Often a drop of oil on the shaft in the center of the hook will solve the noise. There is a special gauge to measure the clearance between the hook and the hook cover (also called the shuttle). Try the oil first.
SOURCE: Bobbin Case Assembly
Careful now, don't get in too big of a hurry.
The back side of the hook cover, which holds the hook in place in this machine is supposed to have several grooves in it. If there are no cracks, it's probably ok. The hook should also have a considerable amount of movement, or clearance when the cover is in place. Take that away and it won't sew at all.
The most common noise I hear in these machines is a buzzing or moaning sound from the bobbin area. If this could be an apt description of your sound, remove the bobbin case, roll a cotton swab between your fingers until it will fit inside the center post of the bobbin case and clean it out with alcohol. Allow it to dry completely and then put one drop of machine oil inside this post, place it in the machine and run it. The sound should be gone.
SOURCE: The bobbin thread on my Viking Designer 1 is too tight
In most cases, this is caused by loose threads and fluff being in the upper tension unit rather than a problem with the bobbin. There is a screw on the bobbin case that losens and tightens the resistence. However, it can easily come out and then you have a mess.
Try this to check the bobbin thread tension -
Take the bobbin case holder out of the machine. Use a bobbin that is about half full and use standard 50 wt sewing thread.
Take your needle plate (the metal plate over the feed dogs that has markings showing stitch width under the presser foot).
Thread the bobbin thread in the bobbin case, holding the case so that the thread is through the tension spring as though it is in the machine, tied the end of the tread to the needle plate and have it hang below the the bobbin case.
If the needle plate immediately drops to the floor, unwinding the bobbin, the bobbin tension is too loose. If you jiggle the bobbin case slightly up and down and the needle plate moves slightly down, it is just right. If it does not move at all it is too tight. The resistence should be 14g which is the weight of the needle plate.
The upper tension unit, look straight down from the tension unit and you should see some metal disks which the upper thread rides through when threaded. Take your small cleaning brush and brush out any loose threads/fluff there. Look down the left side of the tension unit to make sure there is none hiding.
When you tighten the upper tension unit by pushing the tension buttons on the screen, do you hear the tension disks tightening? If not, it may be the pc board or the tension unit itself that will have to be replaced.
Otherwise, you might want to take it to an authorized husqvarna viking dealer for service. You can locate a dealer near you by visiting the husqvarna viking website and clicking on the Dealer link on the left-hand side of the page - http://www.husqvarnaviking.com
Good luck
SOURCE: Bernina 180 Bobbin Case Housing Loose
The housing you are pointing out is the rotary hook asm. This is suppose to have a little clearance there, the clearance allows for the lower thread to come up. In order to make the machine run smoother in that area, is to put a drop of the benina only oil
SOURCE: my janome MC9500 is making a terrible noise -
try these sites
sewingpartsonline.com
sewvacdoctor.com
whitesewingcenter.com
sewingpartsdirect.com
sewingsupplywarehouse.com
sewforless.com
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