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Caterpillar’s CatD Series Mini Hydraulic Excavators—models 303.5D CR, 304D CR, 305D CR and 305.5D CR—are powerful, versatile, compact-radius machines that work comfortably in confined spaces and build on the quality design and reliability of their C Series predecessors—303C CR, 303.5C CR, 304C CR and 305C CR. With model designations that closely reflect their operating weights (3.5 to 5.5 metric tons), the new machines feature enhanced stability for greater productivity, a redesigned work-tool coupler, load-sensing hydraulics, and engines that meet U.S. EPA Tier-4 Interim and E.U. Stage-3A emissions regulations.