Infos about the model:

The front shovel ist linked to the UNIMOG's pneumatic-system. 

The Tipper is tiltable and also driven by de Unimog's pneumatic System. To install the pneumatic-cylindet of the tipper, I had to remove some parts of the frame. The valve which controls the pneumatic-cylinder of the tipper ist located on the passenger side right behind the pneumatic pump.

More pictures of LEGO models on

http://mb1632s.de/wieallesbegann.htm