Hand-held breakers are one of the many tools that can be run by hydraulic power. Also available are concrete saws, scabblers, grinders, rock drills, and other tools that are run hydraulically instead of by an air compressor or a generator. Hydraulic tools work like air tools, but with motors or cylinders driven by hydraulic fluids instead of air. They run off closed systems, which recirculate power with the hydraulic fluid. At most jobsites, a hydraulic system is readily available on backhoes, skid steer loaders, dump trucks, or other construction vehicles. In areas that can't be reached by trucks, portable power packs run the tools.
The hydraulic systems should generate no more than 200-psi back pressure at the tool when operating at the maximum flow for the tool type. Too much back pressure makes the system overheat. Other essential features for hydraulic power sources include a filtration system and a pressure relief valve. Hydraulic tools generally cost more than their air counterparts. But because of better efficiency, hydraulic tools don't use as much energy. In cold weather, hydraulic tools won't freeze up, but they do operate sluggishly until the hydraulic fluid heats up. There are workplace benefits too. Compared with air tools, they run quieter and cleaner.