LiftMaster 8557 8557 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. Attach with Slide the outer trolley back (away from the ring fastener. the door) about 2" (5 cm). Ring Fastener Clevis Pin 5/16" x 1" 9.3 Attach the curved door arm to the door bracket using the clevis pin. Attach with the ring fastener. Ring Fastener Clevis Pin 5/16" x 1-1/4" HARDWARE Hex Bolt 5/16"-18x7/8" Nut 5/16"-18 Clevis Pin 5/16"x1" Ring Fastener 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, nuts and lock washers. Nut 5/16" - 18 Lock Washer 5/16" Lock Washer 5/16" Clevis Pin 5/16"x1-1/4" Hex Bolt 5/16" - 18 x 7/8" 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 trolley release arm is horizontal. The bolts, nuts and lock washers. trolley will re-engage automatically when the garage door opener is activated. Nut 5/16" - 18 Lock Washer 5/16" Hex Bolt 5/16" - 18 x 7/8" If the straight door arm is hanging down too far, you may cut 6 inches (15 cm) from the solid end. Trolley release arm 13