The HAMM HD+ 90I VO is a high-performance smooth drum roller designed for efficient and precise compaction. It features a 66.2-inch wide drum with a diameter of 47.3 inches and 0.7-inch thickness, optimized for delivering strong centrifugal forces of 16,860.7 lbs (high) and 13,488.6 lbs (low) to ensure deep and uniform soil compaction. The drum incorporates oscillation technology with an oscillation force of 28,775.6 lbs and frequencies ranging from 39 to 50 vibrations per minute, enhancing compaction quality by applying forward-backward tangential shear forces. The unit includes a static linear load of 157.4 lbs/inch and nominal amplitude of 0.1 inch for consistent compaction density. Powered by a DEUTZ TCD 3.6 L4 four-cylinder engine rated at 114 hp (113.9 hp net) at 2300 rpm, the roller meets EPA Tier 4 emissions standards. It is equipped with a 45.8-gallon fuel tank and a 5.3-gallon DEF tank, supporting extended operation times. The water spray system holds 220.4 gallons for dust control during compaction. Its dimensions include 9.8 ft height to cab top, 193 in length, 6 ft width, 31.5 in ground clearance, 145.7 in wheelbase, and a 19.9 ft inside turning radius for maneuverability. Operating weight stands at approximately 26,147 lbs, accommodating oscillation at a 10-degree angle. The roller's advanced hydrostatic drive supports a maximum speed of 4.1 mph, ensuring reliability and efficiency in asphalt and soil compaction tasks. The articulated drivetrain and ergonomic design promote operator comfort and precise control in all job site conditions.