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The Caterpillar 559 track-mount knuckleboom loader has a 163-gross-horsepower engine and a 32,200-pound operating weight. It has an open-center “Negicon” 246 liters/minute piston-pump hydraulic sysem. Options include bar slasher, circle saw slasher, delimber, carrier and grapple saw. The 559 also has a 1,400-pound counterweight. The knuckleboom is 32-feet long and it has a 51-foot swing-bearing diameter.