Chamberlain 7710CB 7710CB FOR CHAIN DRIVE OPERATORS - Page 1

BEFORE YOU BEGIN: • 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. • Opener hanging brackets will require repositioning and the addition of an extra bracket for stability due to increased rail length. IF THIS IS A NEW INSTALLATION: Use the front (header), chain/cable assembly, and longer emergency release rope in this kit in place of those packaged with your garage door opener. Add the enclosed center rail as the second rail section, creating a five piece rail assembly. Complete the assembly, installation, and adjustment of your opener according to your owner's manual, with the exception of adding an additional hanging bracket for stability. IF THIS IS AN EXISTING INSTALLATION, CONTINUE AS FOLLOWS: 1. Disconnect power to opener. 2. Pull down on the emergency release handle, then disconnect the trolley from the door arm. 3. Disconnect the rail/opener assembly from the header bracket and hanging brackets, and place it on the floor. 4. Remove the outer nut (Figure 1) from the trolley shaft and set aside. 5. Disconnect the two master link assemblies from the trolley (Figure 1) and discard. 6. Remove idler pulley assembly and set aside. 7. Remove the chain/cable assembly and discard. 8. Push the trolley back toward the opener. Disconnect the front rail and second rail sections by using a screwdriver tip to pry up the outer tab on each side of the rail (Figure 2), then slide it off the existing rail assembly. Discard the front and second rails. 9. 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. 10. As a temporary stop, insert a screwdriver into the hole 10" (25 cm) from the front end of the rail (Figure 1). Slide the trolley assembly to this point. 11. Locate the rail tab. Use a flathead screwdriver and lift the rail tab until the tab is vertical (90°) (Figure 2). 12. Refer to your owner's manual to complete the assembly, re-installation and adjustment of your opener. NOTE: Before hanging the opener, an additional hanging bracket is necessary for stability. See Adding An Additional Hanging Bracket on reverse side. (Replace the old emergency release rope with the new, longer replacement rope.) 13. Reconnect power. 14. Make adjustments and test the safety reversal system according to the owner's manual. Ten-Foot Rail Extension Kit Model 7710CB To prevent possible SERIOUS INJURY or DEATH: • Disconnect ALL electric and battery power BEFORE performing ANY service or maintenance. The garage door MUST be in the fully closed position during installation. Figure 1 Front Rail Section Outer Nut Master Link Inner Lock Nut Washer Threaded Shaft Master Link Figure 2 Idler Pulley To remove rail pry both end tabs of front rail slightly outward NEW FRONT RAIL Rail Tab Rail Tab CORRECT INCORRECT Idler Bolt hole (KEEP LARGER ONE ON TOP)