Scissor Lift Not Working

Here is the specs of my scissor lift:
4 393 Motors
Elastics on Both Sides
7:1 gear ratio
4-Staged Scissor Lift
Powered Horizontally

I have checked each motor individually, all are turning the right direction. All my joints are loose with washers in them. Using power expander. It can’t even lift one cube!!! WTF!!!

Also here is a picture

heres the picture

Some photos showing more close-up detail of your drive, bearings, etc. would be helpful.