Chamberlain HD920EV - Installation

19
Installation
STEP 9 Connect the door arm to the trolley (continued)
OPTION B ONE-PIECE DOORS
IMPORTANT: The groove on the straightdoor arm MUST face away from the curved door arm.
1. Close the door. Disconnectthe trolley by pulling the emergency release handle.
2. Fasten the straightdoor arm and the curved door armtogether to the longestpossible length
(with a 2 or 3 hole overlap) using the bolts,nuts,and lock washers.
3. Attach the straightdoor arm to the door bracketusing the clevis pin. Secure with the ring
fastener.
4. Attach the curved door arm to the trolley using the clevis pin. Secure with the ring fastener.
5. Pull the emergency release handle toward the garage door opener until the trolley release
arm is horizontal.
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
One-Piece Door without Track
One-Piece Door with Track
Straight
Door Arm
Curved
Door
Arm
(Groove
facing out)
CORRECT
INCORRECT
Straight
Door
Arm
Curved
Door
Arm
Ring
Fastener
Ring Fastener
Nut 5/16"-18
Nut 5/16"-18
Ring
Fastener
Ring Fastener
Lock Washer 5/16" -18
Lock Washer 5/16" -18
Clevis Pin 5/16"x1-1/4"
Clevis Pin
5/16"x1-1/4"
Hex Bolt 5/16"-18x7/8"
Hex Bolt 5/16"-18x7/8"
Clevis Pin
5/16"x1"
Clevis Pin
5/16"x1"