Assembly - Chamberlain HD920EV Manual

Assembly

1 Assemble the rail and trolley
To prevent NJURY 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.
1.1
Assemble the trolley by sliding the inner
trolley into the outer trolley.
1.2
Carefully remove the straight door arm
and hanging brackets packaged inside the
front rail.
1.3
Align the rails on a flat surface as shown.
The front rail has a cut out window near
the end. Make sure that the larger hole on
the front rail is facing up.
1.4
Slide the tapered end of each rail section
into the larger end of the rail section in
front of it. The tabs along the side will lock
in place. All holes in the rail sections
should face up.
1.5
Insert a screwdriver into the hole shown
(this will temporarily keep the trolley from
sliding off the end of the rail).
1.6
Check to make sure that the 4 plastic wear
pads are inside the inner trolley. If they are
missing check all the packing material and
snap them back into place.
1.7
Slide the trolley along the rail toward the
screwdriver as shown.
6
To garage
Outer Trolley
door opener
Inner Trolley
Trolley
Wear Pads