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Three D-Series mini hydraulic excavators join the Caterpillar line. The 307D is a direct replacement for the 307C. The 308D CR, a compact radius machine that works productively in tight spaces, replaces the 308C CR. A new model, the 308D CR SB, combines the compact radius design with a swing boom for even more versatility. The D-Series mini excavators retain the best features of the C-Series models while incorporating many improvements that increase productivity and reduce operating costs. The new mini excavators outperform their predecessors with 22 percent higher bucket forces and 10 percent higher stick forces. Lift capacity has been increased with the addition of a larger counterweight. A 15 percent increase in traction forces improves dozing and turning performance. Each machine is powered by a new turbocharged Mitsubishi 4M40 TL engine, rated at 54 net horsepower (40 kilowatts). The engine is reliable, durable, fuel efficient and meets Interim Tier 4 emissions regulations.