Chamberlain B970 B353 B353C B550 B550C B750 B750C B751C B970 B970C B1381 B1381 - Page 9
Installation 11 - Connect the Door Arm to the Trolley, To continue, go to Installation step 14 in
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Installation For sectional door installations, see Installation step 11 in the Installation Manual. Installation 11 - Connect the Door Arm to the Trolley One-Piece Door Only 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. To continue, go to Installation step 14 in the Installation Manual HARDWARE PP Clevis Pin 5/16"x1-1/4" KK Ring Fastener QQ Clevis Pin 5/16"x1" MM Lock Washer LL Hex Bolt NN Nut 9 Straight Door Arm (Groove facing out) Curved Door Arm One-Piece Door without Track KK KK NN MM L PP M QQ LL 1/2" One-Piece Door with Track KK KK NN MM L M QQ PP 1/2" LL
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