Assemble The Rail And Install The Trolley; Fasten The Rail To The Motor Unit - Craftsman assurelink 139.54990 Owner's Manual

ASSEMBLY STEP 1

Assemble the Rail and 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. The front
rail has a rail tab. This tab MUST be on the top of the rail when
assembled.
1. Remove the straight door arm and hanging bracket
packaged inside the front rail and set aside for Installation
Step 5 and 9. NOTE: 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.
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 stop, insert a screwdriver into the hole 10"
(25 cm) from the front end of the rail, 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 screwdriver.
7. Slide the rail onto the "U" bracket, until it reaches all the
stops on the top and sides of the "U" bracket.
ASSEMBLY STEP 2

Fasten the Rail to the Motor Unit

1. Insert a 1/4"-20x2-1/2" bolt into the cover protection bolt hole
on the back end of the rail as shown. Install lower spacer and
washer then tighten securely with a 1/4"-20 lock nut. DO NOT
overtighten.
2. Remove the bolt and lock nut from the top of the motor unit.
3. Use the carton to support the front end of the rail.
4. Place the "U" bracket, flat side down onto the motor unit and
align the bracket holes with the bolt holes.
5. Fasten the "U" bracket with the previously removed bolt and
lock nut; DO NOT use any power tools. The use of power tools
may permanently damage the garage door opener.
6. Attach chain spreader to the motor unit with two screws.
HARDWARE SHOWN ACTUAL SIZE
Washer 5/8"
Bolt 1/4"-20x2-1/2"
Lock Nut 1/4"-20
Spacer
To prevent INJURY from pinching, keep hands and fingers away
from the joints while assembling the rail.
Outer Trolley
Inner Trolley
Wear Pads
Idler
Front Rail
Pulley
Section
Hole
(TO DOOR)
To avoid SERIOUS damage to garage door opener, use ONLY
those bolts/fasteners mounted in the top of the opener.
Hex Screws
8-32x7/16"
Bolt
1/4"-20x2-1/2"
Lock Nut
"U" Bracket
Washer 5/8"
Spacer
Cover
Protection
Bolt Hole
Spacer
Washer 5/8"
Lock Nut
1/4"-20
8
"U" Bracket
Trolley
Rail
Tab
Window
Cut-Out
Chain
Bolt
Spreader
Sprocket
To garage
door opener
(TO MOTOR UNIT)
SLIDE TO STOPS
ON TOP AND
SIDES OF
"U" BRACKET