Chamberlain MotorLift ML500, Instruction Manual, Page: 8 / 16

3
2
1
1
4
50mm
50mm
8
2
50mm
(2")
1
4
B
A
3
6
150mm
(6")
1
2
5
5
5
5
5
1
2
2
1
1
2
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.
Clearance between highest point of travel and
Rail should not exceed 50mm and can be zero
when clearance between door and ceiling is
only 30mm.
Attach Rail to Header Bracket
Position the opener on the floor below the mounting
bracket using some packaging material to protect the
unitʼs cover. Raise the rail the holes in the header sleeve
and the holes of the header to align bracket. Use the
clevis pin (1) provided to join the two pieces, then insert
the fastening ring (2) to secure in place.
Note: To enable the rail to clear sectional door springs,
it may be necessary to lift the opener onto a temporary
support. The opener must secured in place by means of
a support or by being held by another person.
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