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These Volvo large soil compactors all offer compaction widths of 66 inches (1676 millimeters). Smooth drum models have operating weights of 15,750 pounds (7143 kilograms) on the SD70D, and 16,350 pounds (7415 kilograms) on the S77DX. The SD77F padfoot model weighs 17,780 pounds (8063 kilograms) and compacts cohesive type materials. The drums on the SD77DX and the SD77F offer five different frequency settings that range from 1,850 to 2,025 vibrations per minute (30.8 to 33.8 hertz). The SD70D employs a dual-frequency setting, but the five frequency settings are available as an option. A 99-horsepower (73.8-kilowatt), four-cylinder, turbocharged Cummins diesel engine powers the SD70D, SD77DX and SD77F compactors. The SD77DA is powered by 95-horsepower (70.8 kilowatt) Cummins engine.