
Hole
Wear Pads