Question about Janome 4623 Mechanical Sewing Machine

1 Answer

No tension on upper thread.

I have a 7623LE Plus... Great machine. Have lost all tension on needle. Bottom tension is fine. How do you get to the tension to see what the problem is? i.e.remove the case etc. Thanks. naomi

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Janome Master
  • 1,388 Answers

If you are using a standard tension of 4 or 5 and this problem has developed over time, the most likely cause is lint deposited between the tension disks....... 
Raise the presser foot and with a length of scrap fabric, use an action like flossing your teeth to get between the disks......in extreme cases a probe (old needle) may be used very gently to remove thread and lint, but be VERY careful not to scratch the polished surfaces. 
I have also written a tutorial on tension balance which may be of further assistance: 

Please TRY the solution BEFORE giving your considered rating.

Ensure that all is clean and free of lint and jams, this is the most likely cause....now for tension troubleshooting .......

This solution is for tension problems...if you cannot form any sort of stitch, the issue is quite different, so please let me know if you need a different problem solved.....

It is quite long, but just work through each section in order.
The "knotting up" can reveal a lot. If you have loose threads on one side or the other, the tension on the opposite side will be the culprit.

QUICK SUMMARY FIRST:
Ensure sharp new needle, 
Thread guides and Bobbin are Clean & Clear of lint
Set Top Tesion to 4 ....then....
Balance Bobbin to suit.

TOP THREAD TENSION:
If the looping threads are on the underside as you sew, it is the top tension. Top tension ought to be between 4 & 6 (this variation to allow for the different weights of fabric in your 
projects). 

IS YOUR NEEDLE SHARP ?
If you are using a needle that has seen quite a deal of work, or you suspect it may be blunt, change it for a new one !

TOP TENSION & GUIDES:
Make sure that when you thread the machine the presser foot is up so the thread goes between the discs and not to one side, top tension between 4 and 6, and that you have threaded through all the guides, including the last one, usually on the needle arm, just above the needle clamp.

It may be there is lint trapped between the discs, this will keep them slightly apart and reduce the actual tension, sometimes dramatically.

If tensions appear correct, and the thread is definitely in the channel between the discs, but still too loose and looping, try raising presser foot and remove your thread.

Now, with a 2" (50mm) wide strip piece of fabric 8 - 10" (20 - 25cm) moistened with methylated or denatured spirit, gently insert the fabric strip and clean between the discs with 
a see saw / to and fro action.

In the worst cases, gentle use of a needle to pick & remove the jam may be necessary, but be very gentle and make sure the tension is set at Zero and the presser foot is raised, (to 
disengage tension plates).... do not gouge or score the plates, they need a polished surface to work correctly.

BOBBIN TENSION:
Far less common, but if the loose threads are on the top, it is bobbin tension that is loose, it too may have lint in the spring and be giving a "false" tension. 

I would not recommend fiddling with bobbin tension without good reason, it may end up with missing small screws and spring pieces, however, you can take the needle plate off to clean 
the hook race area (where bobbin case sits) 

...this is just good housekeeping, my wife does this every time she replaces the bobbin....

just take it out and clean the bobbin case and the fixed metal hook race with a small brush to remove lint. If there is a significant amount of lint, use a vacuum and small brush to get the worst.

Then wipe all this area with a cloth or cotton bud (Q tip) moistened (not soaked) with methylated spirit, especially if there appears to be fine dirty deposits....oil and lint combine to conspire against you.

If it seems likely that you ......really ....do .....actually .....need .....to adjust the bobbin case, first check there is no lint trapped in the metal spring where the thread is tensioned. 

TOP LOADER:
Drop-in Bobbin case will look similar to this image with the tension screw in the middle of the metalwork....

No tension on upper thread. - 4c76dc1.jpg ...the other screw at one end is holding it all together, so beware....it is not a tragedy to undo the whole lot and clean it, but very gingerly and lay the bits out in sequence and orientation, or you risk tearing your hair out !

FRONT LOADER:
....this is a bobbin case from a front loading machine and works in a very similar fashion to the top loader with drop in bobbin, again, if you dismantle it, take care so you can put it all 
back properly.
165ca5c.jpg FINISHING UP
GETTING THE BALANCE RIGHT:
When you are certain there's no trapped lint in top tension or bobbin, set the top tension to 4 and the bobbin tension to a point where you just begin to feel resistance.

Try using good quality thread of contrasting colours so you can more easily spot the changes.

Set your zigzag to one width less than maximum (eg. 5 of 6 ...or... 4 of 5 etc) and sew a sample for a few inches and check the result.... adjust the bobbin tension screw very little at 
a time, perhaps 1/16 of a turn.

You may find you are playing with this balance for some little while and if you are putting the needleplate on and off each time begin to think it cannot be correct to do this.....BUT....it is, 
and eventually, you do get a "feel" for the correct tension and then it happens quite quickly.....as a user you won't be doing it very often unless there is lint built up (or are there small hands at work around the house !?!?!)

