Hydraulics get the job done.

[vtsnowedin]

I think you guys that are into hydraulics projects might get a kick out of what I'm working with. The pictures show a pusher that creates 400 tons of jacking force and we are boring a four foot diameter pipe under four hundred feet of interstate highway without stopping a single commuter. I didn't think to take a picture of the generator set that powers the whole operation but it is a Cat 350 KW unit.

 

[vtsnowedin]

Here is what the front end of this machine looks like. Two men are inside it as it bores ahead,There is a conveyor about ten inches wide by ten inches high that fits down the center with the operator. I'm too fat to fit in there with everything in place.