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HINT: install a brand new needle. Remove the top thread from the machine. ALWAYS RAISE the presser foot and then rethread the top thread. The upper tension should start out set at the midway point. Use only fresh, good quality thread--AVOID old or bargain bin threads.
If the machine is threaded correctly top and bottom, but is still not catching the bobbin thread, then it's possible the machine is out of time. Search for sewing machine timing or take it for service.
Since it is an older mechanical machine, it is recommended to clean and oil the machine frequently. Oil Before using it if it has been in storage. If the machine is sticky, motor drags, etc., here's a good reference for getting it back in shape:
it's probably time to get new twin needles, the point of the left needle could be slightly damaged. I would also suggest that the machine be rethreaded top & bobbin make sure to use every thread guide clean under the needle plate and in the bobbin area for lint if buying new needles doesn't solve the problem then the machine may need to be checked to see if there is a problem with the timing.
Upper thread breaks
1.needle may be in backwards
Correct needle insertion
Correct needle insertion is mandatory for proper use of sewing machine.
Raise the needle bar to the highest point, then loosen the clamp screw to remove the old needle, place the new needle in the clamp with the flat side to the back of the machine or if using a round needle--the groove in the needle should face away from the shaft.
Push the needle all the way up to the stop or as far as it will go, then tighten the needle clamp screw
2.upper tension may be to tight--try 3 to 5
3.the needle may be bent or damaged--try rolling the needle on a flat surface to see if it's bent or not
4.thread may be hanging up in bobbin case--check area for loose threads or lint
Lower thread breaks
The most probable cause of lower thread breaking is improperly wound bobbin
1.always start with a empty bobbin
Never wind one color over the other
2.choose thread that is identical in color & type as the one to be used for upper threading
3.wind the bobbin evenly across & in layers
4.don't wind the bobbin so full that it would be tight & hard to insert into bobbin case
6.lint built up in the bobbin case--frequent cleanings will eliminate this problem, the more often you use the sewing machine the more often it needs to be cleaned
7.thread catching on the bobbin spring or latch on bobbin case, check to see that the bobbin is inserted completely & correctly, & that you are using the right kind of bobbin
also check the thread take up lever to make sure the thread has not come off of it cause that can make the machine jam up also
In order to see whether or not my euro-pro 9110 had a timing issue, the service rep had me change out the needle (making sure I was using anything but a Singer brand needle--they do not work in these machines). I re-threaded the needle, took out the bobbin casing and the plastic ring encasing the bobbin, then lowered the needle to see if the hook on the metal ring holding the bobbin actually catches the thread on its own. If it doesn't catch, it's a timing issue and needs repair. They can walk you through this process of troubleshooting and set up repair if need. Call Eruo-Pro's customer service center for sewing machine service and repair at 800-798-7395