1. Garage door springs do almost all of the work of lifting your door regardless of the door being manually or automatically operated. The spring makes it possible for anyone to lift a product that might weigh one hundred pounds on the low end and many hundreds of pounds on the high end. Not only can anyone lift it – most can do it with one hand! In other words, the garage door spring does a lot of work.
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Guest 9232954 -- check out the other answers for this question, and the links below the answers for even more - seems from $125-400 range from different contributors (should be replaced in pairs for balanced lifting unless one spring is quite new), about $200-250 or 300 seems a common charge. The springs themselves generally run about $20-50 each depending on lead they have to carry.
Garage door springs can —and will—break, and if you're anywhere near the garage when this happens, you'll know it. Nothing else sounds quite like a giant metal spring snapping under tension. Even if you don't hear it, you'll know the spring broke as soon as you (or your garage door opener) try to lift the door and finds that it now weighs twice as much. So faced with a broken garage door spring, the question is, can you fix it yourself?
CAUTION! Replacing garage door torsion springs is dangerous because the springs are under tension. If you do not use the right tools and follow safe procedures, you could lose hands, limbs or even your life. You could also damage property. We want your business, but not at the expense of your well being. Doing the job right is your responsibility. If you have any doubts about your ability to safely change your springs, we recommend you hire a professional to repair your garage door. Safety First! Then work. 

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The winding and unwinding is done at a metal fitting, called a winding cone, attached to the outside end of the spring. You stick a winding bar into one of the four holes in the cone and use the bar as a lever to turn the cone. Once you've completed a quarter turn, insert the other bar into a different hole in the cone and let the bar lever against the closed garage door to hold the spring tension. This allows you to move the original bar to repeat the process, alternating the bars with each quarter-turn. It takes about 30 quarter-turns to fully tension a standard torsion spring. https://youtube.com/e/Z_eZc-kh40c
Traditional One Panel: These doors consist of one large panel which tilts to open by employing a spring mechanism to swing upward. The wood version is popular in the South and Southeastern US, where a milder climate keeps the wood from rapidly deteriorating. Traditional garage door designs include Cape, Colonial, Ranch, Tudor and Craftsman. The disadvantage is these doors require a lot of clearance to operate correctly. Sometimes repairs can be difficult because of the heaviness of the door or its inaccessibility. Average cost to repair tilt-up doors is $172.

Doors with extension springs have two sets of pulleys (which are sometimes called sheaves): one at the end of each spring and one at the top of the vertical door track. They also have two cables on each side. One cable attaches to the bottom of the door, runs up and over the pulley above the door and around the spring pulley and then attaches to the door track bracket. The other cables are safety cables that run through the middle of the springs and are fixed to a track bracket at both ends. These cables restrain the springs if they break under tension. All extension springs must have safety cables.

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10The type of garage door shown provides the necessary lift assistance with a “torque tube.” If you intend to use an opener, wait to install the tube. Otherwise, install the torque tube according to the manufacturer’s directions. Roll up the door about 4 feet to check for the alignment of the tracks, and make any adjustments. Then tighten all fasteners.

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Garage door springs come in two styles: torsion (see above), which mounts on the header above the door, and extension (Photo 1), which floats above the upper roller track. In the past, extension springs were safer to install but didn’t have containment cables running through the center of the spring. Without cable, these springs become dangerous, heavy whips when they break. They also tend to be noisier than torsion springs, and we recommend you use them only if you don’t have the 12 in. of headroom above the door that a torsion spring requires. https://youtube.com/watch?v=Z_eZc-kh40c&app=desktop
If you have two torsion springs on your garage door, the good spring will most likely keep the cables on the drums when the other spring breaks. This makes it much easier to lift because the good spring will be pulling half the weight of the garage door. You can also use the garage door opener to help assist while someone lifts the door and acts as the broken spring. Use extreme caution when doing this to prevent damage to your garage door or injury to a person.

Next, check to see if your garage door operator is the problem. Do this by pulling the emergency release cord when the door is in the down position (so the door doesn’t come crashing down in case there is a problem). Then, try to lift the door up manually. Does it open easily? If so, your opener is probably at fault. If it still doesn’t move, the problem likely lies with your tracks, springs, or rollers.
Mechanical garage door openers can pull or push a garage door with enough force to injure or kill people and pets if they become trapped. All modern openers are equipped with “force settings” that make the door reverse if it encounters too much resistance while closing or opening. Any garage door opener sold in the United States after 1992 requires safety eyes—sensors that prevent the door from closing if obstructed. Force settings should cause a door to stop or reverse on encountering more than approximately 20 lbs (9.07 kg) of resistance. Safety eyes should be installed a maximum of six inches above the ground. Many garage door injuries, and nearly all garage door related property damage, can be avoided by following these precautions.

