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Your machine could probably use a good cleaning and oiling by a technician. Given that it is 40 yrs old, it may have set for some time without any oiling and the oil may have dried and the machine may seize.
Okay, from the pictures I found, you have an oldie but a goodie. This is a mechanical machine and most likely has been setting without use for some time. It needs a good cleaning and oiling. The old oil has dried and turned to goo, preventing the parts from moving. If you have the manual, consult the instructions for oiling and cleaning. Use good quality sewing machine oil (NOT 3-in-1, WD-40, cooking oil, or the oil you found in your grandmother's sewing basket).
With the old mechanicals, the best thing to do is take any covers off that you can. Gently wiggle the handwheel and watch where metal rubs against metal and apply one-two drops of oil in each spot. Look for oil ports where oil should be applied. Do NOT oil any plastic gears, Cams, or belts. Don't forget the top left side where the needle mechanism resides and the bottom of the machine, especially the mechanics for the bobbin area. Also, move any dials and levers and oil those if possible. To speed things up, direct hot air from a handheld hairdryer into the machine's interior. (Don't burn yourself!) Then re-test and see if things have loosened. Repeat oil/heat and retest until your machine is moving freely.
Be sure to keep your machine cleaned and oiled on a regular basis (every 8-10 hours of constant use or every six months if not in use) to prevent this from happening again.
There are some areas of the machine which cannot be accessed for home servicing - the covers need to be opened up to access them. If the hand wheel is heavy to turn then you may be at the beginning of a needle bar seizure, given the noise at that end of the machine - this will usually sound like a groan. We see this occasionally in machines which have been worked hard without servicing. If you have caught it early, it should be solved by a service at your local sewing centre.
You can loosen the screw on the back and slide the end cover off and put a couple of drops of oil (use only light machine oil) on the top of the needle bar, which will run down to the bearing surfaces, but if that is dry enough to be making noises, the other internal bearings will also be looking for some love.
The first thing a machine needs is oil. Absolutely soak everything that turns. My upholstery machine sits for a while and it gets stuck too. Believe me you don't just turn it. The tolerence is so close its just hard to get broke loose. Use a spray that absorbs rust. then oil good when done
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