Installation - Chamberlain HD420EVP Owner's Manual

Installation

STEP 9 Connect the door arm to the trolley (continued)
OPTION B
ONE-PIECE DOORS
IMPORTANT: The groove on the straight door arm MUST face away from the curved door arm.
1. Close the door. Disconnect the trolley by pulling the emergency release handle.
2. Fasten the straight door arm and the curved door arm together to the longest possible length
(with a 2 or 3 hole overlap) using the bolts, nuts, and lock washers.
3. Attach the straight door arm to the door bracket using 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.
Clevis Pin 5/16"x1-1/4"
Ring Fastener
HARDWARE
Clevis Pin 5/16"x1" Hex Bolt 5/16"-18x7/8"
Lock Washer 5/16" -18 Nut 5/16"-18
CORRECT
Straight
Door Arm
(Groove
facing out)
One-Piece Door without Track
Ring
Fastener
Nut 5/16"-18
Lock Washer 5/16" -18
Clevis Pin 5/16"x1-1/4"
One-Piece Door with Track
Ring
Fastener
Lock Washer 5/16" -18
Clevis Pin
5/16"x1-1/4"
19
INCORRECT
Straight
Door
Arm
Curved
Door
Arm
Ring Fastener
Hex Bolt 5/16"-18x7/8"
Ring Fastener
Nut 5/16"-18
Hex Bolt 5/16"-18x7/8"
Curved
Door
Arm
Clevis Pin
5/16"x1"
Clevis Pin
5/16"x1"