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If you have a steel door, but want the look of a wood one, it is not necessary to change your entire garage door. Often, it may be possible to mimic the look of wood with skillful painting. Your local home improvement store may be able to provide good advice about the type of paint and brushes needed to mimic the look of wood for your particular door material.
8.10 Double-check to make sure you have the correct wind on your new torsion spring. On the left side next to the winding cone the end of the spring wire should be pointing up if it is facing you. Notice, also, that the cone is red which usually designates right wind. Customers frequently call and explain that when they get about six turns on the springs they spin on the cones. This is due to installing the springs on the wrong sides of the center bracket.
Most residential garage doors have one of two types of springs: torsion or extension. Torsion springs are heavy-duty springs mounted to a metal rod that runs parallel to the door, directly above the door opening. These springs are loaded, or tensioned, with a twisting action. When the door closes, cables attached to the bottom corners of the door pull on pulleys attached to the ends of the metal rod the springs are mounted on. The pulleys turn the rod, which twists the springs and creates tension. When the door is opened, the springs unwind and help lift the door. https://www.youtube.com/attribution_link?a=Z_eZc-kh40c&u=watch?v=XXXXXX&feature=share

Insulation, which increases energy efficiency and can help to lower utility bills, is crucial when a garage door is attached to the home. In this case, doors with high R-values are preferred. This means it has insulation that can keep the heat in. The higher the R-value, the better insulated your garage will be against outside noise and cold and hot air.
Inspect the area around your garage door to see if something is blocking the photo eye sensors. Then look at the tracks to see if there is any buildup on the inside. You’ll need to get a step ladder to look at the tracks on the top part of your garage, as it will be difficult to see from ground level. It may also not be a bad idea to proactively wipe down your garage door tracks periodically to prevent this type of buildup from occurring. Running a damp rag along each track should be enough to remove anything that’s lingering on the tracks.
One thing to consider - assuming you have 2 springs and an opener, unless the other spring is quite new, you should replace it at the same time, first because it will probably break fairly soon anyway and changing two is only about $50 more than changing one, and because the springs on both sides should be of equal stiffness - if not, then the door will be unevenly weight compensated and try to open cockeyed, increasing wear and risk of damaging the motor.
Replacing torsion springs is done with the door closed. You start by carefully unloading all of the springs (most standard-size doors have two; any broken spring will already be unloaded), using the winding bars. Then, you unbolt the springs from the central rod bracket, disconnect the cables from the pulleys, and loosen the pulleys and slide them off of the rod. Next, you swap out the springs, reinstall the pulleys and cables, and secure the inside ends of the springs to the central bracket. Finally, you wind up both springs (securing them with two setscrew bolts on the winding cones) and test the door for proper spring tension. Often, springs need an extra quarter-turn or two to get the door balance just right.
Fiberglass and vinyl garage doors are composite units, combining a steel core behind a fiberglass or vinyl skin. They have also polyurethane insulated base sections, or other type of foam insulation. These premium doors can match steel garage doors, and be a realistic imitation of wood (namely fiberglass units), but they may be more expensive than steel units.
Both types of springs are loaded, or under tension, when the door is closed. This gives them stored energy to help lift the door as it's being opened. When the door is all the way up, the springs are relaxed, or relatively so—they still may be under some tension. The mechanical difference between extension and torsion springs is that extension springs are loaded by stretching, or elongating, while torsion springs are loaded by twisting, creating torque.
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With hundreds of moving parts that are all required to work together, it's no surprise that garage doors may need occasional repair and maintenance. Garage door repair services are also required in emergency situations, like when the garage door won't operate and the car is trapped inside or you've accidentally backed into the door when it was closed. Whether it's a specific repair of your garage door opener, a broken spring that needs to be replaced, or a bent or rusted track, The Home Depot's local, licensed service providers can get the job done quickly and efficiently.
Squealing, screeching, or grinding noises from your garage door are usually indicative of a lack of lubricant or an accumulation of dirt or debris in the tracks. When removing debris, do not use harsh chemicals to clean the tracks. Once the track is clean, coat it with lubricant designed especially for garage doors, if possible. If you do not have access to this special type of lubricant, you can use WD-40 on the tracks and hardware. http://www.youtube.com/v/Z_eZc-kh40c&feature=youtube_gdata

