Necchi needle bar screw

The is usually an adjustment to tighten the belts by moving the motor. There are other ideas here, clutch, the knob in the handwheel or the screw in the needle bar..

https://www.google.com/search?q=Have+a+Necchi+534FB.+The+hand+wheel+does+not+turn+the+needle+bar%2C+belts+are+loose

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Generally speaking; You should have two setting bars on your machine, one for the stitch size and one for cotton tension (might be close to needle part, above)...you will see it has numbers you can set it to the level you want. I hope you find this useful.

Hi Jay.
try this google link out.
https://www.google.com/search?q=Necchi+513+needle+will+not+engage.&rlz=1C1AVFC_enGB797GB798&oq=Necchi+513+needle+will+not+engage.&aqs=chrome..69i57.3739j0j9&sourceid=chrome&ie=UTF-8

talk with any sewing machine repair shop as the screw will be generic

Maybe this manual should help you
http://freenecchisewingmachinefiles.weebly.com/uploads/1/8/7/3/18731174/necchi_service_manual_bu-bf_nova-mira.pdf

Hi there, don't know your machine but you can do a plaiin buttonhole manually.
Set machine up for zigzag stitch, needle to left side, mark out the size you need with pins or marker pen. Start at the top and set for widest zigzag with 0 length for the top bar, cannot give sizes as don't know the button you are using, about 6 stitches, set stitch width to just over half the width of top bar and length to approx 0.5. Stitch down to bottom marker and again set up ffor the wide bar, do the same amount of stitches as the top, finish with needle down at the outside edge, turn work so that you will now stitch down the other side to meet the top bar, not forgetting to adjust stitch length and width again.
Hope this helps
Ellie

- check ifu are using same needle model.
- check hight of needle bar is ok
- check timming between needle bar and hook.
- check if your material is very stritch or no
- check blad point of hook is ok or no
best regards

there should be an allen screw on the back side of the needle bar clamp push it up and on and make sure its as stright as you can get it and tighten down on the allen screw

Try ebay for a parted out machine.