Ingersoll Rand DD-158HFA

The Ingersoll Rand DD-158HFA is a 33,810-pound, tandem, vibratory asphalt machine using 84-inch-wide drums. This eight-amplitude roller is capable of generating centrifugal force in the range of 38,280 to 44,910 pounds, and its SMART technology automatically adjusts frequency, based on the selected amplitude, "to the optimum performance setting." Other aspects of this 185-hp-machine's SMART system include automatic control of working speed to maintain selected impact spacing, automatic regulation of water flow and automatic sequencing of the lead and trailing drums.