The pneumatic-tyre rollers from Hamm HP series have been on the market across the world. They are equipped with a large, newly designed water tank (650 l) so that the machines have sufficient capacity for a full working day without the need to refill.
There are different models to suit regional demands, which include the HP 180 or HP 180i with a minimum working weight of 8 t and maximum operating weight of 18 t, plus the HP 280 or HP 280i with working weights ranging from 10 to 28 t.
The HP 180i and HP 280i models (both with Easy Drive operating concept) comply with the EPA Tier 4 and EU Stage V emissions standards, while the HP 180 and HP 280 models are designed for Tier 3 markets.
The HP pneumatic-tyre rollers feature a simple and intuitive operation, along with an ergonomically optimised driver’s platform. When combined with the shape of the asymmetrical frame, this results in excellent visibility – for models with a cab as well as those with ROPS.
The machines’ hydrostatic rear-axle drive, coupled with a sensitive control system, allows the right speed to be set in every working situation. The specified working speed can be easily adjusted using the rotary knob here – an important prerequisite for homogeneous compaction. The intelligent drive control enables smooth, even acceleration and braking, thus preventing uneven compaction.
A variety of options
For the HP series, Hamm offers a wide range of options, making the machines adaptable to each individual market and application. The thermal aprons have always been a classic piece of equipment for the pneumatic-tyre rollers, and they are available for all models in the HP series.
The diesel-powered tyre heating is a new feature for the HP 180i and HP 280i models. According to Hamm, the integrated tyre heating is not operated using gas, but rather with diesel from the fuel tank. This means that the often costly transport and the time-intensive replacement of the cylinders can be avoided. With such solution, the manufacturer has also eliminated a source of danger because there are no naked flames and, as a result, no risk of ignition, when it comes into contact with oil or the additive, for example.
Another permanent feature of the new tyre heating is an automatic temperature control. After preselecting a minimum and maximum value, the control maintains the temperature in this range. The driver can view the current temperature via the display. The tyre heating also does not affect the ballasting of the machines. The maximum permissible operating weight can be achieved, irrespective of this.
Innovative additive-sprinkling system
When paving special asphalt that is quite difficult to process, the sprinkling of the pneumatic tyres with additive is essential for high-quality compaction, explained Hamm. By completely redesigning the additive-sprinkling system, the manufacturer is creating optimal prerequisites for easy handling and the highest level of compaction quality.
The system provides several advantages. One of the highlights is the time-saving filling of the additive concentrate, whereby no premixing is required. The dosage can then be regulated in different levels from the driver’s platform. The water and additive are mixed automatically, which guarantees a lasting optimal mixing ratio without demixing. The driver always has the option to monitor the fill level via the display on the control panel. Hamm said it is also possible to convert the sprinkling from water to additive at any time from the driver’s platform.