This excavator is completely selfbuild, and is, as far as i know the most powerfull and technically advanced excavator in the 1:14 scale.
It has full hydraulics, even the tracks and the slewing, and the pump has an servo controlled backplate, which makes this a model with load sensing.
It weighs about 60 kg and works on 60 bar pressure. It has a demolition boom, an can be fitted with an long boom. It also has a hydraulic hammer, able to break trough two inch thick concrete. This is an terrible beast of a machine.
Here a movie from a German forum with the hydraulic hammer. The pumpnoise is from the other excavator, this machine makes practically no noise, well except when it's hammering of course.
http://www.youtube.com/watch?v=vqcYg...embedded#at=89