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Re: timing a viking 990
Impossible to explain how to time a sewing machine you need to be shown. Basically it entails setting the needle depth then making sure the hook passes just above the eye of the needle at a set height as the needle is rising, this ensures the hook catches the upper thread. Also the hook needs to be set a specific distance from the needle. Sounds easy but sometimes it can be very difficult and fiddly job.
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Most Viking dealers or repair shops should be able to get parts for you. Some that I know of that are available online are: http://www.sewingpartsonline.com/viking-990-sewing-machine-parts.aspx
Ron Anderson at A1 sewing is someone I've known for about 20 years on the net... he's always been helpful to DIYers on the usenet group "alt.sewing", and has a good reputation as a source of parts: email@example.com -- I'd try him if you don't have a good local repair shop.
IIRC, the 990 is electronic, and you may not be able to find boards for it anymore.
And FWIW, I mostly sew on a Juki F-600; like the old Vikings, it just works.
Could be a bent needle? please change it for a sharp new one and make sure it goes in correctly, flat shank to the back.
Bobbin case dislodged or not in correctly ; I think these are vertical rotary hook machines with the bobbin inside a removeable bobbin case? Check that you have put the case in correctly, there is usually a long finger on the case that latches into a point on the rotary hook, holding the case in the correct position. Probably also a latch on the front of the bobbin case, which you use to fit it into place and remove it.
Lastly could be that the machine timing is out. Manually turn through a stitch sequence with no thread or bobbin, the needle needs to be at its lowest point down into the bobbin area when the rotary hook brings the thread around to catch at the back of the needle.
If you suspect it is the timing, you may want to get a technician to do this repair but certainly try the first two items first.
sounds like hook to needle timing has shifted. Take to authorized Husqvarna Viking dealer for repair. This is not something that can be done by the owner. Check Husqvarna Viking website for dealer closest too you.
One of the things that can cause this is lint buildup around the back of the hook driver. Open the bobbin cover and look just above the hinge, at the bottom edge of the black hook cover. If lint is peeking out at you, it may be time to have it serviced. You may be able to get most of the lint out if you remove the needle plate and blow onto the back side of the hook area with canned air. Keep the cover open so the lint can come out. Now I am assuming that you have replaced the needle.
When the thread breaks too often, try these, that goes for all sewing machines
1. Replace the needles,
2. Loosen slightly the tension of the needle threads.
3. The top threads are to thin,
4.The sewing (rotary) hook or looper, has burs,
5. Wrong threading