Threading a Huskylock 4600, threads remain too loose making loops on underside

SOURCE: bobbin thread bunches up creating a tangled mess under the plate

This could either be due to the bobbin being wound too loosely, or the tension on the top thread is too loose. This just happened to me the other day, and I thought it was the bobbin thread, but then I put another bobbin in with a different color than the top thread (this is a huge help in diagnosing thread issues), and I was surprised to find that it was actually the top thread that was a big loopy mess on the underside of the fabric. I fixed it by tightening the tension on the top thread (quite a bit), and everything was fine.

SOURCE: Viking Lily - free motion quilting - thread loops on underside.

I need more info.
>Where is your presser fooot pressure set(1-9) it should be around 4?
>How fast are you free motioning (faster is better? from 1-10 10 being full speed.
>Is your bobbin threaded correctly (I need to cover the basics.)?
>Never never use a needle smaller than a 90/14 for free motion (I know everyone's an expert...but trust me)
After all this, it's OK to tighten your tension up on top a little when free motioning and getting eyelashes/spider webs on bottom. around 6 should do it though.

SOURCE: MegaQuilter Tension

Try at least 2 new needles first (HLX5, preferably Schmetz). If same, look for any rough edges on the needle plate and feed dog cover.
Beyond that, this does not sound like you are doing anything wrong. You should take your machine in for adjustment by an authorized technician. You should have about 1/2 to 1 full turn of the upper tension knob between too loose/ugly on back and too tight/breaking on the top.

SOURCE: Huskylock - 530 - Serger won't create 'loop'

My stitch is good, upper and lower correct, but it will sew along and skip stitches. What do I need to do?, am good at repairing things on it all these years, I havent used it a lot the last few years, but it has started this skipping problem.

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