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American Augers’ rack and pinion DD-440T track mounted maxi rig style horizontal directional drill offers 440,000 lbs. (200 Tonnes) of thrust/pullback. The DD-440T’s standard design incorporates the Quiet Pak noise reduction system, which reduces the Caterpillar C-15 540 HP (292 kW) diesel engine decibel output to 88 d(B)A at a 7 meter range. The carriage system is engineered with a two pinion drive with an adjustable force limiter, and a maximum carriage speed of 120 feet (36 m) per minute. The drive includes a three pinion and gear drive that permits 60,000 ft-lbs (80,000 Nm) of maximum rotary torque, a rear mounted mud swivel that provides up to 1,000 gallons per minute of mud flow, a 6 5/8 inch slip spindle, and a 4 inch fluid course.