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The Caterpillar D-Series wheel excavators, M313D, M315D, M316D, M318D and M322D, deliver increased lift capacity and faster cycle times through changes in engines and hydraulics as compared to the C-Series machines they replace. The D-Series also features expanded versatility and enhanced operator control as well as fuel efficiency that is 7 to 8 percent greater than the previous models. Each of the D-Series machines has greater drawbar pull, increased bucket and stick force, greater dig depth and longer reach than the equivalent C-Series machine. The D-Series wheel excavators range in size from 127 net horsepower and operating weight of about 31,000 pounds to 166 net horsepower and operating weight of about 48,000 pounds.