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1. If you turn the hand wheel with your hand and the needle doesn't rise or fall you will need to tighten the hand wheel.
2. If it is really hard to turn you may need to take the top, bottom and front covers off. Clean everything with rags and qtips. Some places may need carburetor cleaner.
3. Grease all gears.
4. Oil all moving metal against metal parts.
Once it is going make sure again that you have oiled everything.
5. The bobbin case and other parts need to be removed and carefully cleaned. The race (part the hook rides on) needs only one drop of sewing machine oil. Don't oil the other parts. NOTE: It is an old machine and has probably set in a garage so there may be a build up of rust. To get the machine going you may have to overdose it with wd40. Force the machine loose if necessary. Afterwards the wd40 has to be removed. Oil the sewing machine with sewing machine oil.
before you race the machine into a service centre, most hard to turn problems are from thread and fluff wound around the bobbin shaft in the base of the machine. Use a pin/ needle to remove the thread /fluff then oil the machine using light machine oil. If it is still stiff , take it to a service centre.
what model machine? First check that the bobbin winder is not engaged or the wheel on the inside of the handwheel is tightened, by turning towards the back of the machine. Often times on older Berninas the basting mechanism gets gummed up and has to be completely disassembled and polished/oiled as the replacement part is not available.
not knowing your machine make or model, I can only suggest that you are having "tension" issues. Most machines have tension control located around the wheel, sort of like a second very thin wheel. This type usually requires that you would hold the wheel in place while moving the 2nd wheel to make the adjustment.
Other machines have the tension control looking like a push button. Maybe in the middle of one of the other tenstion wheels. pushing that button in while turning that and/or other control wheels would help that.
I may also be that your machine just needs to be oiled. Fabric stores will have this oil and it is specially formulated for sewing machine parts. More is less w this type of oil.
T ake a look all around and even under the machine, hopefully you will find a number for tech support for your machine.