Komatsu America Corp. recently unveiled a pair of new earthmoving machines—a mining-class bulldozer and a quarry-class wheel loader—both of which offer a number of performance improvements over previous versions. The company’s new D375A-6 crawler dozer, weighing 157,940 lb and powered by a Komatsu SAA6D170E-5 diesel rated at 636 gross hp, has been designed to compete for market share against Caterpillar’s D10T. The D375A-6’s more powerful engine, offering an 85 net hp increase over the previous D375A-5E0 model, is the same unit used in Komatsu’s PC 1250LC-8 hydraulic excavator (rated at 672 hp) and in the HD465-7 rigid body hauler truck (rated at 715 hp). According to Komatsu, an updated full-U 28.8-yd3 blade on the D375A-6 allows for increased production without increasing blade width or reducing digging force; the shape of the blade is similar to the next-size-class-larger Komatsu dozer, the D475A-5EO. Komatsu says the new dozer includes 16 new standard mining features including high-mounted head lights; battery and starter isolator box; centralized grease points; and manual engine stop switches. Optional mining features include right and left hand platforms with handrails and HID work lights.

In addition to the new dozer, Komastsu added the WA480-6 wheel loader to its product line. The 299-hp machine has an operating weight of 55,920 to 56,340 lb and a dumping clearance of 10 ft 6 in. when equipped with a 6-yd3 general purpose bucket. According to the company, the WA480-6 has a newly designed Large Capacity Torque Converter that provides the machine with excellent tractive effort, improved acceleration and improved hill climbing ability. The loader is powered by a Komatsu SAA6D125E-5 diesel engine with an Electronic Heavy Duty Common Rail fuel injection system and is EPA Tier 3 emission certified. The machine is fitted with Komatsu’s EMMS (Equipment Management Monitoring System), allowing the operator to stay informed of all machine functions on the easy-to-read monitor. An automatic transmission with Electronically Controlled Modulation Valve makes operating functions easier; for example, with the touch of a finger, a kick-down switch automatically downshifts from second to first when beginning the digging cycle; in reverse, it automatically up shifts from first to second. Conversely, a hold switch keeps the transmission in either third of fourth gear speed when auto shift is selected.

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