Poclain Best-In-Class MK12 Drive Dynapac's Groundbreaking CX9 Roller
For over 90 years, Dynapac has been at the forefront of innovation in compaction. The Swedish company introduced the world’s first self-propelled compactor in 1953 and are now onto their sixth generation. Today, the Karlskrona-based manufacturer boasts the most comprehensive range of compactors, assembling each model to order. In 2024 they launched the CX9, a pivot-steered asphalt roller integrating four MK12 motors for optimal power density and stability.
More Efficient Vibration
Dynapac’s CX9 is highly versatile. With a total length of 4.2 meters and an overall height under 3 meters, it weighs only 9 tons, making it easy to transfer on a trailer and ideal for city job sites. Its pivot-steer structure provides the highest offset on the market, up to 1.35 meters, enabling smooth compaction around tight bends.
The CX9 also features the latest version of Dynapac’s Seismic Asphalt technology, which mimics the natural behavior of the ground as it is compacted and continuously adjusts the vibration frequency. Combined with Dynapac’s revolutionary eccentric design, the Seismic Asphalt technology enables the machine to compact more efficiently and reduce the size of the engine and hydraulic components, as well as save on fuel, reduce noise and increase operator comfort.
Best-in-Class MK12 Motors to Drive the Drums
To power the CX9’s drums, Dynapac selected best-inclass drive motors that match the machine’s performance: MK12 motors by Poclain. Under 26 cm (10 in.) long, they feature a hollow shaft to pair up with the eccentric motor, making them the ideal solution for split drums.
Poclain is one of our long-standing suppliers, and we chose their motor technology for its smooth driving behavior, which is critical for tandem rollers.
The four motors are mounted in a parallel circuit with a four-way flow divider to ensure precise drum synchronization.
With its cutting-edge combination of intelligent software and high-performance components, the CX9 exemplifies Dynapac’s commitment to sustainability and operator well-being. Dynapac’s CX9 proves that even a time-honoured process like asphalt compaction can evolve to meet today’s sustainability demands.
An interview with Matthew BIELLER, Global Product Manager for Asphalt Rollers at DYNAPAC
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