Hamm HP Series pneumatic-tire rollers have upgraded operator’s platform, water-and-additive sprinkling system, and ballasting system. The series has a common platform for all model variants, including HP 180/HP 180i models with operating weights of 8 tons to a maximum of 18 tons; and HP 280/HP 280i models with operating weights between 10 and 28 tons.
Operator's platform provides visibility over the machine and the work site. All models comply with the ISO 5006-2017 operator’s field of view standard. The HP Series has a minimal number of switches on the operator’s platform, and operator guidance is assisted by color-coded groupings. Drive control is via joystick positioned on the armrest. The brake pedal is an integral part of the seat-operating unit, making the pedal accessible, irrespective of seat position.
The new machines incorporate the Hamm asymmetrical-frame concept, which provides track offset between the front and rear wheel sets, allowing a clear view of the outer flanks of the front and rear wheels. Ballasting flexibility is also a feature of the new machines, allowing operating weight to be quickly adjusted to suit the asphalt type, layer thickness, and application. Prefabricated ballast bodies made of steel or concrete can be inserted into or removed from the large ballast compartments between the wheel sets.
A redesigned water tank is sized for a full working day without stopping to refill. A supplemental water tank with a volume of 1,500 liters is available and can be used as a water reservoir for the sprinkling system, or as a flexible supplemental weight, says Hamm. The supplemental tank is connected to the basic water tank by means of interconnecting pipes. To facilitate fast refilling, a C-pipe connection complements conventional filling, allowing the entire tank to be filled in around three minutes.
The roller can handle special asphalts that require spraying the roller’s pneumatic tires with an additive, which is stored in concentrated form in the additive tank and mixed with water as needed. The additive tank has a level monitoring system that is controlled from the operator's platform for various addition levels. The roller doses and mixes the additive during compaction in accordance with the specification.