Chamberlain WD832KD 1/2 HP 用户手册

Window
Cut-Out

Screwdriver

Idler
Pulley
Hole

Tabs

Trolley

Tapered
End

Tapered
End

Inner Trolley

Wear Pads

Outer Trolley

Tapered
End

Tapered
End

KEEP LARGER
HOLE ON TOP

8

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 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 
back rail so it has a similar hole close to the opposite 
edge, about 4-3/4" (12 cm) from the far end.
1.  Remove the straight door arm and hanging bracket 

packaged inside the front rail and set aside for 
Installation Step 5 and 12. 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.