Sears 139.53975SRT1 - Manual (Page 8)

assembly step 1
Assemble the Rail & Install the Tmiley
To avoid installation difficulties, do not run the
garage door opener until instructed to do so.
CAUTION
To prevent INJURY from pinching, keep hands and
fingers away from the joints while assembling the rail.
The front rail has a cut out “window” at the door end
(see iiiustration).
The hole above this window is
larger on the top of the rail than on the bottom. A
smaller hole 3-1/2" away is close to the rail edge.
Rotate the back rail so it has a simiiar hoie dose to
the
opposite edge, about 4-3/4" from the far end. A
3-piece rail uses two back rails.
1. Remove the straight door arm and clevis pin
packaged inside the front rail and set aside for
Installation Step 12.
2. Align the raii sections on a fiat surface exactly as
shown and slide the tapered ends into the larger
ones. Tabs along the side will lock into place.
3. 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.
4. As a temporary trolley stop, clamp a locking pliers
onto the raii, 8" from the center of the idler pulley
hoie, 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. Connect the inner and outer trolleys as shown.
7. Slide the trolley assembly along the rail from the
back end to the locked pliers.