LiftMaster 8550 8550 Manual - Page 10

Installation 5 Hang the garage door opener To avoid possible SERIOUS INJURY from a falling garage door opener, fasten it SECURELY to structural supports of the garage. Concrete anchors MUST be used if installing ANY brackets into masonry. H4 (2) Lag Screw 5/16"- 18x1-5/8" HARDWARE H9 (2) Lock Washer 5/16"-16 H8 (2) Nut 5/16"-18 H2 (2) Hex Bolt 5/16"- 18x7/8" Hanging the garage door opener will vary depending on your garage. Below are three example installations. Your installation may be different. For ALL installations the garage door opener MUST be connected to structural supports. The instructions illustrate one of the examples below. Finished Ceiling 5.1 On finished ceilings, use the lag screws (H3) to attach a support bracket (not provided) to the structural supports before installing the garage door opener. 5.2 Make sure the garage door opener is aligned with the header bracket. Measure the distance from each side of the garage door opener to the support bracket. 5.3 Cut both pieces of the hanging bracket to required lengths. (not provided) H4 Finished Ceiling H4 Unfinished Ceiling 5.4 Attach the end of each hanging bracket to 5.5 Attach the garage door opener to the 5.6 Remove the 2x4 and manually close the the support bracket with appropriate hanging brackets with the bolts (H2), lock door. If the door hits the rail, raise the hardware (not provided). washers (H9) and nuts (H8). header bracket. (not provided) H2 H9 H8 10