I have a serger sewing machine the motor is running but the needles dont move
It sounds like you have a broken belt. The belt connects the motor to the large handwheel on the right side of the machine. Usually the side cover comes off with just a couple screws and exposes the motor belt, however some require removing the back cover also. You should be able to get a belt at your nearest sewing machine repair shop. Take your old one with you so you get the correct size.
If you open the side of the machine and the belt is not broken. The pulley on the motor may be damaged.
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