I have the Necchi # 537 running now ,it was like you said I cleaned the old dry oil out ,however I do not have a book with it to tell me where to oil it ,can you help me ,Thanks

Manual in Italian (Google translate helps):
https://manuall.it/necchi-519-macchina-per-cucire/

After the machine has been wiped clean with a rag, apply a drop of good oil to every movable part; to the bearings of the lower shaft (to which the shuttle carrier is attached) and to all other shaft bearings of the machine. The various oil holes in the machine indicate where the oil must be applied.
Sewing machine oil is a white mineral oil, meaning it is clear and has no smell. The oil has a light viscosity and will not collect on the machine's gears.

It's an old metal mechanical machine, right? It is probably seizing due to old oil that has dried. Here's my method for "unfreezing" old sewing machines. (You won't believe how good it sounds and how nicely it runs after you've give it some TLC!)


Wheel on right side that controls the needle up and down is very tight...

You can purchase a copy of the Necchi 537L manual as either a PDF download or a printed manual here: https://www.sewingpartsonline.com/instruction-manual-necchi-537-l.aspx? . There are several online guides for threading Necchi machines. These may help. However I don't know how different the leather and lace 537 is from other Necchi machines. The manual will have the threading diagrams.

I hope this helps .

Cindy Wells

A mechanical machine? How long since it's been thoroughly cleaned and oiled? Sounds like the machine is seizing due to old oil that has dried.

Wheel on right side that controls the needle up and down is very tight...

..

It's an older mechanical machine that has not been used for a long time and probably has not been cleaned or oiled. It is seizing from old dry oil. Avoid using the machine until it has been oiled or the motor could be damaged.

Wheel on right side that controls the needle up and down is very tight...

Necchi 537-L Sandi, Machine made in Taiwan, My guess on age would be early 80's. Links below may help, first link one lady states buy her 537L from sears in 1982., other links are instruction and info.
Check the attached links,instruction and guides, Good luck
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."

Life With Lou Necchi 537L Sewing Machine

Necchi 536 FB 537 FA Sewing Machine Threading Diagram

http://www.sewingpartsonline.com/necchi-sewing-machine-instruction-manuals.aspx

Ore eBay; see link below.
Some machine are real hard to find, and there are at lease 4 spoof sites that will be glad to take your credit card.
NECCHI Model 537 Sewing Maching INSTRUCTION MANUAL

You can purchase a copy of your manual here: Necchi 537 Instruction Manual

necchi's are good sewing machines, I personally own 2 necchi's,
and I've never had any problems with them and I've had them for around 10 years, here is what I suggest
use a new needle--one that is for the fabric your sewing
rethread the machine top and bobbin--use every thread guide
try a different bobbin
clean under the needle plate and in the bobbin area for lint
call a sewing machine repair shop in your area and ask them how
much a necchi sewing machine is worth or check on ebay and see
what they are selling for.
since you inherited the sewing machine,, having the machine
serviced completely would be a good idea, that way they can check
to see if the grease and oil that the gears and parts use is fresh or
needs to be replaced and it's very important the grease and oil are in
good condition.
and they can make sure the machine's is timed correctly
ask how much a tune up cost for a sewing machine and then
you'll have to decide if the price is what you want to pay.

also since the sewing machine is doing repeat loops from the bobbin
adjust the top thread tension just a little at a time till the stitch looks
normal on a scrap piece of fabric
if you don't have a manual on the sewing machine let me know & I'll try
to find you one.
I've been sewing for 30 years, and like I said I have 2 necchi's already
and I had one other one before these 2 that I have now and it lasted me
for around 15 years and I wore it out making clothes.
I wouldn't hesitate to buy or except another necchi because I know
they are good machines.
I have a mechanical and a electronic necchi and my husband uses the
electronic one when he makes quilts.
good luck on your decision
Merry Christmas and A Happy New Year

I have the same machine and have had a similar problem. My belt was just old though. You need a new belt. And once installed it must be adjusted properly for everything to work correctly. I changed and adjusted mine myself. Although Necchi parts are not available from the company any more, there are several places online that carry belts and a few other items. One is sewingpartsonline.com. The belt shows up under Necchi 541, but it lists compatibility with our machines (549) on the order page. The size belt is 12 5/8"-- with teeth (lug type). While the belt is being changed the shaft that holds the wheel needs to be cleaned and oiled. Also clean up any excess oil in the area with a sewing machine safe cleaning fluid. Clean the plastic wheel with a little dish detergent and water on a paper towel. Oil should not be put, or remain, on any plastic parts in your machine. Not many people want to fix these machines anymore, but I love mine and will probably keep it as long as I can keep it running. Hope you see this post and get your machine running again. Win