(Help) - piston movement with hinge joints

Hello to everyone.
I am a beginner user, but I am not a coder, so here I am asking for help -Sorry for my english-.

I need to create a piston movement for a crane (IMG1: shows the type of model, the hierarchy and I've shown the pivots),

Now the problem:
- I assign hinge joints,
- I click the play button
- I rotate the green cylinder
- If I increase the green cylinder rotation, the white and the red ones rotate in an odd way, proportionally to the rotation given to the green pcylinder. (IMG2)
- And in the original model (not this 3 cylinder example) the red and the white cylinder are not aligned (IMG3), I think even in this example model, but probably the pistons' position does not show the problem
I show the joint that I' ve made (IMG4).
I will be thankful to everyone that will help.
Claudio