Adjustment procedures for one-piece doors – Craftsman 1/2 HP GARAGE DOOR OPENER 139.53978SRT User Manual
Page 27
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Assemble the Door Arm:
• Fasten the straight and curved door arm sections
together to the longest possible length {with a 2 or
3 hole overiap).
• With the door closed, connect the straight door ann
section to the door bracket with the 5/16"x1 -1/4"
clevis pin.
• Secure with a ring fastener.
Ring
-------- Fastener
Nuts
Screws
5/16'-18x7/8
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 28. Follow adjustment procedures below.
Adjustment Procedures for One-Piece Doors
Open Door Adjustment:
Decrease UP limit
• Turn the UP limit adjustment screw counter
clockwise 5-1/2 turns.
• Press the Door Control push bar or 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" of
trolley travel.
Closed Door Adjustment:
Decrease DOWN limit
Turn the DOWN limit adjustment screw clockwise 5
complete turns.
' Press the Door Control push bar or button. 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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