Thank you for your message.
Let me explain it more, actually the hydraulic system works functionally good the components and clamp jaws also are good enough.
The rolls weight are mostly more than 900kg , less 2000kg so the diameter is considerably big.
This accident occurs when more than 50 rolls would be unloaded.
I want to know that is it usual everywhere?
Is there any extra instrument or equipment to decrease the risk of this damage?
Or still you think it is a hydraulically malfunction ? Despite working many hours after that crash!