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Lervia kh4000 sewing machine everything was working great until I

I have a lervia kh4000 everything was working great until I changed the lower thread colour on the bobbin, prior to this I broke a needle so had to undo the bobbin casing by undoing the two black plates either side of the outer circle which hold the actual casing inside... now even after putting it together I cannot get the top thread to automatically thread the lower thread even by doing it manually it doesnt stitch the lower thread .., have googled for images where the actual casing is supposed to sit in the machine but no luck :(

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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  • 152 Answers

SOURCE: how to set the thread tension on a lervia KH4000

There is a switch that is activated when you put the foot up or down that lets the machine know if it is o.k. to sew or not. The spring to that switch is most likely broken and now even though the foot is down, the machine "thinks" it's up and won't let you sew. A trip to your service tech is needed.

Posted on Oct 12, 2009

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bargainbox
  • 1388 Answers

SOURCE: Machine not sewing

Make sure you have threaded the machine from right to left, it sounds like the needle thread is trapped under the lower looper thread and cannot form a stitch.........start the threading over from scratch like this:

  1. Lower Looper
  2. Upper Looper
  3. Left Needle
  4. Right Needle
Is there a diagram for how to thread on the inside of the door ?

Follow that slowly and carefully to make sure you have not missed any thread guides on the way, as each one needs to be followed through to ensure correct tension and thread progression.

If you are certain that all threaded correctly, did you have a fabric jam and pulled it loose ? If so, the timing may well be affected.

Post an update and we'll get this right.

Bargain Box

Posted on Feb 03, 2008

SOURCE: Bernina 1130 not catching bobbin thread

there will be a adjustment in that you should select the stiching mode and in that give the straight mode the problem will be solved

Posted on Jun 05, 2008

  • 1 Answer

SOURCE: while sewing the bobbin case moves, wheel locks up, needle locks

Im not sure if this will help but thought I would pass it along. My Pfaff 6122 tells me to check bobbin for thread unrolling clockwise before you place it back in the machine. I had mine turned to un roll counter clockwise, this is wrong, the bobbin will fall out when you pull on the thread while you are holding it in your hand. You may just keep putting it in backwards. Hope this works for you. J.R.

Posted on Feb 05, 2009

  • 3 Answers

SOURCE: Not picking up the Bobbin thread

Sounds like you have to take off the throat plate and clean out threads under it.  Sometime they ball up and prevent the needle from going down and catching the bobbin thread. You can't see themuntil you take off the plate.  Follow the directions.  It is easy.

Posted on Mar 07, 2009

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I was attempting to pick up the bobbing thread, before sewing. The needle is now stuck in the down position and the handwheel is unresponsive but the motor is whirring when foot pedal is depressed.


Do not press the foot pedal. Continuing to run the motor when the machine cannot work properly could irreparably damage the motor. Unplug your machine. Cut the top thread at the needle, open the bobbin area and try to remove the bobbin case. You may have to patiently snip tangled threads, but eventually you should be able to get the bobbin case out. Once that happens, the needle will most likely be free.

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Hi I have a Lervia KH4000 sewing machine that i have been given with no instruction manual, I have used electric sewing machines before but on this one there is no obvious place to load the bobbin, do you...


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How to set the thread tension on a lervia KH4000


There is a switch that is activated when you put the foot up or down that lets the machine know if it is o.k. to sew or not. The spring to that switch is most likely broken and now even though the foot is down, the machine "thinks" it's up and won't let you sew. A trip to your service tech is needed.

Oct 11, 2009 | Sewing Machines

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