Liebherr has developed an innovative concept for erecting LR 1600/2 crawler cranes with long wind power boom systems efficiently and safely: Using the mass of an LTR 1220 telescopic crawler crane as the counterweight significantly reduces the amount of ballast that has to be transported and eliminates ballast handling on site.  

Liebherr is one of those companies that I as an engineering student would love to visit. Yeah lifting and lifting equipment aren't probably what I'm going to end up doing, but... damn everything they demo is incredibly fascinating.  Very clever. Using the crane that would normally be on a job site to perform smaller lifting as counterweight is a huge time saver and efficient.  Something I noticed: Liebherr makes a lot of crawler-track telescoping boom cranes. You see those very rarely in the U.S. (though I have seen them used on the railroads for things like re-railing locomotives).  Do you sell more or these cranes in Europe, or are they becoming more common in general
Either way it is a VERY clever use of one to use as a counterweight with the crawler crane to get its jib fully raised.  Kudos to your engineers for that!  very cool, no need to bring all the extra counterweights just to raise the boom since you already need to have assembly cranes on site to erect the big boy.... just use them for additional purposes... nice and creative by Liebherr to outfit the end of the boom and the counterweight system with that joint/pivot connection. And did you see the weight of those endless loop straps how hard that guy was working to move it and disconnect it from the pin on the undercarriage of the LTR 1220 lol