Things get shock loaded, but they take it just fine for many many years. Those parts on heavy equipment are way stronger than say some ones 4X4 that is doing jumps over dunes or what ever. Those little dinky spindles that your tires spin on can take huge shock loads . Just hit some huge holes in a road. Or speed around on some back roads. Those auto parts are small compared to stuff found on equipment. And then there are items like wrist pins that take some super huge loads, into thousands of pounds of force, and are much smaller cross section than a bucket pin for an excavator. Why would violent movement hurt the hydraulics?