Sigma ML750 Garage Door Opener User Manual


 
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2
2
1
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14
Attach Rail to Header Bracket
Position opener on garage floor below the header bracket.
Use packing material to protect the cover. Raise rail until
holes in the header sleeve and holes in the header bracket
align. Join with clevis pin (1). Insert ring fastener (2) to
secure.
NOTE: To enable the rail to clear sectional door springs, it
may be necessary to lift opener onto a temporary support.
The opener must either be secured to a support or held
firmly in place by another person.
8
2
50mm
(
2")
3
1
4
B
A
3
6
150mm
(6")
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3
5
5
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5
5
Install the Header Bracket
NOTE: Refer to vertical center and horizontal lines created in step 12 for proper placement of header bracket.
A. Wall Mount: Center the header bracket (1) on the vertical center line (2) with the bottom edge of the header bracket
on the horizontal line (4) (with the arrow pointing toward the ceiling). Mark all of the header bracket holes (5). Drill
4.5 mm (3/16") pilot holes and fasten the header bracket with wood screws (3).
B. Ceiling Mount: Extend vertical center line (2) onto the ceiling. Center the header bracket (1) on the vertical mark no
more than 150 mm (6") from the wall. Make sure the arrow is pointing toward the opener. Mark all of the header
bracket holes (5). Drill 4.5 mm (3/16") pilot holes and fasten the header bracket with wood screws (3). For concrete
ceiling mount, use concrete anchors (6) provided
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