Please don't use WD40 on your sewing machine, WD40 is an alcohol based cleaner and will do the opposite of lubricate. Take your machine to a certified Bernina Repair shop, they will have a look at the timing and lubricate all of your gears. Lubricant will dry out over time, grease turns to putty and oils turn to varnish after several years of non-service. Lint is attracted to moisture, moisture being those key areas of any machine. Lint acts like an oil wick and will draw out your lubricant from key areas. It then begins to attract dust and other nasty things over the years to become grit. Your motor begins to burn out due to stress trying to move all of these clocked gears, cams and shafts. Take your machine in!
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Re: Bernette 800D seized up
Be sure to oil your serger frequently as directed in your manual (use SERGER oil--Bernina sells it). A serger sews so much faster than a sewing machine therefore needs oil AND cleaning more frequently. If you notice that it is sounding a bit noisy, clanky, or the motor sounds like it is straining, there's a good chance it needs a thorough oiling by your Bernina technician.
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If this is an older mechanical machine (ie, NOT computerized), sounds like it has not been cleaned and oiled in quite some time and the old oil has solidified. DO THIS ONLY IF IT IS A MECHANICAL MACHINE! Consult your owner's manual, get some good quality sewing machine oil (not your grandmother's oil tin, 3-in-1 oil, WD-40, or cooking oil). Start with 1-2 drops of oil each place as directed by the manual. Gently hand-rotate the wheel (do not try to run the motor until the internal mechanics of the machine are moving freely!). To speed things up, direct heated air from a handheld hairdryer into the interior mechanism. You may need to repeat the process every day for a few days before things loosen.
The machine should be oiled every 8 hours of constant sewing, every time a new bobbin is installed, before its use after it has not been used recently, or at least every 6 months if it is in storage.
THIS IS HARD W/O BEING THERE. ANYWAY HERE ARE SOME IDEAS:
1. REMOVE BOBBIN, CARRIER AND CLEAN AREA. OIL IN THE RACE (UNDER WHERE THE CARRIER GOES)-ONE DROP ONLY. TRY TO HAND ROTATE. IF IT IS OK THEN THE BOBBIN CARRIER WAS INSTALLED WRONG.
2. MOVE THE NEEDLE BAR BY MOVING THE HAND WHEEL. PLACE ONE DROP OF OIL ON THE BAR.
3. REMOVE THE TOP OF MACHINE AND MONITOR ALL MOVING PARTS AND CLEAN (USE QUE TIP). ANY PARTS STUCK TOGETHER MAY NEED A SMALL AMOUNT OF CARBURETOR CLEANER. OIL ALL MOVING METAL PARTS THAT MAKE CONTACT WITH EACH OTHER.
4. UNDER THE MACHINE REMOVE THE LID AND CLEAN AND OIL JUST AS ABOVE.
5. TRY TO MOVE THE HAND WHEEL.
6. IF THIS STILL DOESN'T WORK THE BELT MAY BE OUT OF ALIGNMENT. THE BELT HAS TO BE DONE BY REMOVING THE HAND WHEEL. ONCE THE BELT IS ACCESSED THE BOLT UNDER THE MOTOR IS LOOSENED. IF POSSIBLE TRY TO APPLY THE FOOT PEDAL A LITTLE WHILE ADJUSTING THE BELT. IT SHOULD NOT BE REAL TIGHT BUT MUST BE IN ALIGNMENT. PAY ATTENTION TO THE AMOUNT OF TURNS IT TAKES TO REMOVE THE OUTSIDE SHINY PART OF THE HAND WHEEL SO IT IS EASIER TO SET IT PROPERLY.
You said the hand wheel barely moves. Is that all the time? If the hand wheel is hard to turn the motor is getting overloaded and is protecting itself by stopping and giving you the error message. You need to determine why the hand wheel is tight. There could be thread caught or something might need lube. These are non oiling needed machines however sometimes a linkage might need fresh lube.
Sound like the whole unit needs a good cleaning. My rule is "if it moves give it a lube", be careful not to get oil on electric boards or in the motor. What is the make and model of your machine. I will try to help you more.