LiftMaster 8550 8550 Manual - Page 13

9 Connect the door arm to the trolley IMPORTANT: The groove on the straight door arm MUST face away from the curved door arm. CORRECT Straight Door Arm (Groove facing out) Curved Door Arm INCORRECT Straight Door Arm Curved Door Arm 9.1 Close the door. Disconnect the trolley by 9.2 Attach the straight door arm to the outer pulling the emergency release handle. trolley using the clevis pin (H7). Attach Slide the outer trolley back (away from with the ring fastener (H11). the door) about 2" (5 cm). H11 H7 9.3 Attach the curved door arm to the door bracket using the clevis pin (H6). Attach with the ring fastener (H11). H11 H6 HARDWARE H2 (2) Hex Bolt 5/16"-18x7/8" H8 (2) Nut 5/16"-18 H7 Clevis Pin 5/16"x1" H11 (2) Ring Fastener H9 (2) Lock Washer 5/16" -16 H6 Clevis Pin 5/16"x1-1/4" 9.4 Align the straight door arm with the curved door arm. Select two aligned holes (as far apart as possible) and attach using the bolts (H2), nuts (H8) and lock washers (H9). H8 H9 H2 NOTE: If the holes do not line up, reverse the 9.5 Pull the emergency release handle straight door arm. Select two aligned holes (as toward the garage door opener until the far apart as possible) and attach using the bolts trolley release arm is horizontal. The (H2), nuts (H8) and lock washers (H9). trolley will re-engage automatically when the garage door opener is activated. . H8 H9 H2 If the straight door arm is hanging down too far, you may cut 6 inches (15 cm) from the solid end. 13 Trolley release arm