Chamberlain B550 B550 B552 B750 Owner s Manual - English - Page 6

Assembly, STEP 1 Assemble the rail and install the trolley

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Assembly STEP 1 Assemble the rail and install the trolley To prevent INJURY from pinching, keep hands and fingers away from the joints while assembling the rail. 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 rail tab MUST be on 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 in the second rail section from the motor unit, 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 toward the screwdriver as shown. 7. Slide the rail onto the "U" bracket, until it reaches all the stops on the top and sides of the "U" bracket. Rail Tab On Top Slide to stops on top and sides of "U" bracket Screwdriver "U" Bracket (TO MOTOR UNIT) Trolley Front Rail Section (TO DOOR) 6 Wear Pads

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6
Assembly
STEP 1 Assemble the rail and install the trolley
To prevent INJURY from pinching, keep hands and fingers away from the joints while assembling the rail.
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 rail tab MUST be on 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 in the second rail section from the motor unit, 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 toward the screwdriver as shown.
7.
Slide the rail onto the “U” bracket, until it reaches all the stops on the top and sides of the “U” bracket.
Wear Pads
Front Rail Section
(TO DOOR)
“U” Bracket
(TO MOTOR UNIT)
Trolley
Rail Tab
On Top
Slide to stops
on top and sides
of “U” bracket
Screwdriver