Chamberlain MotorLift ML500, Instruction Manual

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Fasten Door Bracket
A. Place Door Bracket (2) on the top of the door (3) and center over Vertical Center Line (1). Mark the two rear top
holes. Drill 4mm holes.
B. Mark the two top front holes. Drill 4mm holes. Fasten Door Bracket (2) to the top of the door (3) using Screws (4)
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Hang Opener
Bend Hanging Brackets (1) so they are flat against ceiling. Measure distance from Header Bracket to Ceiling Mounting
Bracket Bolts. Mark length on ceiling starting at the Header Wall, along this point is where the unit will be mounted. Lift
door to full open position, rest opener on door. Insert Square Head Screws (A) into Rail assembly (B) approximately
120mm from end of Rail near motor unit. Slide Hanging Brackets on to Square Head Screws and secure Brackets with
Nuts (5). In this process the Square Head Screws hook into slots on the sides of Rail by turning 90° (C). For concrete
ceilings, drill 8mm pilot holes into ceiling and insert Concrete Anchors (2). Secure Hanging Brackets to ceiling with Lag
Screws (3). For wood ceilings, drill 4mm pilot holes and secure with Lag Screws (3).
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