SOURCE: bobbin case on my 524fb necchi has come apart
Almost all Necchi use a class 15 bobbin & bobbin case, a new case should cost around 7 to 10 dollars!
Dwayne
SOURCE: I have a Necchi 537L it was sold as a comercial
This is not a commercial machine and will give you trouble trying to sew upholstery,especially if you use heavy upholstery thread. You will get loops on the bottom.
It will sew only short stitches,No matter how long the stitch length is, because it only feeds the fabric from the bottom and it will stick.
It should sew regular fabric with normal threads with no problems. There is a pressure adjustment on the top of this machine which may be where your problem is located.Look in your book for instructions.Also, make sure the feed dogs are in the highest position. I don't know how long you've had the machine but if it has been awhile,remove the needle plate and clean the lint out from between the feed dog teeth.
sewman7
SOURCE: how to thread necchi 537L sewing machine
From the reel pin take the thread to the left and over the top thread guide above the takeup lever, make sure the takeup lever is up and and make sure the presser foot is up, take the thread straight down and round the right hand side of the tension unit and back up the left hand side to the takeup lever, thread the takeup lever right to left and take the thread down any guides to the needle, if the bobbin case goes in the front thread the needle front to back, if the bobbin case goes in the side thread the needle left to right.
SOURCE: NECCHI, model 4795. Thread bunches up at bobbin.
it sounds like the thred tenshion is to loos or the timing has sliped a little and its off a bit this can also happen with wear on the gears or just a loos fixing letting the timing slip back a bit,
SOURCE: Threading a necchi 537l
There are several Necchi models (and loads more) threading guides shown here, it may well be you can find one very similar to help.
Threading Guides
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