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The 621 model trommel from McCloskey International has been updated to provide ground-level access to the common service points for equipment technicians, allowing faster, simpler maintenance and improved safety on the worksite. The new 621 trommel implements design innovations developed by McCloskey engineering for the 733 4×4 trommel last year. While the 621 model is one of the most popular high-production wheel-drive trommels, featuring the patented McCloskey Drum X-Change System, the 733 model was introduced in 2007 as the world’s largest wheel-drive units. The Drum X-Change System replaces traditional chain drives with a trunnion-based wheel drive, allowing operators to simply lift out one drum and drop in another to change screens. Eliminating the chain drive also eliminates the most costly service item from the trommel maintenance schedules.