How to Set up a LiftMaster

Preparing the Rails and Motor Unit

• 1). Place the foam packaging from the box around the unit. Doing so will aid in assembly and installation. Align the rail assembly with the motor unit and place the coupling over the rail sprocket. Insert the rail through the motor unit bracket until the coupling fits securely over the motor unit sprocket.
  
  
• 2). Line up the two bolt holes on the motor unit bracket with those on the rail. Insert two 1/4-inch-20 x 5/8-inch hex bolts and nuts into the two holes and tighten them with a socket wrench.
  
  
• 3). Slide the trolley onto the bottom of the rail, with the arrow on the trolley pointed away from the motor unit and the trolley release arm horizontal. Slide the trolley along the rail until it snaps firmly into place.
  
  
• 4). Attach the rail brackets to the end of the rail assembly with two 1/4-inch-20 x 5/8-inch hex bolts and lock nuts. Tighten the bolts and nuts with a socket wrench.
  
  

Determining the Header Bracket Location

• 1). Close the garage door. Mark the inside vertical centerline of the garage door with a grease pencil.
  
  
• 2). Extend the line onto the header wall above the door. If the center bearing plate or torsion spring in is the way, you can fasten the header bracket within 4 feet of the left or right of the door center.
  
  
• 3). Open the door to the highest point of travel. Draw an intersecting horizontal line on the header wall 3 inches above the high point for sectional doors and one-piece doors with a track. Alternately, draw it 8 inches above the high point for one-piece doors without a track.
  
  

Assembling the Garage Door Opener

• 1). Install the wall header bracket. Depending on your garage door, you will attach the header bracket to the wall above the door or to the ceiling. Drill 3/16-inch pilot holes with a cordless drill and attach the bracket to the wall or ceiling with lag screws.
  
  
• 2). Position the opener on the garage floor below the header bracket, using the packing material for temporary support. Position the rail bracket against the header bracket and align the bracket holes. Insert a clevis pin through the bracket holes to join the header bracket with the rail bracket. Use the ring fastener to secure the clevis pin.
  
  
• 3). Install the safety reversing sensors. Slip the sensor brackets onto the rounded edge of the garage door track, with the curved arms facing the door. Snap the bracket into place against the side of the track. Slide a carriage bolt head into the slot on each sensor, then mount the sensor onto the brackets. Secure each sensor onto the bracket with a wing nut.
  
  
• 4). Run wires from both sensors to the rail at the door header. Cross and twist the two wires where they meet the rail. Route the wires inside of the channels at the top of the rail to the motor unit. Pull the wires tightly across the top of the motor unit and into the opening above the terminal block.
  
  
• 5). Open the garage door. Remove the foam packaging from the motor unit and mount the unit with the mounting hardware. You might need a step ladder for this step. If mounts from a previous garage door opener are still present, use those instead of the provided mounting hardware.
  
  
• 6). Install the garage door opener's control panel. Strip 7/16-inches of insulation from one end of the bell wire with wire cutters and connect it to the two screw terminals on the back of the door control. Connect the white wire to "2" and the white and red wire to "1". Fasten the control panel to the wall using self-threading screws. Run the bell wire up the wall and across the ceiling to the motor unit. Insert the wires through the opening on top of the motor unit above the terminal block on the back panel. Strip 7/16-inches of insulation from each set of wires and insert them into the quick-connect terminals by color: white wire to white, and white and red wire to red. Separate the white and white and black wires, then connect them to the opener's quick-connect terminals. Twist together the like-colored wires and insert them into the quick connect holes by color: white to white, and white and black to gray.
  
  
• 7). Insert two light bulbs into the sockets at the front of the motor unit. Make sure the wattage for each light bulb does not exceed 100 watts. Place the lens over the motor unit. Install the emergency release rope and handle by threading one end of the rope through the hole in the top of the red handle. Position the rope so "NOTICE" reads right side up. Secure the rope with a knot and thread the other end of the rope through the hole in the release arm of the outer trolley. Adjust the rope length so the handle is at least 6-feet above the floor. Secure the other end of the rope with a knot.
  
  
• 8). Create a permanent connection to your home's electrical system. Remove the motor unit cover screws and set the cover aside. Remove the 3-prong cord and connect the black wire to the screw on the brass terminal. Connect the white wire to the screw on the silver terminal and connect the ground wire to the green ground screw. Reinstall the cover afterwards.
  
  

Adjusting the Garage Door Opener

• 1). Turn on the garage door opener. Loosen the wing nut on the sensor and aim the eye on the sensor it directly at the eye on the other sensor. Lock the sensor in place when finished. Repeat the step for the other sensor. The indicator lights on both sensors will glow steadily once the alignment is correct.
  
  
• 2). Fasten the door bracket on the vertical brace located at the center of the garage door. With the garage door closed, pull the emergency release handle to disconnect the outer trolley from the inner trolley. Slide the outer trolley away from the door. Connect the straight door arm section to the outer trolley and connect the curved door arm to the door bracket. Bring both sections together and fasten both with 5/16-inch -- 18x7/18-inch hex bolts and nuts.
  
  
• 3). Press the "Door Control" push bar and let the opener run through a complete travel cycle. If the doors do not fully open and close, use a slotted screwdriver to turn the limit adjustment screws on the left side of the motor unit.
  
  
• 4). Adjust the amount of force required to open the door with the force adjustment controls at the back of the motor unit. Use a slotted screwdriver to turn the "UP" and "DOWN" knobs.
  
  
• 5). Test the safety sensors by opening the door and placing a cardboard box in between the sensor path. Press the remote control push button to close the door. The door should not move more than an inch and the opener lights should flash.