Dynapac is offering four new tandem rollers aimed at asphalt compaction duties that extends its range in the 7-13tonne class to eight models in all. These machines have been developed to provide a high quality surface finish, while being efficient to run with low maintenance needs and easy servicing.
There are two new machines for the 7-8tonne class with the CC224HF tandem asphalt roller and the CC234HF split-drum version. There are also two machines for the 8-9tonne class with the standard tandem CC324HF and the CC334HF split drum version. According to Dynapac, these four machines have all been designed to meet the needs of contractors and rental companies worldwide.
Important features include soft starting and stopping functions that help prevent bowing or cracking in the asphalt layers and the firm says that these allow unskilled roller operators to start and stop without leaving marks. If the lever is moved quickly, signalling the need for an emergency stop, the machine will drop out of its soft mode and brake immediately as a safety feature.
Servicing is quicker and easier than on earlier machines so as to ensure greater uptime and the four rollers come with a double pump vibration system, which eliminates the need for a vibration valve, increases efficiency, cuts servicing and helps reduce fuel consumption. Power comes from a Tier 3/Stage IIIA emission compliant
The design of the cab is said to ensure that operators have good visibility of the working area as well as good access to the controls. Safety is claimed as the machines feature 1x1m visibility (a 1m high object can be seen 1m away from each machine) and offer a good view over the drum surfaces, drum edge and sprinkler nozzles.
Because the engine is now mounted on the rear chassis, noise and vibration levels have been reduced for the operator while any heat generated by the engine is also at a distance from the operator's platform. Moving the power unit to the rear chassis has also helped maintenance access, with service technicians able to reach the engine and hydraulics through the access covers.
Driveline improvements and other upgrades are said to increase efficiency while maintaining or even increasing productivity over other machines in this size class. The firm claims that increased efficiency has saved some 8kW, with reductions in running costs and noise as a result.
Effective compaction is claimed for machines specified with the optional Dynapac Compaction Analyser for Asphalt (DCA-A), which is said to provide accurate information about the work being carried out. This system allows the next pass to be planned, takes into account the asphalt temperature of each area and tracks the number of passes, making it easy for the operator to maintain control of the pattern and achieve the best results. Better planning of the rolling operation also ensures jobs are carried out more efficiently, reducing fuel consumption. Further information can be provided through the optional Dynapac Compaction Analyser software, which indicates the temperature in front of and behind the roller as well as the number of passes made on each section of the asphalt for more efficient compaction.
