At bauma 2022, Hamm is introducing the HX series to the market with the HX 70i and HX 90i models.

With the HX series, Hamm, a specialist in rollers and soil compactors for the road construction and earthwork sectors, is launching a new generation of pivot-steered tandem rollers on the market at bauma 2022, which opens in Munich, Germany, this October (24 to 30).

A highlight of the series is Smart Compact, Hamm’s newly developed digital compaction assistant. Furthermore, many components and interfaces have been further optimised with a view to improving operator comfort and sustainability. Also, all models meet the EPA Tier 4/EU Stage V emissions regulation.

“The HX series, the new flagship in the Hamm fleet for asphalt construction, is designed for high-quality compaction,” says a spokesman for the company, which is part of the Germany-headquartered Wirtgen Group. “The HX 70i model (7 tonne/55.4 kW) and HX 90i (9 tonne/74.4 kW) achieve high surface outputs on large construction sites, but also impress in the most challenging tasks, such as compaction in curves. The high level of precision is possible thanks to pivot steering with an extremely large turning angle, a very large track offset and four steering modes.”

The well-conceived compaction technology with split vibration and oscillation drums actively prevents cracks and bulges from forming in the asphalt, he says.

“The automatic reversing with the electrically adjustable seat operating unit also guarantees quality and comfort. It brakes and accelerates the rollers quickly, but smoothly. The seat also turns automatically in the direction of travel when reversing. This is unique in the market. It produces first-class surfaces and ensures ergonomic operation with top safety,” the spokesman adds.


Smart Compact, a digital compaction assistant.

Smart Compact, a digital compaction assistant.

Smart Compact

On request, Hamm equips the rollers in the HX series with Smart Compact, which actively supports the driver and is easy to operate. This compaction assistant combines the simple operation with handling via smartphones, computers and other digitally controlled devices. It, therefore, meets the changed personnel requirements at modern workstations in road construction.

“The automatic mechanism sets compaction parameters for each drum. The driver then only has to enter whether a base-, binder or asphalt surface course is to be compacted. The Smart Compact takes care of the rest: The assistant decides automatically whether to compact with vibration and big or small amplitude, with oscillation, or statically. To this end, it evaluates physical properties of the asphalt, such as the temperature or rigidity,” the spokesman says.

New features include the integration of local weather data via an integrated weather station and the assessment of the complex cooling behaviour in the area of tension between the asphalt and air temperature, as well as the wind. Based on all of this information, the system determines the right setting separately for both drums.

“This means that Hamm is the first manufacturer in the world to automate the separate setting of the individual drums and is therefore raising the quality of the compaction to a whole new level,” he remarks.

Smart Compact detects when an asphalt layer is almost completely compacted. The system then automatically cancels the dynamic compaction and puts the roller into ECO mode. As a result, the engine speed is reduced by up to 20 per cent, which also means that up to 15 per cent fuel can be saved. Smart Compact, therefore, not only increases the compaction quality, it also conserves the machine and resources.

The bottom line is that Smart Compact increases the process reliability and, in turn, the quality of the compaction and the surfaces. The simplicity of the assistant here is captivating. It is operated via a separate display. The user guidance is clearly designed, meaning that the personnel can fully concentrate on driving the machine.

The HX series looks different from its predecessor DV+ series thanks to newly designed lights and sheet-metal brackets, as well as details around the cab. In the cab, the unobstructed view to the rear left has been further improved. The new camera system with robust monitors (IP 66), which is integrated as standard, also further improves the view into the rear space.