LiftMaster 87504-267 Owners Manual - English - Page 10
Assembly
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Assembly 1 Attach the Belt Rail to the Garage Door Opener 87504-267, 84505R To avoid possible SERIOUS INJURY to finger from moving garage door opener: • ALWAYS keep hand clear of sprocket while operating opener. • Securely attach sprocket cover BEFORE operating. To avoid SERIOUS damage to garage door opener, use ONLY those bolts/fasteners mounted in the top of the opener. NOTE: ONLY use the bolts removed from the garage door opener. Place the garage door opener on the packing material to prevent scratching. 1. Models 87504-267 and 84505R Remove the two bolts from the top of the garage door opener. 2. Align the holes in the rail with the holes in the garage door opener.. 3. Fasten the rail with the previously mentioned bolts. Cut away and discard the tape and Styrofoam from around the rail. 4. Position the belt around the garage door opener sprocket. 5. Position the sprocket cover over the garage door opener sprocket and attach with hex screws. HARDWARE 2 Tighten the Belt 1. Insert a flathead screwdriver tip into one of the nut ring slots and brace it firmly against the trolley. 2. Tighten the spring trolley nut with an adjustable wrench or a 7/16" open end wrench about a quarter turn until the spring releases and snaps the nut ring against the trolley. This sets the spring to optimum belt tension. 1 (To motor unit) Spring Trolley Nut 2 Nut ring slot 3 Nut Ring BEFORE 1" (2.5 cm) Nut Ring AFTER RELEASE 1-1/4" (3.18 cm) Washered Bolt 5/16"-18x1/2" (Mounted in the garage door opener) Models 87504-267, 84501 Hex Screw #8x3/8" (Packed with the belt cover) Washered Bolt 5/16"-18x1/2" Hex Screw #8x3/8" 10