Updated at: 20-04-2022 - By: cnbusinessnews

Dirt and oil can cause problems for even Singer sewing machines. No sewing machine, no matter how advanced, is impervious to everyday wear-and-tear or an increase in filth levels. The 401A can be maintained with a little elbow grease, a checklist, and some time.

The 401A sewing machine comes with a few essentials that you should always have on hand. Prior to calling a repairman, you should have a maintenance/cleaning program, an oiling schedule, and a list of probable difficulty places.

Learn more about sewing machine repair and maintenance by reading the rest of this article. You’ll learn about the most common issues and how to fix them, so you can keep your system running at its best.

Singer 401A Not Working



You need a checklist because of this. If you can avoid the embarrassment of going to a repairman because you forgot to plug the machine in, you’ll be in a better position.

Your sewing machine’s bobbin winder may not have been put back into its sewing position after you’ve completed your project. A checklist will help you find these and other simple solutions. It’s possible that you threaded the machine incorrectly or failed to turn it on before pressing the foot control.

It’s also possible that you failed to oil the machine, causing it to malfunction in critical areas. If any of these problems occur, the machine will not start at all.

It is possible that the machine will not sew if the thread does not pass through the needle’s eye properly. As a further step, you’ll be able to verify things like the needle’s location, the foot pedal’s wiring, and more.

How to Fix a Singer 401A

When it was new, this was the only one of its kind with all metal parts. It is critical that you purchase the appropriate replacement components for this particular sewing machine type if you are to successfully repair it.

While using non-Singer lubricants can free the tension knob if it’s stuck, be careful. Due of the variances in chemical compositions, they can cause a sewing machine to malfunction.

In many cases, all that is required is a thorough cleaning and lubrication to get the machine functioning again. The majority of repairs are simple unless a component is defective. You don’t have to worry about voiding the guarantee because the machine is over 70 years old. If the 401A isn’t working properly, then examine the needle to make sure it’s not broken or deformed, and then inspect the bobbin area.

Singer 401A Not Turning On

The problem could be an electrical one. Check the power switch to make sure it’s on, and then check the power cord to make sure it’s connected. In the absence of power, you’ve located the root of the problem.

Attempt to re-energize the machine by plugging in the power wire and the foot pedal again. It’s possible that a wire is frayed and about to short out on you due to a loose connection.

You should inspect the knee lever’s wiring if it’s there on your model. Once the wiring is complete and everything is working as it should, look to see if anything is stuck. The machine may be unable to function as a result of this problem.

The motor may have a malfunction, and given its age of 70 years, it may be too weak to keep working. In the near future, there will be a replacement. It’s a simple fix, but you should still hire a professional to do it for you. Upon completion, they will ensure that the machine is fully operational.

Singer 401A Stitch Selector Stuck



You should start by checking the camstack for dry grease that has solidified. This is a popular source of information in these kinds of situations. This can cause the oil to dry out on you or become more solid, making it difficult to turn the lever.

WD-40 or other solvents won’t work on all grease problems. Rubing alcohol may be required to complete the task. To remove the solidified grease, a tiny flat head screwdriver may be required.

Make sure you set aside enough time to do this task, since it will take some time. An occasional hairdryer blast of heat may also be in order. When the heat is applied, the grease will come loose.

Even if you perform the following maintenance, you may need to find a new part if the old one is still not working properly.

Singer 401A Tension Problems

The bobbin will be the first place to check. Make sure that not only has it been inserted correctly, but that it is the correct one. If all of everything is in order, the next typical cause of contamination is dirt, grime, and lubricant. Ensure that the lubrication and maintenance of the equipment is up to date and clean.

Look at your thread after you’ve dealt with those issues. Tension issues may arise if you are using the improper type of thread, such as quilting or embroidery thread. In terms of the bobbin, plastic ones should be avoided in the 401A. They take too much damage.

It’s also possible to solve your tension issues by oiling the bobbin case’s edge. As it turns out, one person’s tension issues were alleviated when she replaced her worn-out metal bobbin with an inexpensive plastic one. It’s possible that a metal one should be used instead of a plastic one because it will endure longer.

If you’re using metal bobbins in the 401A, make sure they’re of the best quality possible.

Singer 401A Thread Keeps Breaking

The first thing to check is whether or not the thread was properly threaded. Many re-threads of the machine may be required in order to pinpoint the source of the issue. It’s possible the problem isn’t with the threading at all.

It is possible that the highest tension is adjusted incorrectly and is too tight for both the machine and the material. Another possibility is that anything is impeding the thread’s normal progress.

Make sure your thread route and tension dial aren’t to blame for the thread breaking. Also, make sure you’re using the right kind of thread. Rayon is a flimsy choice that is prone to breaking. If this is the case, switch threads.

The bobbin, needle, and any sharp burrs in the way of the thread should also be checked. You may have to get your hands dirty and use your fingertips to feel the thread path to detect the burrs.

How do You Adjust the Tension On a Singer 401A?



