Makes large tracked trenchers (wheel, chain cutter bar), and variants: drainage, canal, rocksaws, roadminers; use mechanical powertrain for more power, production, uptime, less energy, repair; new, used, parts, consulting. Texas, USA. Astec Horizontal Directional Drills now come standard with one of the best warranties in the industry. All drills manufactured in the company's Loudon, Tennessee facility are covered by a 2-year warranty, and a 5-year rack-and-pinion warranty.* Choose Astec with confidence. Come see our powerful and reliable EarthPro Series Horizontal Directional Drills.