Here's the manual for your machine. Download and keep it because you will probably be needing more in the future.
RICCAR 9900 Instruction Manual
SOURCE: Broken Cam
You can try;
http://www.a1sewingmachine.com/parts.html
Email your parts request to them.
Or you can contact your local dealer.
You can get an owner's manual from;
http://www.riccar.com/help/manuals
SOURCE: riccar sewing machine keeps breaking thread
Oh yes. GRRRRRR is the word!!! I hope I can help.
In many cases, breaking thread is caused by the upper tension being too tight, so that's something to check.
Another thing is to change your needle. If it's at all bent it can break the thread.
Third thing is to make sure you're using new, high quality thread. Older thread breaks more easily, especially if it's been in the sun.
Finally, clean and oil the machine. A bit of lint in the bobbin area can do all kinds of havoc.
Hope this helps!!
SOURCE: trying to sew straight stitch but stitch loose and...
No top tension, follow manual to thread top again and make sure tension dial is set to 5 and thread is pulled between the tension discs fully.
SOURCE: sewing machine and stitch issues
if you've tried to tighten the top tension and the tension knob isn't
responding the the tenison knob needs to be checked, cause it may
need to be replaced and that way the repair technican can also
check the timing of the machine
SOURCE: HOW TO THREAD MY RICCAR FREE ARM 8000
This diagram looks close.
http://www.sewusa.com/Threading_Diagrams/Threading_Pages/Riccar_Sewing_Machine_Threading/riccar_500_515_525_threading_diagram.htm
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