The 401A’s thread tension dial should do the trick. The only thing you have to do is turn the knob to the desired tension level by adjusting the number.

Getting a little screwdriver and opening up the bobbin box is the only way to adjust the bobbin’s tension.. When you want to tighten, turn the screw clockwise, and when you want to loosen, turn the screw counterclockwise.

It may take some experience to obtain the appropriate tension, so start with a scrap of fabric. There is no risk of damaging the quality fabric you are dealing with this method. You should be able to get the machine to sew as you want it to if you get the tension perfect.

This includes using the correct thread, as well. It’s possible that even with the correct tension, the wrong thread will snap. The wrong thread’s strength isn’t always as strong as you would think.

Singer 401A Needle Position

The 401A’s ability to sew is greatly enhanced by this feature. The thread and fabric to be sewn dictate which needle should be used. If the thread is to be able to pass through, the eye must be large enough and the tip must be powerful enough.

In order to accurately insert the needle, the flat side must face the back of the machine and the long groove must face the user. Of course, Singer recommends that you use a needle designed by the company to get the greatest results.

Make careful to lift the needle bar to its highest position before inserting the needle. Needles that are crooked or broken should not be used. If you’re not paying attention, they can get away from you.

Many common sewing machine issues can be avoided by inspecting your needles for bent or broken ones. As a bonus, having a dull needle in your sewing machine isn’t a smart idea. Every so often, swap out and sharpen the needle to ensure that you’re always utilizing the best needle.

Singer 401A Serial Number Location

You may have difficulty getting the serial number of your 401A from Singer. The serial numbers they issued for a specific letter combination will be provided if you are unable to locate it. The serial number for your machine may be difficult to locate in that response.

On the other hand, you may have to elevate the machine in order to locate the needle plate on your model. NA, NB, NC, and 401As received serial numbers with those letters, while subsequent Singer models received the same letters.

All serial numbers for a given set of letters will be made public by the Singer corporation, as well. It’s possible to get a list of all 1,000,000 serial numbers dating back to 1951 if the NA series debuted in 1951 and produced that many during the next seven years.

There may have been fewer than 100,000 machines built by the company per year in the 1950s, and so on. See the issue here? The serial number may be easy to locate, but dating your equipment is a bit more difficult.

Downloading a Singer 401A Instruction Manual



A manual for a Singer 401A is far easier to come by than figuring out when your machine was manufactured. You can acquire a copy to download from a variety of reputable places.

It wasn’t a bad experience this time around. Here, you’ll find a selection of similar products. This is the first time we’ve encountered it, so we’re not sure how it works. In addition to those two options, you can also test out Singer. This link will take you to their user manual online page, which is easy to find.

Then you may want to check out this place. No matter what type of Singer sewing machine you own, you should be able to find a handbook for it at no charge on our site. There are at least 15 pages of manuals in this book.

A decent internet search should yield more results if none of those sites work for you. To avoid paying in British Pounds for some of the sites listed above, take your time and do your research.

Singer 401A Motor

This model sewing machine used a Singer sewing motor based on the photograph we looked at. It is a shaft-driven motor that is inserted into the bottom of your machine and remains there until you need to remove it for cleaning.

Using a Q tip and a little elbow grease, you can keep this motor in good working order by cleaning the brushes. Not to mention the fact that, under ideal conditions, this motor appears to be a workhorse.

Also, you should be able to find replacement motors and parts at eBay. Just keep checking if you do not see any for sale the first time. Parts are not hard to come by and sometimes the Singer website has parts for sale to make it even easier for you to find a replacement if it does burn out on you.

What Size Bobbin for Singer 401A

EBay may also have replacement motors and other parts for sale. Do not give up if there are no listings the first time you try. Getting replacement parts isn’t difficult; in fact, the Singer website occasionally lists spares for sale to further simplify your search.

One store sells them for $4.99 for five or a dollar each, making them an affordable option. Cheaper options may be available in different locations.

Make sure that you get your hands on some Class-66 Metal Bobbins. They appear to be an endangered species. However, Singer does sell bobbins in different pack sizes and for a lower price than the one we provided. They can be found here.

See if metal bobbins for your 401A are available at a repair shop or other company that specializes in sewing machine supplies.

How to Oil a Singer 401A



Performing this task isn’t difficult at all. As a result, Singer has modified its oil formula in 70 years. Lubrication of your 401A may necessitate the use of an older formula.

Although Singer recommends exclusively using Singer oil for this task, you may be able to find a comparable brand for less money. The 401A has so many oil points that describing them all would be impossible.

Some Final Words

The 401A has been around for a while now. Its ability to stitch decades after it was manufactured shows that it is worth its weight in gold. If you’re looking for information on how to fix different Singer sewing machines, we recommend checking out our page on the subject. To access this page, simply click on Troubleshooting a Singer Sewing Machine.

Repairing a Singer sewing machine is a piece of cake thanks to the simplicity of the machine. For more complex repairs, we recommend that you hire a professional to do the work for you.