Need threading instructions for my singer 1525 sewing machine

It is an industrial machine and suitable for leather, so I reckon you can use any thread you want. Seems it is a 191 D300A

https://www.google.com/search?safe=off&rlz=1C1QJDB_enCA643CA644&sxsrf=ALeKk03ofduDBUiaUauroZKdpZ1bFKp1Sw%3A1613518603191&ei=C1csYMKFC6uAtgW-3LS4BQ&q=singer+191+d300aa+thread+classification
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Service and Owner's Manuals

Singer 191D Lockstich ' Instruction Manual and ... - Singer.com

https://www.singer.com > default > files > outdated_product
PDF
Read all instructions, take care of this manual, and use it as reference when necessary. Page 5. 2. High Speed Straight Lockstitch Sewing Machine ' Instruction ...

SINGER 191D SERVICE MANUAL Pdf Download ' ManualsLib

https://www.manualslib.com > ... > 191D -

View and Download Singer 191D service manual online. 191D sewing machine pdf manual download.

Instruction Manuals - Singer

https://singerco.com.au > Support

Singer Instruction manuals for new and old sewing machines and appliances. ... Singer 15-88, 15-89 and 15-90. Singer 66k. Singer 99 ... Singer Industrial 191D. You've visited this page 2 times. Last visit: 06/03/20

try this link... Threading Machines ..or this one... How to Thread 5050 Singer Sewing Machine ..or this one... How to Thread Singer Sewing Machine

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It's possible that you do not have your bobbin or bobbin case in correctly. If you do not have your user's manual (which you should use like your bible), download it free at the Singer website. Review the threading steps for both top and bottom.

One more VERY IMPORTANT thing. On ANY model sewing machine going back to their invention from any company, you MUST thread with the presser foot UP. That is because there are tension disks that apply tension to the upper thread that are ONLY spread apart when the foot is up. If it's down, the thread can't get between them, and there's no tension on the upper thread. That might also be your problem.

There are manuals for several of the submodels of the Singer 81 class here: http://parts.singerco.com/IPinstManuals/

Call Singer at 1-800-4singer and ask why there is no free manual. Maybe they will make it available. Worth a try.

You can find Singer bobbin winding instructions at http://www.singerco.com/resources/bobbin_wind.html.

You can get the manual here.

http://www.singerco.com/accessories/manuals.html

Good luck and please rate

I suggest you do a search on youtube on how to thread a sewing machine and choose a video showing a similar machine as there are really only about 3 basic types of machine as regards the threading.
Some of these instruction videos are very good and you will find it much easier than explanations. However-the important thing is that the thread must go between the tension discs by your tension regulator and do make sure you have a good need le in the machine, inserted correctly.

You can find free manuals to down load from singer ..

http://www.singerco.com/accessories/manuals.html

Please vote !!