Liebherr's prototype PR776 bulldozer ripping hard compacted boulders and gravel. This material is much harder than it looks. The quarry has what I estimate to be a 100ft vertical cliff with some overhangs that shows not the slightest hint of instability. The operator of the Liebherr dozer finds it to be a better machine for ripping than the equivalent Cat D10T he has experience on.

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