Thanks for your response,
It's kaup 2T013, if I had it's hydraulic circuit I could figure out where is the problem, it's cylinder doesn't have check valve on pressure port.
There is a block on clamp I must know what's going on inside it.
I should to add, it happens randomly not always. And it makes it scary.
Where should I find the hydraulic diagram?
This is ONLY to be used to report flooding, spam, advertising and problematic (harassing, abusive or crude) posts.