Chamberlain 7902 K - Manual (Page 8)

8
ASSEMBLY STEP 1
Assemble the Rail
To avoid installation difficulties, do not run the
garage door opener until instructed to do so.
1. Turn the opened rail carton upside down and
empty its contents onto a level work surface.
2. Unfold the rails, taking care to avoid kinking the
screw rod joint.
3. Rotate the rail sections so that the flat side is down
and the screw side is up for all three lengths. Keep
it clean and free of debris while you are working.
Center
Rail
Trolley Rack
Extend
End Rails
Outward
Extend
End Rails
Outward
Rail Assembly
Carton
Remove
Cardboard Packing
Remove
Cardboard
Packing
Rail
Support
Braces
Straight
Door Arm
Rail Assembly
Hardware Bag Chassis Assembly
Hardware Bag
Center Rail
Door End Rail
Rail
Sprocket
Trolley Rack
Sprocket End Rail
Rotate
NOTE: During assembly, avoid pulling the rail section
housing the trolley rack away from the screw rod.
The rack is factory set about 9" from the end of the
screw rod to the center of the rack.
If the plastic liner slides part way out during
assembly, simply push it back in.