Question about Sewing Machines
My machine recently started making a really loud thumping sound when sewing and also the presser foot jerks up and down. I cleaned the bobbin case, switched the bobbin, changed the needle, and re-threaded the machine and no better. Help!
Hmmm... Can you determine where the thumping is coming from?
In my experience thumping like this is because something has gotten out of time. You might be able to see it if you take the bobbin, and needle plates off. Take off the threads, top and bottom and you might have to take out the bobbin carrier too. Making sure to understand how it goes back in. Take off the presser foot and any presser foot holder. Locate the shuttle point. Hand rotate the machine in the direction it normally turns (NEVER backwards) and watch what the needle does. Does the needle hit the shuttle? Does the shuttle bounce up and down?
You also might try grasping the presser foot bar and the lever at the same time. Check for play of the bar by gently moving the presser foot bar up and down while "feeling" for unusual movement.
Even if you determine the issue... you'll need to take it in for repair. There are no publicly available service manuals for your machine (or my brother for that matter)
You also might want to check your bobbin for rough spots, use very fine sand paper to smooth them out if you find any.
Posted on Nov 06, 2012
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Posted on Jan 02, 2017
SOURCE: I have a Brother CS-770.
Hi. It's very likely that the needle is inserted wrong. Take the needle out and make sure that the flat shank of the needle is facing away from you (to the rear of the machine).
Try this and let me know if it helps, ok?
Posted on Aug 13, 2010
Have you taken your throat plate off and cleaned that out? You have to take a stubby short screwdriver and remove the throat plate. Sometimes, lint and cloth build up in there and it looks like felt almost. I was surprised when mine had it, I always followed the standard way of cleaning and lubricating until my friend told me about this. I was shocked, to say the least, that she was right. And my machine quieted right down. Hope this solves your problem
Posted on Dec 30, 2010
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