Tried a new post hole digger on a rocky job and got a surprise
Got a contract for a fence line in the hills outside Boulder, ground looked tough. My old two-man auger was acting up, so I rented this new hydraulic drive unit, the kind with the separate power pack. Figured it would chew through anything. First few holes went fine, then we hit a patch of what felt like solid rock. The machine started shaking like crazy, then just stopped dead. Turns out, the shear pin was gone, but the real shock was finding a smooth, round river stone about the size of a bowling ball right where the pin sheared. It was perfectly buried. Learned that even the fanciest gear can't beat old ground, and you always need a digging bar and a spare pin kit on the truck, no matter what. Anyone else hit a hidden rock that completely stalled a machine?