Im looking for a bobbin and bobbin holder for my treadel singer sewing machine

no free bees online

its here half way down repair manual
Singer 611 631 Service Manual

paypal to buy a download
Singer Sewing Machine Repair Manuals

Sounds like your placement is off. Check your instrutions or look on line for the manual. I hope this is helpful, at least point you in the right direction.

Marjorie, the first thing you should do is download your user's manual. It is a free download at the Singer Sewing Machine website, and it's pictured on page 74.

I"m assuming that you are asking how to reinsert the bobbin case, rather than the bobbin itself. If you don't have your user's manual, you can download it free at the Singer website. When you do, look on page 19; it has exact directions and an illustration there regarding how to reinsert the bobbin case.

This will be difficult to explain but basically if you remove the plate covering the bobbin holder you will see the bobbin holder.It will have a small prong that should pass the eye of the needle and picks up the thread from the needle. If the timing is out then this pick up prong will be either too soon or will have gone past the eye. get on the web and type in sewing machine needle timing and you will get diagrams for most makes. I did that and fixed an old singer industrial machine.

sometimes when you break a needle it can cause the machine to
jump time, the machine would have to be taken to a sewing machine
shop to be checked by the technican

Check for correct bottom thread tension.
It's provided by a flat spring on the bobbin holder.
When the bobbin is correctly installed, pulling on the thread
should meet with slight resistance, and the bobbin should spin without
trying to jump out of the bobbin holder.

It sounds like the wrong size bobbin, try calling Singer is your bobbin is right because they should be able to answer why it is acting so strange. Good luck

If you lift up the thread holder, the bobbin holder is inside. Loosen the hand guide to stop the needle from going up and down. Pull the thread around the top thread guide and back into the bobbin holder. Thread the bobbin and move the bobbin over so the guage is "inside" the bobbin. As for the manual, the Singer Merritt 2404 is applicable to the 2430 if that helps.

I assume you checked to see there are no needle bits in the bobbin case holder.
Without looking at the machine it is difficult to diagnose the problem. It could be any one or a combination of problems, timing, needle bar height, damage to the hook and base etc.
I strongly suggest you have it looked at by a sewing machine tech.