By Katie Weiler, Managing Editor | September 28, 2010

HammThe HD O120V and HD O70V asphalt rollers have conventional vibratory systems on the front and oscillating drums on the rear. Oscillating compaction applies horizontal force to the asphalt, rocking the drum forward and back, instead of conventional vertical force. The HD O120V has 78-inch-wide drums and an operating weight of 26,345 pounds. The 131-hp machine has a working speed of 3.9 mph. The HD O70V is a 16,325-pound roller on 59-inch-wide drums. The 80-hp unit works at up to 4.6 mph.