Here I am back in 2008 digging eight 5-foot deep holes for some 24-by-24-inch “bigfoot” post bases and 10-inch sono tubes that will become the foundation for a new 20-by-30-foot workshop. The Micro Hoe plans currently include the original 350-pound backhoe that can dig up to 5.5 feet deep for garden tractors, and I am also including a page that shows how the crowd arm can be lengthened 12 inches for a digging depth of 6.5 feet. this includes increased leverage required for the longer arm and a 2-inch longer crowd arm cylinder.
The extend-a-hoe prototype you see in this video is able to dig about 7 to 7.5 feet. deep or so (for compact tractors) and weighs about 425 pounds. The extend cylinder runs off a foot controlled single spool valve (under my right foot) via the power beyond port on the main backhoe controls. The extend-a-hoe option requires a fair amount of work (and cost) to add the additional 20-inch reach above stock, which is why most folks end up simply creating a 12-inch longer single piece crowd arm with thicker wall than the stock unit for larger tractors that can take the additional weight.