Installation - Chamberlain ML750 Installation And Operating Instructions Manual

11
INSTALL HEADER SLEEVE AND TIGHTEN BELT
Slide header sleeve (1) onto rail (5). Slide flat washer (3), spring (2) and washer (3) onto carriage bolt (4). Thread
nut (6) onto carriage bolt until finger tight. Use an open end wrench (7) to tighten nut until the belt is
approximately 2mm above the base of the rail at its midpoint. DO NOT OVER TIGHTEN THE BELT. See image
below.
1
3
6
2
Wear protective goggles when working overhead to protect your eyes from injury.
Disengage all existing garage door locks to avoid damage to the garage door.
To avoid serious personal injury from entanglement, remove all ropes connected to the garage door
before installing the opener.
NOTE: Where possible it is recommended that the opener be installed 2.1m (7 feet) or more above the floor.
12
POSITION THE HEADER BRACKET
The header bracket must be securely fastened to a
structural support of the garage. Reinforce the wall or
ceiling with a 40mm (1-1/2") board if necessary. Failure
to comply may result in improper operation of safety
reverse system.
You can attach the header bracket either to the header wall
(1) or to the ceiling (3). Follow the instructions that best suit
your particular requirements. With the door closed, mark
the vertical centreline (2) of the garage door. Extend line
onto header wall above the door.
Open door to highest point of travel. Draw an intersecting
horizontal line (4) on header wall 50mm or 200mm above
high point to provide travel clearance for top edge of the
door. Height depends on door type (refer section 15).
13
INSTALL THE HEADER BRACKET
NOTE: Refer to vertical centre and horizontal lines
created in section 12 for proper placement of
header bracket.
A. Wall mount: Centre the header bracket (1) on the
vertical centre 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). Then drill 4.5mm (3/16")
pilot holes and fasten the header bracket with wood
screws (3).
B. Ceiling mount: Extend vertical centre line (2) onto
the ceiling. Centre the header bracket (1) on the
vertical mark no more than 150mm (6") from the wall.
Make sure the arrow is pointing towards the opener.
Mark all of the header bracket holes (5). Then drill
4.5mm (3/16") pilot holes and fasten the header
bracket with wood screws (3). For concrete ceiling
mount, use concrete anchors provided.
1
7
5
4
INSTALLATION SECTION
(50 to 200mm depending on door type)
5
1
4
2
5
200mm
5
50mm
A
1 2
150mm
(6")
3
B
6
3
2
2mm
8
3
2
1
3
4
2 1
3
4