Powered by re-engineered Tier 3 Isuzu engines, Link-Belt X2 series excavators are billed as being the most fuel efficient excavators on the market and more productive in trenching and truck-loading applications. The engine uses a common rail fuel injection system that provides up to 10 percent more hydraulic horsepower. Two-speed boom lifting and arm open/close functions work with hydraulic-system regeneration for faster cycle times, the company says.