while its working, boom 1 suddenly moved steadily upward and could not get off... 

I had something like that happen before. Turned out an internal componant in one of the #1 section holding valves got jammed sideways (no idea how that happened) and the section would not come down. That was a long day.

You are talking about a stack valve yes.

turns out, the problem is the mixing of hydraulic oil # 1 with # 2, due to the rupture of the connection between the oil hose from valve # 2hidrolik, which causes # 1 # 2 part moves when driven. so, I took a new hose to connect directly from the solenoid valve to the hydraulic tube neple. and running perfectly