Chamberlain HD920EV User Manual

5
Assembly
STEP 1 Assemble the rail and trolley
To preventINJURY from pinching, keep hands and fingers away from the joints while assembling the
rail.
To avoid installation difficulties, do not run the garage dooropener until instructed to do so.
The front rail has a cut out“window” at the door end (see illustration). The hole above this window 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 backrail so it hasa similar hole close to the opposite edge, about 4-3/4" (12 cm) from
the far end.
1. Remove the straightdoor arm and hanging bracketpackaged 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 asshown and slide the tapered endsinto the larger
ones. Tabs along the side will lockinto place.
3. Place the motor unit on packing material to protectthe cover,and rest the back end ofthe rail
on top.For convenience, put a supportunder 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. Ifthey became loose
during shipping, checkall 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 itreaches all the stops on the top and sides ofthe “U”
bracket.
To garage
door opener
(TO MOTOR UNIT)
Front Rail
Section
(TO DOOR)
“U” Bracket
Outer Trolley
Inner Trolley
Wear Pads
Rail
Tab
Trolley
Window
Cut-Out
SLIDE TO STOPS
ON TOP AND
SIDES OF
“U” BRACKET
Idler
Pulley
Hole

Chamberlain HD920EV Specifications

General

Brand	Chamberlain
Model	HD920EV
Category	Garage Door Opener
Language	English