Machine is running but sounds like a train. Little pieces of black plastic are falling from somewhere?

I would take it in for service, because it sounds to me like the machine has threads wrapped around on the inside somewhere. Generally, you can take off the face cover relatively easily and it's designed to come off to clean the thread path. It's a separate cover section right over the needle shaft, and it's held by one or two screws, depending on the model. If it's two screws, one is in the side and may be covered by a little white plastic piece that you pop out by pressing on one side with a flat blade screwdriver, and the screw is underneath. When you press it, other side comes up, and you then remove it.

You may have a timing problem or bent needle. You will need to replace the bobbin basket if it is damaged.

It sounds like the spool cap is broken or defective. It should fit snugly on the spool pin. If it is constantly falling off, then try finding a replacement. The horizontal spool pin design helps the machine pull the thread off the spool because the thread spool does not need to spin. The added pressure of spinning a thread spool contributes to tension issues (especially if you are using large thread spools that are so common now days).

On new machines, frequently the thread cutter is on the back of the presser foot lifter.

The thread guide above the needle is usually threaded from the left side because the thread tends to be pulled toward the right.

Unfortunately, what you are experiencing are pretty much common functions with most newer sewing machines, so even changing machines may not result in any greater degree of satisfaction.

then your feed dog button is either come loose or is broken, it needs to be
serviced

I've had good luck with www.sewingpartsonline.com and ordering from them, but if you really want to be sure you can always call Singer at 1-800-4singer and order right from them, Good luck and I feel sorry for you having that kind of trouble and hope you have the right part this time.

Sometimes when a bobbin is wound very fast the plastic gets hot and misshapen, and you can't remove it. Nothing for it but to break the bobbin - it's useless now anyway even if you could get it off in one piece. Pull off as much thread as you can and use pliers or something similar to break enough of the bobbin so it will come off. You need to take care not to let little broken pieces fall into the machine mechanism and take care not to yank too hard on the bobbin winder spindle. If all this scares you too much, take the machine to your dealer for help. And remember to slow the machine down a click or two when you wind bobbins! (It may be of some comfort to you to know that every user of plastic bobbins has done this at some time!)

That piece is a sweep that helps keep the hook clean. It is not necessary for the machine to use, I have thrown away many of them. If you can get your hook put back in you should be ready to go.
good luck!

Check your Instruction manual - if you have taken the bobbin case apart to clean it, the shuttle must be reinserted with the little tab pressing against the piece you mention. It is under page 45 - "Caring for your machine" in my book. I missed it the first time I cleaned and oild mine.

This is for front loading bobbin..........

The Shuttle hook will look very much like this, and marries this to the "half moon" of the fixed shuttle.


The retaining collar ring that holds it all together has a plate like protrusion (like bull horns), this faces to the top and to the back.......there should be a small lug (or two) with corresponding small hole or slot on the fixed housing (hook race) that locates the ring tightly in the correct position.

There should be 2 swivel arms (black plastic at 4 o'clock & 8 o'clock)) that move to hold the whole thing together by clipping onto a small lug on each side of the ring.

If you tip the machine 30 degrees on its back while you do all this, it makes the process easier, as things are less likely to fall out.........support the back with a soft object for convenience (tissue box, pillow etc)

The bobbin case goes in after the housing is assembled, if you try to do it first, it will prove more difficult.

If this is not quite accurate for your model a photo of the bits would be helpful