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Dynapac USA has introduced four new models of their CA-series single drum vibratory rollers. The CA5000, CA5500, CA6000 and CA6500 have been equipped with a number of enhancements over previous models, including optimized drum amplitude, Automatic Bouncing Control and an overall design that makes it easier to service the equipment. Compaction is delivered by the new models utilizing drum amplitude of .083 inch (2.1 mm.) This increased force allows rock fill to be compacted in layers almost 9 feet thick with rock sizes up to 3 feet in diameter. It also requires fewer passes to reach compaction specifications.Automatic Bouncing Control measures feedback from the drum and eliminates drum bouncing, or over compacting. This new feature improves compaction performance while extending the useful life of the equipment by eliminating drum double-jump, which could lead to premature failure of machine components. The CA6000D model also features a governor to avoid compacting at a too high a speed.