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Message: <blockquote data-quote="CUT_TLB" data-source="post: 9571" data-attributes="member: 1198"><p>Here is an update. It seems the hyd breaker needs to be running at max flow rate to be effective. We had been running the engine at 2/3 throttle. At full rabbit, the hyd motor in the breaker delivered more energy to the bit and the 8" stem walls were demolished. The slab has perimeter footers, so the new house will go over that (too hard to remove). We had tried many things before running at full speed: vertical attack with the full SS weight over the bit, horizontally, just an inch or so from the edge, using pre-drilled holes, etc. I would post a photo, but this forum has no obvious JPG posting utility.</p></blockquote><p></p>