Chamberlain B550 B550 B552 B750 Owner s Manual - English - Page 20

STEP 9 Connect the door arm to the trolley continued, OPTION B - ONE-PIECE DOORS

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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. HARDWARE Clevis Pin 5/16"x1-1/4" Ring Fastener Clevis Pin 5/16"x1" Lock Washer 5/16" -18 Hex Bolt 5/16"-18x7/8" Nut 5/16"-18 20 Straight Door Arm (Groove facing out) Curved Door Arm One-Piece Door without Track Ring Fastener Ring Fastener Nut Lock Washer Clevis Pin 5/16"x1-1/4" Hex Bolts One-Piece Door with Track Ring Fastener Ring Fastener Nut Lock Washer Clevis Pin 5/16"x1-1/4" Hex Bolts Clevis Pin 5/16"x1" Clevis Pin 5/16"x1"

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20
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.
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
Ring Fastener
Ring Fastener
Ring Fastener
Nut
Nut
Ring Fastener
Lock Washer
Lock Washer
Clevis Pin 5/16"x1-1/4"
Clevis Pin
5/16"x1-1/4"
Hex Bolts
Hex Bolts
Clevis Pin
5/16"x1"
Clevis Pin
5/16"x1"
Straight Door Arm
(Groove facing out)
Curved Door Arm