OTHER ISSUES:
If you live near the ocean as we do, salt air can play havoc with metalwork inside and out, so to help minimise this, keep a few small packets of dessicant (silica gel) in your machine 
case....no case ? then make some sort of cover ! 

Same applies in any damp or humid environment, keep your machine dry and dust free.

Budget for a proper full service every couple of years (more often if heavily used) and if you don't use your machine for a few years, be aware that old oil will dry out and combining with 
dust and form a "clag" like glue (another reason for some sort of cover, even a teatowel !)

FINALLY, A WORD ON THREAD:
If it is worth spending the time, energy and money on making something that you would like to give lasting enjoyment......use quality thread, .......it may seem to cost a little more at the 
time, but the results, ease of use and added longevity will be worth the extra, and as a bonus, your tension troubles may be fewer and further between, because there is a more consistent diameter with good thread, and less compensating to be done by your tension plates and less thread breaks !
 
 

www.bargainbox.com.au

Posted on Nov 23, 2008

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

How do you adjust the bobbin tension?


Factory standard tension for upper thread is the midway point between the high and low number. However, that tension dial is meant to be used for tweaking tension. Generally, tweaking is required whenever the type of fabric, needle, or thread are changed, ie thicker fabric like denim should have a different upper tension setting than fine chiffon. To be successful with tension settings, one must become comfortable adjusting the upper tension.

NOTE: Accurate tension is achieved when the upper thread and bobbin thread meet in the middle of the fabric.
.
Understanding Bobbin Tension


...

Jan 20, 2016 | Brother Sewing Machine - XL2600i

2 Answers

Model 525B. Why is bottom stitch loopy and the hand wheel and needle jam?


try a new needle

try adjusting the top thread tension to see if that helps the bottom loopy stitch

Jan 10, 2016 | Janome Sewing Machines

2 Answers

It is bunching up underneath the presser plate


this normally indicates that the needle thread tension is incorrect (too loose)

Jul 30, 2015 | Sewing Machines

1 Answer

Singer 2112


first ,re thread the upper bobbin, check the needle to match the fabric and the lower bobbin thread should be the same like the upper thread. If it dose not work, clean the discs tension for the upper thread.

Aug 15, 2014 | Singer Sewing Machines

1 Answer

Sewing machine jams when I use thicker threads


Thread sounds too heavy for this machine, or at least these needles. Thread should occupy about 40% of the side to side width of the needle's eye. See: http://www.gwsms.com/didyouknow.htm

Mar 24, 2014 | Brother CS-6000

1 Answer

Hi, I'm trying to sew a silky fabric and the stitches on the bottom keep getting jumbled and the top thread breaks


My guess is that you have lost all of your upper tension and you may have your needle in backward.
Unthread the machine.
Raise the presser foot. Turn the handwheel until the take-up lever is at it's highest position. Set the upper tension dial/knob to 5. Remove the needle and replace it making sure that the flat side of the needle shank is to the back. Thread the machine.
With the presser foot up, the upper thread should pull through easily and then grab when the presser foot is lowered.
Test sew.
The upper tension pulls the stitches up and the lower tension pulls the stitches down. When they pull properly, the stitch is even.

Oct 29, 2010 | Husqvarna Huskystar 215 Sewing Machine

1 Answer

Under side of fabric.... the thread is a mess


Remove the thread from the upper portion of the machine.

Place the presser foot in the up position.

Turn the handwheel so that the take-up lever is in the highest position.

Ensure that the upper tension dial/knob is set to 5.

Thread the machine all the way and through the needle.

With the presser foot still up, hold the thread from behind the needle and pull about a foot of thread through. It should pull through with very little resistance.

Now lower the presser foot, pull the thread and you should feel great resistance.

If so, now try to sew.

If not, there is a problem with the upper tensioner.

Jul 20, 2009 | Singer 3116 Simple

1 Answer

Bobbin


To adjust any sewing machine for thin material do the following.

1.Use a fine needle,
2.Use a fine thread,(upper & Lower)
3.Reduce the the thread tension, Upper& Lower)
4.Reduce the presser foot tension,
5.Reduce the stitch Lenght.
6.Help the machine by pushing the material towards the needle while sewing. (don't pull it back.)

Apr 04, 2008 | Singer 7462 Mechanical Sewing Machine

1 Answer

Thread on bottom, bobbin thread loose


Sounds as though you've misthreaded the upper tension. The best way to verify this would be to thread your machine, lower the presser foot on to the material. Now try pulling the thread through the needle. (Assuming your upper tension dial is set to a number greater than one). You should feel resistance. Should you not feel resistance, rethread your upper tension.

Feb 01, 2008 | Singer 6038 Mechanical Sewing Machine

Not finding what you are looking for?
Janome 4623 Mechanical Sewing Machine Logo

192 people viewed this question

Ask a Question

Usually answered in minutes!

Top Janome Sewing Machines Experts

Bargain Box
Bargain Box

Level 3 Expert

1388 Answers

Douglas Plant
Douglas Plant

Level 2 Expert

165 Answers

Irene Tulloch

Level 2 Expert

449 Answers

Are you a Janome Sewing Machine Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...