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There are quite a few pictures of threading diagrams on the internet. Just perform a search for the make + model + the word "threading."
Be sure to follow the threading order specified in your owner's manual. If the order is not followed accurately, the machine will most likely not work properly. Also, be sure to RAISE the presser foot BEFORE threading. While threading each thread, grasp the thread with one hand between the thread tree and the tension disk and grasp the thread below the tension disk with the other hand and gently tug the thread to make sure it has seated in the tension disk. With most sergers, the lower looper thread MUST drape over the top of the upper looper in its final threading process Before being pulled under the presser foot.
If any either looper thread breaks or comes unthreaded, it is the best advice to unthread all the looper threads and re-thread from the BEGINNING. Just bite the bullet and do it. It will save a lot of frustration.
I found two things for your consew, but neither of them have threading information. Generally, you thread a serger like this. Upper Looper, Lower looper, needles from right to left. If you ever break a thread... remove all other threads and begin again from the upper looper thread. (I know... it's a pain) Here's a video that is NOT your machine but explains pretty well.
I would suggest that you check the needles again, make sure they are both fully up into the needle housing. Also they should be at different heights in order to form the stitch sequence.
It is important that you thread the loopers first in the sequence shown in your manual, then the needles. So you may need to recheck the threading again and make sure the threads are in all the eyes correctly, especially the lower looper. Also some overlockers, have a sliding eye on the lower looper for ease of threading, if yours does, make sure it has been slid back to normal operating position.
When you have checked the threading up, take all four threads under the raised pressure foot and make sure that the upper looper thread and lower looper threads are not crossing over each other. Lower the pressure foot and try to chain off again. I hope this helps you to resolve the issue.
Has it ever chained off since you bought it? If you purchased it second hand it is possible that the timing of the loopers is out and this will prevent a chain from forming.
However, I'll go through general overlocker/serger troubleshooting for threading up. The critical things are to thread it exactly as the diagram shows, some sergers have a diagram inside the front looper cover so its easy to refer to when you are working on the machine. Or use the manual diagram. There is a sequence you need to follow in threading up, usually upper looper, lower looper, then the needles. This is important. Then you pull all four threads under the raised pressure foot, lower the pressure foot, and start to stitch and hopefully a chain forms. If you need to change a thread you can knot on a new colour, turn the tension to zero, then pull through the new thread. Pull the knot right through the looper eyes but you will need to cut the knot out and thread the needles with the new colour once you get there. Then turn tension back to the normal setting (5 usually) and again pull all threads under the foot.
The timing of the two loopers to the needles is critical to a stitch forming though so if you have tried everything and aren't getting a result; then perhaps its time to take it to a service centre, get it checked out and if it works fine for them, ask for a quick demo of threading up, then do it yourself with the demonstrator watching.
Overlockers are very different to sewing machines and there is a learning curve but once mastered, they are so quick and give a great finish.
All sergers thread the same way and sergers have to be threaded in a certain order. I made a jingle out of it...
It would be best to have a tweezers handy to help with the thread and threading.
always be sure the lower looper thread goes over the top of the upper looper then out the back. I would be surprised if your thread guides are not color coded.
If you look at the top thread guides or the spools. First from left to right thread the 3rd spool, then the fourth spool. Then you thread the right needle (the second spool) then the left needle (1st spool.
The lower looper can be tricky because you have to thread it from the back of the looper to the front.
Pull the threads out the back from under the foot. Then go ahead and run it slow watching to see if it starts making a chain. It should. If not do it over again.
The order of threading is most important. If you letter the tension knobs from left to right A,B,C,and D. The order for threading it is C,D, B, A. There are two arms under the needle that cross each other called loopers. The order is upper looper, lower looper, right needle, left needle .I'm sure there is a diagram under the cover when you open it. Most do. It would be very helpfull to use a long threading tweezers to guide the thread through the holes. The lower looper has a hole in the back to put the thread through then through the front hole ( though some newer sergers have a lever that you put the thread on and it does it for you and over the thread of the upper looper and out the back.
It would help alot more if I knew the brand and model of your serger so these are basic instructions. Hope I helped.
Solution taken from "Handbook for Huskylock Sewing Machine Models 1001L/1000L/1000"
1. Raise the presser foot by using presser foot lever. When the presser foot is raised, the two thread tension discs in the thread tension control panel are released so that thread passes freely between them. Otherwise thread tension may not be correct.
Important! When threading the needle, always be sure to lift the presser foot lever, and also take care to thread in the proper order.
Threading order: 1. Upper looper thread (green) 2. Lower looper thread (blue) 3. Double chain stitch looper thread (purple) in case of 5 thread stitch or double chain stitch 4. Right needle thread (red) 5. Left needle thread or double chain needle thread (yellow)
Caution! Because the left thread tension dial (yellow) is used for either the left needle or the double chain stitch needle, these needles will never be used at the same time.
Upper looper (green) sequence: 1. Thread holder (silver triangle openings attached to thread holder stand) 2. Thread guide (flat silver clips just behind thread tension disc) 3. Thread tension disc (circular knobs with numbers for tension setting) 4. Pull thread around upper looper guide and upper looper 5. Pull thread into hole of upper looper
Lower looper (blue) Repeat 1, 2, 3. 4. Pull thread around guide (see color coded chart inside front serger cover).
Easy threading mechanism (for lower looper) 1. Pull out the lower looper threading lever 2. Thread the lower looper and position the thread on hook of the lower looper threading lever. 3. Push the lower looper threading lever back to its basic position while holding the end of the thread.
Caution: When returning the lower looper threading lever, always make sure that the two blue triangle marks (directional arrows) meet each other.
Right needle thread (red) Left needle thread (yellow) Important: Thread the needles after threading of lower looper and upper looper. First raise the presser foot lever, and then thread the needle threads in order shown in color coded thread guide.