Craftsman 139.18451DM Manuel D'instructions page 26

ALL ONE-PIECE DOORS
1. Assemble the door arm, Figure 5:
IMPORTANT: The groove on the straight door arm MUST face
away from the curved 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.
2. Adjustment procedures, Figure 6:
• 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 left side panel as shown on
page 27. Follow adjustment procedures below.
• Open door adjustment: decrease UP travel limit
- Turn the UP limit adjustment screw counter-clockwise
4 turns.
- Press the door control push button. 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" (5 cm) of
trolley travel.
• Closed door adjustment: decrease DOWN travel limit
- Turn the DOWN limit adjustment screw clockwise
4 complete turns.
- Press the door control push button. The trolley will travel to
the fully closed position.
Figure 6
Inner Trolley
Door Arm
Closed
Door
Outer Trolley
Emergency Release Handle
Inner Trolley
Open Door
Figure 5
CORRECT
Straight
Door Arm
(Groove
facing out)
Door
Bracket
Clevis Pin
5/16"x1-1/4"
- 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" (5 cm) of
trolley travel.
3. 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.
NOTE: When setting the up limits on the following page, the door
should not have a "backward" slant when fully open as illustrated
below. A slight backward slant will cause unnecessary bucking
and/or jerking operation as the door is being opened or closed
from the fully open position.
Correct Angle
26
INCORRECT
Straight
Door Arm
Curved
Door Arm
Ring
Fastener
Lock
Washers
5/16"
Straight
Arm
Bolts
5/16"-18x7/8"
Outer Trolley
Door with
Backward Slant
(Incorrect)
Curved
Door
Arm
Nuts
5/16"-18
Curved
Door Arm