Why Does My Juki Sewing Machine Keeps Jamming?

If you’re a sewer, you know the importance of a good sewing machine. A sewing machine that frequently jams can be frustrating and even cause you to second-guess your sewing skills.

Before you start to panic, there are a few reasons why your Juki sewing machine might be jamming. With a little troubleshooting, you can get your machine running smoothly again in no time.

Why Does My Juki Sewing Machine Keeps Jamming?

There are many reasons why your Juki sewing machine could be jamming. It could be because of a poorly oiled sewing machine or because of incorrect threading. We’ll be explaining all the common reasons why your Juki sewing machine keeps jamming

1. Incorrect Threading 

 The most common reason for your sewing machine to jam is incorrect threading. This can cause tension issues and skipped stitches.

2. Poorly Fitting Bobbin

A poorly fixed bobbin can make your sewing machine jam. Before you use your sewing machine.

Make sure you properly fit the bobbin case properly. Fixing it poorly can cause your sewing machine to jam as well as tension issues.

3. Dirty Needles

It’s normal for needles to accumulate dirt in form of lint, thread, and dried oil over time. It’s important to prevent your machine from jamming by changing your sewing needles after every project regardless of whether it’s broken or not.

Also, if you can’t afford to change your needle frequently, you can clean them after using them to avoid errors.

4. Thread Tension Issues

Your sewing machine tension settings can also be a reason why your sewing machine keeps jamming. If the thread tension settings are too low, it can cause the thread to bunch up and jam the machine. On the other hand, if the tension settings are set too high, it can make the thread snap and break.

Ultimately, set your thread tension settings to the right setting to avoid machine jam.

5. Poorly Oiled Sewing Machine 

A machine that lacks adequate oiling will definitely jam amongst other problems. Make sure you oil your sewing machine regularly. You can check the manufacturer’s instructions on how often you should oil the machine.

6. Incorrectly Installed Presser Foot

The job of the presser foot is to hold the fabric in place when you’re sewing. If it’s not installed correctly, it can cause the fabric you’re sewing to shift and jam.

7. Dirty Sewing Machine

A sewing machine that is used regularly will accumulate threads, fabrics, lint, and dried oil. All these specks of dirt can overtime accumulate and cause the sewing machine to jam. 

Make sure you clean your sewing machine frequently to avoid jamming 

8. Sewing On Thick Fabric

Every sewing machine has a thickness limit it can handle. If the fabric you’re sewing is too thick, it might not fit under the presser foot which might cause it to jam. Ensure the fabric you are sewing has a thin layer to prevent machine jam.

9. Thread Quality 

The quality of the thread you’re using on a machine is also a factor that can cause your sewing machine to jam.

If you’re using a thread of low quality, there’s a strong possibility that it will; cause your machine to jam.

10. Settings Issues

Your sewing machine settings can also cause it to jam. Check the manufacturer’s manual to know how to put the machine in the right settings. 

Why Does My Juki Sewing Machine Thread Keep Breaking?

Thread breaks in a Juki sewing machine can occur for a variety of reasons, but most commonly they are the result of fabric being caught between the spool and the bobbin. Your machine may also break the thread if it becomes overloaded or if the wrong type of thread is used.

Thread breaking can be very frustrating and time-consuming. But there are certain factors that cause your thread to break. Here are some of the common causes of thread breaking:

1. Using Dull Or Inappropriately Sized Needles

Every sewing machine has its own needle size and type. If you use the incorrect needles or needles that are not designed for the machine. The thread can continue to break.

2. Threading Improperly

If the thread is not properly inserted into the needle or the machine, it will break.

3. Using Bad Or Old Threads

Threads, like needles, have qualities, and not all threads can be used on all sewing machines. Furthermore, threads lose their composition over time. When you use old threads on a sewing machine, they are more likely to break.

4. The Tension Is Too Tight

If your machine’s tension is too tight, it can cause the thread to break while you’re sewing.

Why Is My Juki Sewing Machine Making Holes But Not Sewing?

Sewing fabrics together is the main purpose of any sewing machine. However, there are situations where your sewing machine will be making holes but not sewing fabrics. This problem can be caused by a lot of factors.

Here are some of the most common reasons why your sewing machine makes holes but does not sew:

1. Thread Breaks

 If your thread breaks while you’re sewing, your machine won’t be able to finish the stitches it’s now attempting. Your sewing machine will just keep making holes which might ruin the fabric.

2. The Thread Isn’t Inserted Correctly

If the thread is not inserted properly into the machine, it can cause the machine to make holes without sewing the fabric. Ensure that the thread is inserted into the needle properly.

3. Your Bobbin Has A Problem

To complete a stitch on your sewing machine, top and bottom threading must both be active. The same quality problems that affect your top thread can also affect your bottom threading. 

If your bottom threading is not installed properly, your sewing machine will not sew the fabric.

4. Tension Issue

If your tension is too high, your thread may snap under the pressure. This will cause your machine to stop sewing. Alternatively, if the tension is too low, the thread may become tangled and cause the machine to jam.

Why Does My Sewing Machine Run Slowly?

There are different reasons why your sewing machine runs slowly, especially if it’s an automatic sewing machine. It could be poorly lubricated or the settings. Also, it could be mechanical faults, electrical faults, or rusty parts. 

Here are possible reasons why your sewing machine might be running slowly 

1. Dirt

As time goes on, fabric particles and dust can build up in your machine, especially if you don’t clean it regularly. If this happens, these particles are likely to clog your machine and slow it down.

2. Lubrication and oil

Sewing machines have a lot of intricate metal parts that need to be well-lubricated to function properly. If these parts are not kept lubricated, the machine will run slowly and inefficiently due to the metal parts rubbing against each other.

3. Jamming

This is another reason why your machine might run too slowly. A thread might get jammed in the bobbin, or bobbin case and it might make the machine run slowly.

4. Motor

If your sewing machine’s motor is malfunctioning, it may also run slowly. The simplest way to ensure that it functions properly is to check the pedal that regulates the motor.

The amount of pedal pressure you use will affect the speed of your sewing machine. Make sure to depress the pedal fully to achieve your desired speed.

5. Switch

Most machines come with a switch that regulates how fast the machine runs. If your machine is running slowly, check the switch before concluding that there is an internal problem.

6. Tension 

If your machine is running slowly, you may need to increase your thread tension. Alternatively, if your machine is not running slow, you may want to check your thread tension settings and reduce the tension to low.


There are lots of reasons why your sewing machine keeps jamming, it could be a result of dirt, low-quality thread, or improper installation. We’ve highlighted different reasons why your Juki sewing machine keeps jamming and also possible ways to fix the issue.

We’ve also provided solutions to different problems that might arise with a Juki sewing machine. Following the instructions left in this article, you should be able to fix jamming issues and other problems associated with your sewing machine.