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Chamberlain HD520EVP - Door Bracket, Arm Connection, and Opener Hanging

Chamberlain HD520EVP
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18
Installation
STEP 9 Connect the door arm to the trolley
Installation will vary according to the garage door type. Followthe instructions which apply to your door.
OPTION A SECTIONAL DOORS
IMPORTANT: The groove on the straight door arm MUSTface away from the curved door arm.
1. Close the door. Disconnectthe trolley by pulling the emergency release handle.
2. Attach the straight door arm to the outer trolley using the clevispin. Secure with the ring fastener.
3. Attach the curved door arm to the door bracketusing the clevis pin. Secure with the ring fastener.
4. Bring arm sections together. Find two pairs ofholes that line up and join sections.Select holes as
far apart as possible to increase door arm rigidity and attach using the bolts,nuts,and lock
washers.
5. Pull the emergencyrelease handle toward the garage door opener until the trolley release arm
is horizontal. The trolleywill re-engage automatically when the garage door opener isactivated.
NOTE: Ifthe holes in the curved door arm and the straight door arm do notalign, reverse the straight
door arm, selecttwo holes (as far apart as possible) and attach using bolts , nuts, and lock washers . Ifthe
straightdoor arm is hanging down too far, you may cut6 inches (15 cm) from the solid end.
HARDWARE
Hex Bolt 5/16"-18x7/8"
Nut 5/16"-18
Lock Washer 5/16" -18
Clevis Pin 5/16"x1" Clevis Pin 5/16"x1-1/4"
Ring
Fastener
Straight
Door Arm
Curved
Door
Arm
(Groove
facing
out)
CORRECT
Straight
Door
Arm
Curved
Door
Arm
INCORRECT
Lock Washer
5/16" -18
Nut
5/16"-18
Hex Bolt 5/16"-18x7/8"
Clevis Pin 5/16"x1-1/4"
Ring Fastener
Clevis Pin
5/16"x1"

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