Craftsman 139.53784 Owner's Instructions Manual

I:RRFTSHRN®OWNER'S INSTRUCTIONSiModel 139.53784Eight-Foot Rail Extension Kitdoor opener before proceeding.The _'oflay must he In down (closed door) positionduring s=membly and Installation. If you have acompletely installed garage door opener, the rail/opanerassembly must be taken down. UP and DOWN Limitsmust be readjusted after installation.Opener hanging brackets will require repositioning dueto increased rail length.ff this Is a new Installation, use the front (header) railsection, belt assembly, and longer emergency releaserope in this kit in place of those packaged with yourgarage door opener. Complete the assembly,installation, and adjustment of your opener according toyour Owner's Manual.ff this Is an existing Installation, €ontinue as follows:1. Pull down on the emergency release handle, thendisconnect the trolley from the door arm.2. Disconnect the rail/opener assembly from theheader bracket and hanging brackets, and place iton the floor.3. Remove the belt cap retainer from the openersprocket and set aside.4. Disconnect the master link from the trolley threadedshaft and belt; discard.5. Remove the spring/nut from the trolley and discard.6. Remove idler pulley assembly and set aside.7. Remove the belt assembly and discard.8. Remove the 1/4"-20xl-3/4 bolt and lock nut from thetrolley stop hole (see Figure 1) in the front rail andset aside.9. Push the trolley back toward the opener head.Disconnect the front rail section by using ascrewdriver tip to pry up the outer tab on each sideof the rail, then slide it off the center rail. Discard thefront rail.10. Align the new front rail with the existing rail assembly,keeping the small holes along the same edge, andthe cut out =window" at the front (header) end. Besure to keep it right side up: the idler pulley bolt holeabove the _dndow is /arger on top of the rail than onthe bottom. Slide the front rail onto the assembly;tabs along the side will lock into place.11. As a temporary trolley stop, clamp a locking pliersonto the rail, 8" from the center of the idler pulleyhole, as shown in Figure 2. Slide the trolleyassembly to this point.12. Lay the new belt beside the rail as shown in Figure 3.Grasp the end with the hooked trolley connector andpass approximately 12" of belt through the window,Figure 1F_ure2HoleNIndowCut-OutF_ure33/8"Lock Tro41ey (dl_Connector p_ykeeping the dbbed side toward the rail. Allow it tohang while you complete the next two steps.13. Replace the idler pulley, lock washer and nut. Rotateit to be sure it spins freely. Grease the center ifnecessary.14.Replace the the 1/4"-20xl-3/4 bolt and lock nut intothe trolley stop hole.

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