Needle won't remain threaded

Be sure to install a brand new needle. Verify it is the correct needle for your machine and it is installed facing the correct direction.

Remove all the thread from your machine. (Clip the threads below the thread spools, RAISE the presser foot, and gently pull all the threads DOWN through the needle--NEVER up!)
ALWAYS RAISE the presser foot and rethread from the beginning. Verify that you are threading each thread in the order specified in the manual--failure to do so will cause your machine to malfunction.
When threading, give each thread an extra little tug when going through the tension disk.
Set all the tensions to the midway point for a 3 or 4 thread overlock.
Test your machine.

If the left needle still fails to stitch, then your machine may need a timing adjustment.

If you haven't already, install a brand new needle. Be sure to use good quality thread--no old stuff or bargain bin variety.

Remove all the thread from the machine.

Raise the needle until it is at the highest point it will reach before it begins to lower.

RAISE the presser foot and rethread from the beginning--verify the thread path is correct. Pull at least 5 inches of thread tail through the needle.

Check that the bobbin is installed correctly.

Set the upper tension to somewhere around the midway point between high & low number.

Pull the bobbin thread to the top of the fabric:
How and Why to Bring up the Bobbin Thread

When you begin to stitch, gently hold both thread tails with your left hand and begin stitching slowly to start.

Why does my thread keep pulling out of needle

Tilly and the Buttons Five Common Sewing Machine Mistakes How to Fix Them

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Yes.

try changing the needle--make sure the needle is the correct one
for the fabric being sewed.
also make sure the needle is turned the correct way in the needle
holder and pushed all the way up into the needle holder.

Skipped stitches
1. The needle is not inserted correctly
Remove needle & reinsert needle( flat side towards the back of machine)
2. The needle is damaged
replace with new needle
3. The wrong size needle is being used
Choose a needle to suit the thread & fabric
4. The foot not attached correctly
Check & attach correctly

bird nesting problems

Try these suggestions

1. Change needle

2. Rethread the machine--top --make sure to use every thread guide

3. Take the bobbin out --make sure it is inserted correctly into the bobbin

Case, & make sure the bobbin is turned the correct way

4. make sure the thread has not come off the thread take up lever

5. Clean under the needle plate & in the bobbin area for lint or threads



The needle thread breaks

1. the needle thread is not threaded properly

2. The needle thread tension is to tight

3. The needle is bent or blunt

4. The needle is incorrectly inserted

5. The needle thread & the bobbin thread are not set under the presser foot when starting to sew

6. the threads were not drawn to the rear after sewing

7. The thread is either to heavy or to fine for the needle

try changing the needle
rethread the machine top & bobbin
make sure the bobbin is wound correctly & inserted correctly
into the bobbin case
if these suggestions don't help then you might think about having
the machine checked at a sewing machine shop

try changing the needle
rethread the machine top & bobbin
check to see if the thread has come off the thread take up lever
clean under the needle plate & in the bobbin area for lint & thread

it's very possible that the machine is slightly out of time & needs to be service at a sewing machine shop
is the fabric & thread & needle compatable with each other?
did you use every thread guide when threading the machine?
is the bobbin in correctly?
is the bobbin warped?

that use to happen to me on my sewing machines, I would rethread the machine to make sure the thread is not caught on anything like the thread spool, or around anyone of the thread guides

also for both top & bottom threads, I keep a thread tail of 3 to 6 inches & before I start sewing I pull the thread behind the needle to the back of the machine & the I put the fabric under the foot & start sewing & now I don't have that problem anymore

Good day!

please try this simple tips:

Good day!

A sewing machine operator can often help themselves when their machine does not operate properly.
Here are some simple instructions, which if properly used can save time and mechanics service calls.
TROUBLE;UPPER THREAD KEEPS BREAKING;
This could be trouble;================Do this;
1.Top tension to tight================loosen tension 1 turn
2.Machine improperly threaded=========check threading
3.Thread twisted on guide post========"
4.Thread twisted out of tension======="
5.Take up spring bent or broken=======Check action of spring
6.Thread jumped off pull off finger===Check threading
7.Needle bent or burred===============new needle
8.Bad cone of thread==================try another cone
TROUBLE;LOWER THREAD KEEPS BREAKING;
1.Bobbin tensionspring to tight=======Loosen tension slightly
2.Bobbin threaded wrong===============check threading
3.Bobbin wound to tight or uneven=====try new bobbin
4.lint or thread on bobbin case=======clean inside case
5.Lint or thread inside hook==========clean inside hook
6.Bobbin case nicked bent or burred===check/change case
TROUBLE;MACHINE STARTED SKIPPING STITCHES;
1.Needle bent or burred===============change
2.Needle set in crooked===============Check
3.Thread jumped off take up spring====check threading
4.Thread jumped off pull off finger===check threading
TROUBLE STITCHES SHOWING LOOPS;
1.Forming loops on top of cloth=======Tighten bobbin tension
======================================or loosen top tension.
2.forming loops on bottom of cloth====Tighten top tension
3.Bobbin placed in case incorrectly===remove and replace
4.Bobbin thread slipped from under====check threading of
tension===============================bobbin case
5.Lint or thread in top tension=======clean between tension discs


Thank you and good luck.