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Best advice would be to consult your owner's manual. The most common serger problems are caused by incorrect threading or not threading the threads in the proper order. With most sergers, the upper looper should be threaded first. The lower looper is threaded second and the lower looper thread tail should drape OVER the upper looper. Then thread the needles.
Be sure when threading that each thread is pulled snugly into the tension disks.
if you look closely at the components of the machine they should have small marks on them that line up with each other or marks on the case. most sewing machines are timed this way the marks have to be lined up on both arms and that should work.
try changing the needle try rethreading the machine top and bobbin make sure to use every thread guide-this is improtant for the thread tension make sure the bobbin is turned correctly in the bobbin case also could be a problem with the computer motherboard or there could be a problem with the timing
check the bobbin to make sure it's not warped
check the needle to make sure it's not bent-roll on flat surface to see if it roll correctly
make sure the bobbin is in the bobbin case correctly
make sure you have a 3 to 4 inch tail on the bobbin-so the upper thread can pick it up easily
make sure you have a 3 to 4 inch tail on upper thread also as it picks up the lower thread
or you can hold the upper thread with your hand to the side of the machine & use the handwheel to lower the needle as it picks up the lower thread
pull both threads to the back behind the needle
make sure there is no lint or loose threads in the bobbin area
you can go to www.juki .com
under industerial sewing machine youy can download DDL 8700 instruction manual it's same DDL8300 model.
now you can do next steps
1- change needle with new one.
2- you can find tow mark on needle bar the upper mark for adjusting the hight of needle bar bring the needle bar at lower position and check if the upper mark aqual with the lower bushing or no.
3- when the lower mark aqual with the lower bushing at this time the blad point of hook must be at the center of groove for the needle if no lose tow screw for the hook and readjust the timming between the blad point for the hook and grove for needle bar
ashraf abozid email@example.com
How to Thread Juki MO-134 Serger from watching lady at Lyles.
Turn upper blade up. Push in first then turn up.It makes threading easier.
Blue Thread upper looper first.
Pull thread through tension knob. Don'tjust lay it there. (She thought that is what I must have done)
Orange Thread lower looper next.
Pull thread through tension knob as inthreading upper looper.
Adjust lower looper so it is right nextto upper looper so that their points are almost together and directly belowsewing needles. Lower looper will be in front of upper looper (I believe).
With tread from upper looper pulledback, slightly lift lower looper above upper looper and thread. I think this isright.
Pull thread back with other thread.
Tension is the key. Remember that.
Yellow: Thread left needle first.Remember tension. Pull thread through curled wire on left side of needle arm.
Green: Thread right needle. Rememberabout tension. Pull thread through curled wire on right side of needle arm.
Note: Before sewing turn the wheel tomake sure the stitches are going together correctly.
- check ifu are using same needle model. - check hight of needle bar is ok - check timming between needle bar and hook. - check if your material is very stritch or no - check blad point of hook is ok or no best regards
There are no specific specs other than "eyeballing" it. Make sure the bottom blad is level with the plate of the machine. The upper cutter should meet and overlap slightly. It is usually a trial and error thing to get it aligned. Good luck.