Detach the Bracket
To begin, remove the old garage door opener. Glance at the end of the rail that hides the screw, belt or chain to find the manual pull handle and the bracket to which it attaches. Detach the bolt and nut or clevis and cotter pin that attach the bracket to the door. Follow the bracket arm up to where it attaches on the rail; remove the bolts and nuts with a ratchet and socket while holding the bold head with a wrench.
Garage Door Motor Removal
Get rid of the safety lenses on either side of the door. Remove the wiring from both at the lens by removing the screws that hold the wires in place. Repeat this step on the motor itself where the wires attach on a series of screws at the top or side of the motor. After completely removing these and the wire that secures to the control unit near the door that enters the house, pull the rail from the bracket above the garage door after removing the fastener that holds it in place. Unhook the garage door opener from the metal straps or angle iron that anchors it to the ceiling.
Assemble the Rail
The brand new motors requires assembly before you install it. Install the first rail into the motor or power head unit of the garage door opener. Connect with the couples and the bolts provided with the kit, until the rail is complete. The screw, chain or belt that opens the door sits inside the rail. The stop switches to the rail that turn the garage door opener off, an approximately 12-14 inches from the motor and the other the same distance from the end of the rail.
Install the New Motor
Insert the end of the rail in the bracket that held the old opener above the garage door and secure it with the fastener, bolts, clevis pin. Put the the new motor in the same location as the old one. You might need some assistance when holding the motor up while you secure it in place with the bolts and nuts through the metal strap or angled steel. Set it on two stepladders, one to support the motor and one to support the rail. Make certain the motor and rail are level when you install them. Adjust when necessary by raising or lowering the motor and reattaching it.
Attach the Wiring
Attach the wiring from the unit to the push button control next to the entry garage door. Attach the new wires to the safety lenses with a screwdriver and install them on either side of the garage door’s moving parts. Reinstall the bracket that attaches the rail to the door. Use the old equipment on the door to install the bracket or install the new one. Reinstall the bracket to the rail. Test the new opener and adjust the stops on the railing as necessary to ensure the door opens and closes properly. Ensure that the safety lenses are properly aligned and adjust as necessary.