Hamm’s next generation of pneumatic tire rollers

pneumatic tire roller

In the 1960s, Hamm launched the GRW. The pneumatic tire rollers were revolutionary at that time, and Hamm has continued to develop these machines up to the present day. 

Now, more than 50 years later, the compaction specialists from Bavaria are launching a new generation of the pneumatic tire rollers: the HP series. 

The new series will replace the existing GRW series worldwide by the end of this year.

One platform 

For the HP series machines, Hamm has developed a common platform for all models in every market throughout the world. 

Hamm will also continue producing the pneumatic tire rollers in different basic version. 

First, there are the HP 180 and HP 180i models with operating weights of 8 tonnes to a maximum of 18 tonnes. Second, there are the HP 280 and HP 280i models with operating weights between 10 tonnes and a maximum of 28 tonnes. Here, Hamm is providing the individual markets with models to suit the locally relevant weight classes and equipment variants. 

The new HP series pneumatic tire rollers also offer a modern, spacious operator’s platform or panoramic cabin with maximum visibility over the machine and the construction site. I

n this respect, all models comply with the new ISO 5006-2017 operator’s field of view standard which is stricter than the previous provisions. In terms of machine design, Hamm is sticking with the proven asymmetrical frame concept in the HP series. The frame follows the track offset between the front and rear wheel sets and always allows a clear view of the outer flanks of the front and rear wheels.

Clear operating concept

On all models, the operation is designed to be language-neutral and easy to learn. The minimal number of switches on the operator’s platform is intelligently arranged. As well, user guidance is assisted by the unambiguous colour-coded grouping. Drive control is ergonomically positioned on the armrest via a joystick. 

Another feature is the flexibility in terms of ballasting: the operating weight is quickly adjustable to suit the asphalt type, layer thickness and application. 

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The HP series offers considerable latitude with its variable ballasting concept. For example, prefabricated ballast bodies made of steel or normal or heavyweight concrete can be inserted into, or removed, from the large ballast compartments between the wheel sets using a fork-lift truck, for example.

This can be carried out in the user’s workshop or on the construction site. Hamm offers various ballast body kits for this purpose allowing different weights to be achieved. With ballast spaces located in the centre of the machine, the weight is always evenly distributed over both axles.

Large tank volumes

The new HP series pneumatic tire rollers are identifiable by their large, newly designed water tank. Like the diesel tank, the water tank features ample capacity, so that the machines have sufficient capacity for a full working day without stopping to refill. 

Hamm also offers a supplementary water tank with a volume of 1,500 litres for all HP series models. It may be used as a water reservoir for the sprinkling system, but also serves as a flexible supplementary weight. Operation of the supplementary tank is easy as it is connected to the basic water tank by means of interconnecting pipes. To facilitate quick refilling, the developers have provided a C-pipe connection to complement conventional filling. It allows the entire tank to be filled in about three minutes. A pump is also fitted to allow complete discharge.

Innovative sprinkling system

Hamm has also optimized the additive sprinkler system for the new HP series pneumatic tire rollers due to the profusion of special asphalts that tend to be difficult to process. High-quality compaction of these materials calls for sprinkling of the pneumatic tires with an additive.

Previously, the additive concentrate was mixed with water and then filled into a separate tank on the roller. On the new machines, the additive concentrate is simply filled without premixing. 

The dosage from the large additive tank with level monitoring can be controlled from the operator’s platform in various addition levels.

The pneumatic tire roller doses and mixes the additive during the compaction in accordance with the specification. This also brings about an increase in quality, as Hamm avoids separation of the additive-water mixture by virtue of the design. Switching from water to additive can be done at any time directly from the operator’s platform.

Safety assured maintenance

When it comes to maintenance, Hamm’s engineers also paid attention to efficiency and safety. For example, all daily maintenance items are situated on the right-hand side of the engine. Engine access has also been designed with safety in mind on the HP series: the steps are integrated in the outer contour and are opened outwards in one easy operation. As they visually protrude in this position, the operator cannot forget to retract the steps.