The Bernina 730 Record is a great little machine. If the selector levers are sticky/stuck or the handwheel is stiff or does not turn, about 98% of the time the machine needs oil.
Mechanical machines need to be cleaned and oiled regularly just like your car. If the machine sets in storage for a while or is used often but not oiled or cleaned regularly, the oil that exists in the machine will eventually thicken and acts like glue. (Sometimes you can see a dirty-looking dark gold or brownish goop which is usually old oil.) Then your machine is frozen.
First, open the top and bottom of the machine and sweep out any dust, dirt, lint, or stray threads.
Now, oil your machine (there's a diagram below). There are quite a few oil holes (both in the top and bottom of a Bernina mechanical) that require periodic oiling (see your machine Manual). If a metal part is frozen, buy a bottle of liquid Tri-Flow Synthentic Oil (from the hardware store) and put one or two drops in all the spots shown in the manual. (DO NOT oil rubber parts, the two white plastic gears, the belts, or the metal CAMs!!! NEVER use 3-in-1 oil, cooking oil, WD-40, or oil from your grandma's sewing box. And do not put more than one or two drops of oil at a time as over-oiling will also damage your machine.) It also helps to slowly hand rotate the handwheel and, while watching things that move, apply 1-2 drops of oil every place that metal rubs against metal. Do this also with the selectors and dials.
Then, using your hand-held hair dryer, direct hot air into the internal part of the machine (top and bottom). The metal may become hot to the touch. Then try to gently move the handwheel and the selector levers. Repeat. Let it set overnight. Then test again the next day, and repeat the process if needed.
To maintain your machine, a good recommendation is to oil every time the bobbin thread is changed, every 8 hours of constant sewing, or every six months if the machine is not in use. Use a good quality oil, ie Bernina oil for "mechanical" machines. When oiling, also be sure to brush out the dust and lint (especially around the feed dogs and bobbin works).
If the oil in your tube looks dark colored, throw it out and get some new. I've run across some old sewing machine oil in the can that looked like dark honey and stunk to high heaven. Get rid of it!
Treat your machine well and it will serve you well for many years.
This is an oiling diagram of an 830 Record which is very similar to the 730.
This is an oiling diagram for the 930 Record. Also fairly similar.
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SOURCE: Bernina 730 Can't open top cover !
The problem is that of a stuck piston detent on the pattern selector support that snaps the top cover closed.
Testimonial: "To swiss_tech Great help. Very much appreciated. Thank You"
SOURCE: My Bernina 730 record can only run the zig-zag
Sewing machines needs full service now and then (every 10 years will often do). The motor on the 730 series is actually as powerful as they get on domestic machines, and handles just about everything that fits under the pressure foot. Only if the machine has been used a lot over the years are the brushes worn down, but it might need new grease not matter how little it has been used.
However, the stitch applications can sort of gum or clog up if the machine has not been used for ages. Take a look in the manual and oil ever point suggested every time you take out the machine. Try them now and then on slow speed, that might get every function to run smoothly again.
This is as good a machine as any out there, favorably compared to any new machine under 500£. It sews perfect stitches on just about any material, and is well worth a full professional service (At a shop they will always recommend a new machine they want to sell you). All kinds of pressure feet and accessories are available in regular sewing shops and online.
Check with different shops for price on full service. This is a great machine what ever they tell you.
SOURCE: bernina 730 cam gear replacement and alignment
It does not matter where the position of the camstack is when you put it in, it should not affect any other part of the machine.
SOURCE: I am replacing the cam gear on a bernina 730
Should not make any difference, put the camstack in, there should not be any timing marks and it should not affect the machine
SOURCE: need bernina sewing machine model 730 manual
Here is a download - http://www.berninausa.com/webautor-data/486/BERNINA_730_731_732_manual.pdf
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