Chamberlain 2000SDC 1/2HP - Manual (Page 23)

All ONE-PIECE Doors
Assemble the Door Arm:
• Fasten the straight and curved door arm sections
together to the longest possible length (with a 2 or 3
hole overlap).
• With the door closed, connect the straight door arm
section to the door bracket with the 5/16"x1-1/4"
clevis pin.
• Secure with a ring fastener.
Adjustment Procedures for One-Piece Doors
On one-piece doors, before connecting the door arm to the trolley the travel limits must be adjusted. Limit adjustment
screws are located on the right side panel as shown on page 24. Follow adjustment procedures below.
Open Door Adjustment:
Decrease UP Travel Limit
' Turn the UP limit adjustment screw counter-clockwise
5 1/2 turns.
' Press the Door Control push bar. The trolley will
travel to the fully open position.
' Manually raise the door to the open position (parallel
to the floor), and lift the door arm to the trolley. The
arm should touch the trolley just in back of the door
arm connector hole. Refer to the fully open
trolley/door arm positions in the illustration. If the arm
does not extend far enough, adjust the limit further.
One full turn equals 2" of trolley travel.
Closed Door Adjustment:
Decrease DOWN Travel Limit
' Turn the DOWN limit adjustment screw clockwise
5 complete turns.
' Press the Door Control push bar. The trolley will travel
to the fully closed position.
' Manually close the door and lift the door arm to the
trolley. The arm should touch the trolley just ahead of
the door arm connector hole. Refer to the fully closed
trolley/door arm positions in the illustration. If the arm
is behind the connector hole, adjust the limit further.
One full turn equals 2" of trolley travel.
Connect the Door Arm to the Trolley:
' Close the door and join the curved arm to the connector hole in the trolley with the remaining clevis pin. It may be
necessary to lift the door slightly to make the connection.
Secure with a ring fastener.
Run the opener through a complete travel cycle. If the door has a slight "backward" slant in full open position as shown
in the illustration, decrease the UP limit until the door is parallel to the floor.
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