User manual CHAMBERLAIN 8810CB

[. . . ] To remove rail pry both end tabs of front rail slightly outward NEW FRONT RAIL Trolley Stop Hole Idler Bolt hole (KEEP LARGER ONE ON TOP) The trolley must be in down (closed door) position during assembly and installation. If you have a completely installed garage door opener, the rail/opener assembly must be taken down. UP and DOWN limits must be readjusted after installation. [. . . ] Align the new front and center rails with the existing rail assembly, keeping the cut out "window" at the front (header) end. Be sure to keep rails right side up: the idler pulley bolt hole above the window is larger on top of the rail than on the bottom. Slide the new center rail onto the assembly, then add the front rail. Tabs along the side will lock into place. As a temporary trolley stop, clamp a locking pliers onto the rail, 8" (20 cm) from the center of the idler pulley hole (Figure 2). Lay the new belt beside the rail (Figure 3). Grasp the end with the hooked trolley connector and pass approximately 12" (30 cm) of belt through the window. Keeping the ribbed side toward the rail, and allow it to hang while you complete the next two steps. Replace the the 1/4"-20x1-3/4" bolt and lock nut into the trolley stop hole. Pull the belt around the idler pulley and hook the trolley connector into the retaining slot on the trolley (Figure 4). With the trolley against the pliers, dispense the remainder of the belt along the rail assembly toward the opener and around the sprocket. Check to make sure the belt is not twisted, then connect it to the flat end of the trolley threaded shaft with the master link (Figure 4): · Push pins of master link bar through holes in end of belt and trolley threaded shaft. Slide clip-on spring over cap and onto pin notches until both pins are securely locked in place. Be sure the belt is not twisted, and the ribbed side faces the rail. Hold the belt at the trolley shaft as you thread the spring nut by hand (Figure 5) onto the shaft until finger tight against the trolley. Insert a screwdriver tip into one of the nut ring slots and brace it firmly against the trolley (Figure 5). [. . . ] Cut the enclosed hanging bracket (cross brace) to fit across the installed hanging brackets. Fasten the cross brace to the top and bottom hole of the hanging brackets (Figures 7 and 8) using 5/16"-18x7/8" hex bolts, 5/16 lock washers and 5/16" -18 nuts. Hanging Bracket (Cross Brace) Not shown actual size [. . . ]