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Caterpillar introduced three mid-sized hydraulic excavators, the 320D L with standard swing radius, 320D LRR with reduced swing radius and 321D LCR with compact radius. The excavators have about 7 percent more engine power and increased hydraulic pressure for increased breakout force, greater lift force and increased drawbar pull, compared to th C-Series machines they replace. The heavy lift circuit is now standard on D-Series models. At the touch of a switch, heavy lift boosts hydraulic pressure for increased lift performance.