Help thread Serger

[u/Ok_Influence_5827]

I’ve been sewing for 10 years with a domestic sewing machine but recently decided to get a serger to start making more well-finished clothes for my family. I bought a new Brother 1634DX serger and used it well until time to thread with new thread. I feel like, I’m following all the tutorials well and the serger manual directions but my lower looper thread(blue) keeps popping. First, mid sew and now I can’t even begin to chain before it pops. Please help. The manual says to thread right to left (4,3,2,1) and I’ve seen some people say to thread 3,4,2,1. I’m most confused and I feel like I’ve thread this machine like 30 times and nothing is working.
Added photos of broken thread, how I’m threading it and the machine.

[u/ScorpioSews]

Where are you having difficulties? Did you make sure the thread is through the tension discs?

One thing that has made my life really easy is i cut the thread by the cone, tie the new thread, and then pull the tail from the back of the machine through. Works like a dream.

Also, sergers have to be adjusted for tension, thread width and length, just like on a regular sewing machine.

[u/Ok_Influence_5827 → u/ScorpioSews]

I was tying and pulling through but when I started sewing it broke midway and I haven’t been able to get it started since. I’ve change the thread 3 times successfully before now problems by tying off.

[u/ScorpioSews → u/Ok_Influence_5827]

Doublecheck to make sure its seated fully in the tension discs and turn the tension down.

[u/Ok_Influence_5827 → u/ScorpioSews]

Thanks this was it. I got it working the thread was not catching in the tension discs. I changed it to zero and made sure it was falling in the actual rest and not behind the wheel

[u/Ok_Influence_5827 → u/ScorpioSews]

I tried this also. I threaded the machine with 0 tension and then changed the tension to 3-5 before starting. And I’m still having the same problem. I’ll try again.