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Astec EarthPro Horizontal Directional Drills C series includes five models with thrust/pullback from 6,000 to 45,000 lbs — the DD-65C Mini Max, DD-1416C, DD-2024C, and DD-3238C. The Astec EarthPro DD-4045 is a new design and incorporates the same new features, but does not bear the “C” in its name. Astec engineers strengthened the frames and installed stronger hardware. Machine tolerances and alignment areas were evaluated and tightened where appropriate to achieve better fit and function. Grease fittings were added to increase durability. Pivot points were upgraded to machined-fit bushings where practical and appropriate. Dyno-testing is now used to verify performance in more units. Every machine receives a rigorous 37-point final check to ensure all areas meet certified quality standards.