Most residential garage doors have one of two types of springs: torsion or extension. Torsion springs are heavy-duty springs mounted to a metal rod that runs parallel to the door, directly above the door opening. These springs are loaded, or tensioned, with a twisting action. When the door closes, cables attached to the bottom corners of the door pull on pulleys attached to the ends of the metal rod the springs are mounted on. The pulleys turn the rod, which twists the springs and creates tension. When the door is opened, the springs unwind and help lift the door. https://www.youtube.com/attribution_link?a=Z_eZc-kh40c&u=watch?v=XXXXXX&feature=share
The average cost is $190 for 2 springs in the Detroit area. This is for steel doors weighing under 140 lbs or known as a standard spring which fits 90% of all doors. The remaining 10% are wood doors or large heavy insulated doors. Expect to pay an additional $60 - $100 for a set of these. Garage Door Companies rarely carry these springs on their vehicles or stock them. Therefore, they either buy them locally at a premium or special order them. Regardless, its an additional trip that gets figured into the cost.
Single panel doors can also be installed with (one piece track type hardware) that folds the door back with a single horizontal track on each side (which is mounted at the top of the wood frame) and a roller, (mounted to the top of the door on each side. A hinge on each side that attaches to the bottom of each side of garage door. Using track hardware, a car can be parked much closer to the door, as the whole door, when in the open position, rests completely inside of the garage door header. Track type hardware has much less arc when raising and lowering the garage door as opposed jamb type hardware.[citation needed]
9.13 If you have a spring anchor bracket with a fixed steel bearing, check for wear at the point where the shaft and bearing race meet. The shaft needs to be free to slide sideways inside the bearing. File the shaft if needed. Lube the bearing. Notice that only one bearing is needed for two torsion springs. This bearing keeps the shaft from rubbing against the inside of the stationary cones and on the center bracket. Your garage door may not have a center bearing. If so grease the shaft where it will be rubbing the bracket and the insides of the cones. https://www.youtube.com/e/Z_eZc-kh40c?app=desktop
Nate was very courteous and professional and called to let me know that he was about 30 minutes from my house. I had purchased a new Sears garage door opener, but when Nate arrived at my home, he inspected the existing unit and told me that it was still in good shape except for a worn out part. Nate procured the new part and brought it to my home this morning. The unit was repaired in about 10 minutes! The existing unit was just over five years old, so I'm glad I will get some more use out of it.
2.3 Beware of older winding cones. These older Crawford and McKee torsion spring cones were made for 5/8" bars. Sometimes, however, the holes are too small for 5/8" bars. Whatever you do, don't use a 1/2" bar; instead, grind down a 5/8" bar to fit. I recently had a McKee spring let loose after winding because I used a 1/2" bar when my 5/8" bar wouldn't fit. Just before it let loose I was telling myself, "This is not safe." And it wasn't. The only safe way to replace these older springs is to make a winding bar for each hole of each cone.

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Even though most of us are likely used to seeing this small spring in place on our garage door, we don’t often think too much about it, and we simply count on it working when we need it to. Unfortunately, it doesn’t last forever and will eventually need to be replaced. It’s best to be proactive and notice when it begins to look worn down before it actually breaks. Otherwise, you may find yourself trying to open the garage door to drive to work one morning, only to find that the door won’t open because the spring is broken. 

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When you're done watching this video you'll know how to determine whether the company you hired to replace your garage door spring installed the right size spring on your door. You'll also learn the consequences to your garage door opener if the wrong size spring is used. If you are having a problem with your garage door spring, the 2:30 minutes you spend watching this video is time will spent.
The tricky parts of the job involve you carrying the tension of the spring. Replacing a spring requires that you first unwind the spring to relieve the tension, then wind it back up and secure it while it's under tension. Winding bars are used for all winding and unwinding actions—don't try to save a few bucks by substituting long screwdrivers or pieces of rebar for the real winding bars. Substitute tools are much more likely to slip, or they may bend or break under the load of the spring. https://youtube.com/watch?feature=player_embedded&v=Z_eZc-kh40c
Eric Jonas has been writing in small-business advertising and local community newsletters since 1998. Prior to his writing career, he became a licensed level II gas technician and continues to work in the field, also authoring educational newsletters for others in the business. Jonas is currently a graduate student with a Bachelor of Arts in English and rhetoric from McMaster University. https://youtube.com/v/Z_eZc-kh40c
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