Medium & Large Excavators: Equipment Spotlight

November 2011, Vol. 66 No. 11
John Deere's 350G LC.

Komatsu America
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The PC390LC-10 hydraulic excavator with a flywheel horsepower of 257 hp, is powered by a Komatsu SAA6D114E-5 engine and is EPA Tier 4 Interim/EU Stage 3B emissions certified. With an operating weight of 89,072 pounds (40,402 kg), the PC390LC-10 features improved hydraulic efficiency, improved operator comfort, simplified maintenance to extend component life, and a large undercarriage design that significantly increases lift capacity. The excavator is equipped with the latest KOMTRAX technology which sends machine operating information to a secure website utilizing wireless technology. Data such as operating hours, location, cautions and maintenance alerts are relayed to the web application for analysis. The PC390LC-10 features a large undercarriage design that uses components from the larger size class PC450LC-8 undercarriage. The ROPS certified cab is specifically designed for hydraulic excavators and gains strength from a reinforced pipe-structured framework. The cab is mounted on viscous damper mounts, which provide low vibration levels. The high-back, fully adjustable seat uses air suspension and is heated for improved comfort. 866.513.5778, komatsuamerica.com

Caterpillar
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The new Cat 374D hydraulic excavator replaces the model 365C. The fuel efficient 374D weighs 156,819 pounds and is designed for reliable, low-cost operation and long-life durability for optimum customer value. Rated at 476 net hp, the Tier 3/Stage IIIA-compliant Cat C15 engine provides 18 percent more power than its predecessor. The C15 torque enables the engine to deliver full power at maximum rpm, resulting in efficient hydraulic pump operation and enhanced hydraulic response. In addition, the new titanium-alloy compressor wheel in the turbocharger increases reliability and performance at higher altitudes. The 374D implement hydraulic system features a 10-percent increase in flow and a 9-percent gain in main pressure, resulting in a significant boost in hydraulic horsepower. The added hydraulic power combines with larger digging arm and bucket cylinders to yield 17 percent higher digging arm forces and 12 percent higher bucket forces on machines with the standard (reach) boom and arm configuration. For units in the mass excavation configuration, digging arm forces also are up by 17 percent and bucket forces by 5 percent. The net result is shorter cycle times and increased bucket fill factors. cat.com