How to Assemble and Install a Chamberlain Chain Drive Garage Door Opener in Just 2 Hours – (VIDEO)


This video demonstrates how to assemble and install a Chamberlain Chain Drive garage door opener in a garage with a sectional door and a finished ceiling. These steps apply to all recent Chamberlain chain drive garage door opener models so your product may appear different from what is in the video.

How to Assemble and Install a Chamberlain Chain Drive Garage Door Opener

How to Assemble and Install a Chamberlain Chain Drive Garage Door Opener

Getting Started With Your Chamberlain Chain Drive Opener

You’ll begin by assembling your Chamberlain chain drive garage door opener and then you’ll install it. You should plan to set aside a couple of hours, but you may need more time before beginning.

Check the door’s balance to make sure it moves freely and does not drift. An unbalanced door may prevent your garage door opener from functioning properly. Your garage door should also have horizontal and vertical reinforcements already installed. These provide support and help prevent damage to the door.

Before you assemble your Chamberlain chain drive garage door opener, it’s good to lay out the parts. They include the motor unit, the rail and trolley assembly with chain, the header and door mounting brackets, and the other parts, including hardware.

Refer to your manual for a list of tools and additional items you may need. The support bracket for mounting the motor unit to the ceiling is not provided. You’ll also need to supply light bulbs.

Begin by placing your garage door opener on protective cardboard and setting it on the floor about 10ft away from the garage door.

Assembling The Rail

Chamberlain chain drive rail
Chamberlain chain drive rail

To assemble the rail, carefully remove the door arm and hanging bracket parts. Layout the rail sections on the floor with the tapered ends pointing toward the garage door. The front rail section with the window goes on the door end of the rail. Make sure the cutout rail tab is on top.

Slide the tapered ends of the rails into the larger ends. Placing the rail on top of packing material and the motor unit will help with assembly. Insert a screwdriver into the hole in the second rail section from the motor unit at the motor unit end of the rail. Slide the trolley assembly toward the screwdriver, ensuring the release lever points toward the motor unit. Insert the EU bracket with the flat side down. Push firmly until it reaches the stop. Use a Mallet to assist if needed.

Installing The Rail

Install the cover protection bolt, making sure not to over-tighten. Remove the bolts from the top of the motor unit and use them to attach the U bracket to the motor unit. When mounting the bracket hand, tighten the bolts. Do not use power tools. Attach the chain spreader to the motor unit with two screws.

Feed the cable through the window on the front rail before inserting the idler pulley. Secure the idler pulley in place with the provided hardware. Use a flathead screwdriver to lift the cutout rail tab to a 90-degree angle.

chamberlain chain and cable
Chamberlain chain and cable

Installing The Chain and Cable

Connect the cable to the trolley. Using the master link, pull the other end of the chain until the trolley rests against the screwdriver. Extend the chain and wrap it around the sprocket on the motor unit. Make sure the sprocket teeth engage the chain and it is not twisted. Make sure the cable is around the cable pulley.

Connect the chain to the threaded shaft using the master link hardware. Thread the inner nut and lock the washer onto the threaded shaft. Insert the threaded shaft through the hole in the trolley. Loosely thread the outer nut onto the threaded shaft, leaving a little slack.

Tightening The Chain

Now that the chain is installed, remove the screwdriver from the rail. The chain needs to be tightened so that the bottom of the chain rests about one-quarter inch above the base of the rail. Tighten the outer nut until the chain is at the proper height. When the chain has been adequately tightened, secure the inner nut. Your garage door opener is ready to install.

Header Bracket

The header bracket will be centered over the garage door and fastened to structural support. Do not attach the header bracket over drywall. If there is a header bracket already adequately installed, use it if possible. Raise the garage door to the highest point of travel and make a Mark two inches above this. Using a level is helpful. With the door closed, place the bottom of the header bracket on your Mark and make marks for pilot holes. Be sure to refer to the instruction manual for the correct drill bit size. Install the header bracket using the provided hardware.

How to Assemble and Install a Chamberlain Chain Drive

Installing Your Chamberlain Chain Drive Garage Door Opener

It’s time to place the assembled Chamberlain chain drive garage door opener into position. You may find it easier to have a helper. Use a ladder to support the motor unit and a second ladder or step stool to reach the header bracket. Connect the rail to the header bracket using the clevis pin and secure it in place with a ring, open the garage door and place a two X four under the rail. This will put the motor unit at the proper height for connecting to the support bracket.

If a properly installed support bracket is not already in place, you must supply one along with the hardware for fastening it to the structural supports in the ceiling. We’ve already drilled pilot holes into the structural supports, and now we’re attaching the support bracket in a place centered over the garage door opener. Measure the distance from the support bracket to the garage door opener. Measure and cut the hanging bracket.

Connect the hanging bracket to the garage door opener and the support bracket. Remove the two by four and lower the garage door. Install the light bulbs. Thread the emergency release rope through the handle and tie it off.

Then, install the emergency release rope to the trolley, making sure the handle is within reach but at least 6ft above the floor, being sure to avoid contact with vehicles. This is to prevent accidental release.

If your garage door is made of lightweight material such as fiberglass, aluminum, or light steel, make sure both horizontal and vertical reinforcements are installed. Before attaching the door bracket, the door bracket will be centered under the header bracket. Attach it to the vertical reinforcement on the top panel.

Position the top edge of the door bracket two to four inches below the top edge of the door or directly below any structural support across the top of the door. It attaches to the vertical reinforcement on the top panel using the provided hardware. If there is a door bracket already correctly installed, it’s easier to use that the outer trolley needs to be close to the garage door, so you can install the door arm. If you need to move it, disconnect the trolley by pulling down on the emergency release handle and slide the trolley over to the door.

The door arm consists of a curved section and a straight section. Use the provided clevis pins to connect the straight door arm to the trolley and the curved door arm to the door bracket. Align the curved and straight arms so they appear to be positioned between one and two o’clock. Use the provided hardware to connect the two parts.

Installing Safety Sensors

Your installation is not complete until the protector system has been installed. The protector system consists of safety reversing sensors which are mounted on each side of the garage door at floor level. Safety reversing sensors are to be installed no more than six inches from the floor.

Chamberlain Replacement Opener Garage Door Safety Sensors

Snap the sensor bracket onto the door track then mount the safety reversing sensor using the provided wing nut and bolt. If your garage is not pre-wired for safety sensors follow the instructions for routing the wires that are attached to the sensors.

Insert the white wire in the white connector and the black wire in the grey connector.

Installing The Wall Console (Push Button)

Your Chamberlain chain drive opener comes with one of the following wall controls:

  • Single Button
  • Muli-Function
  • Multi-Function LCD

It should be mounted within sight of the door and a minimum height of 5 feet above floor landings steps or any other adjacent walking surface so small children are not able to reach it and away from moving parts of the garage door.

Wire the door control to the motor unit by inserting the white wire into the white connector and the red wire into the red connector.

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