hey guys my elba boom keeps dropping slowly. when sitting between trucks, anyone know why,could it be a check valve      or  somthing?

It is just a boom holding valve.

Isolate it by extending all sections to their max....... go eat breakfast, When you get back hit the up functions one at a time (while watching your boom)

The one with the bad holding valve will move up; the rest will have stayed up.

Call Art, see if he has any holding valves. Call Tim Oliver, he will.  ;~)

"it's just a boom holding valve"

nice, no problem, sweet

Pretty common on an Elba.

If you have never changed one don't try it until you have the entire program understood. If you follow all the rules it is safe and easy; if you don't it is deadly.

thank you so much guys,this web sight is the best think that ever happen to concrete pumping!!  (god bless)