How to Install Push Down Spring Bumpers - DDM Garage Doors Blog

Posted June 22nd, 2018 at 5:28 pm by Dan Musick

A 27-inch push down spring bumpers for installing on standard lift doors with jackshaft operators.

Why are Spring Bumpers Needed?

Spring bumpers are often needed on residential garage doors to help assist the door to close from the open position when a jackshaft opener, such as the Liftmaster 8500, is used. Therefore, it is important to install push down spring bumpers, when necessary.

Without this extra thrust, the cables are likely to peel off the drums as the opener initially turns the torsion shaft, especially if the rollers are dry or if the door binds in the open position.

I tested the amount of force required to compress the 27-inch spring bumper by standing on an analog scale and seeing how much weight I lost.

A garage door professional testing the compression on a 27-inch spring bumper by using an analog scale.

I weigh about 160 with my tool pouch. When I compressed the spring to its maximum, I lost 60 pounds of my weight.

A view of a man standing on an analog scale to determine the compression of a spring bumper.

Two of these bumpers, completely compressed, would require 120 pounds of opener force to open a garage door to its normal position. That is too much. Over time it will create excessive wear on the opener, and it could also damage the door.

Rather than compress the bumper all the way, it is safer to limit the compression to 1/3 of the rod length. On this 27-inch spring bumper, we limited compression to nine inches.

An image of a man holding a spring bumper with a tape measure indicating nine inches of spring compression.

This gave us a compression of about 30 pounds. Except for some of the lighter, flimsier doors, this should work fine.

Another view of a man standing on an analog scale pushing down on the bracket of a spring bumper.

Instructions for Installing Spring Bumpers

One spring bumper is for the left side, and the other is for the right side. The bracket mounts to the outside of the horizontal track as pictured. Using c-clamps or c-vise-grips, temporarily install the pusher springs as far back on the horizontal track as you can go.

A garage door professional installing a spring bumper bracket using a c-clamp on a horizontal track.

Raise the door and align the bumper with the top left corner of the door.

The garage door is being raised and the spring bumper is aligned.

Go to the other side and install the other bumper as you did on the first side. IMPORTANT: The spring bumpers must always be evenly spaced to prevent cables from coming off the drums as the door opens.

A garage door professional installing a spring bumper on a horizontal track using a c-clamp.

Adjust for proper compression

With the opener engaged, open the door to its normally open position. If it doesn’t open all the way, measure the length of compression. If it is less than one third the length of the rod, adjust the opener force just enough to get the door to open completely. This door opened completely, but the compression is only eight inches.

A garage door professional measuring the length of compression using a tape measure that shows 8-inches.

Since we want an extra inch of compression, we will move the bumper an inch closer to the top of the door. To do this, mark the necessary distance needed for moving the bumper. Here we marked an inch.

A garage door professional marking of 1-inch on the horizontal track.

Then, move the bumper one inch and grip it into place.

A garage door professional moving the spring bumper 1-inch to finish installing it.

Adjust the bumper as needed to align it with the top corner of the door.

A man's hand is aligning the spring bumper with the top corner of the garage door to continue installing the bumper.

Drill two holes with a 3/8 inch bit. Drill at the ends of the slots closer to the door.

A man drilling holes in the horizontal track using a 3/8 inch drill bit.

Afterward, secure the bracket with a 3/8 inch bolt and nut.

A man is securing the bracket with a 3/8 inch bolt and nut.

Drill the second hole at the end of the slot closer to the door. Should the nut come loose in the future, the bracket will not move. This will prevent the cables from coming off the drums when the door opens.

A man drilling a hole closer to the door so that the spring bumper bracket will not move.

Then, secure the bracket with a second 3/8 inch bolt and nut.

A man is securing the spring bumper bracket with a 3/8 inch bolt and nut to finish installing it.

Adjust and Align Spring Bumpers

Repeat this process on the opposite side. Adjust the bracket as needed, align the bumper with the top corner of the door, and secure the bracket with two 3/8 inch bolts and nuts.

A garage door professional adjusting the spring bumper bracket using a c-clamp.

There are some applications where the horizontal tracks are not long enough for mounting a spring bumper. When this is the case, you can move the bumper further into the garage by adding a two-inch angle to the inside ends of the horizontal tracks.

A horizontal garage door track with a 2-inch angle added to the inside of the track.

The coils rattle as they are compressed. For quietness, lube the entire length of the rod with a 40 weight oil or light grease. For more tips on lubricating the rest of your door, watch our YouTube video on “How to Lubricate Your Garage Door.”

A garage door professional with an oil can in his hand shown lubricating the rod of the spring bumper.

If we can help answer any question about installing your push down spring bumpers, please contact us.

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