September 1, 2010
Digging with the Big Boys
By Kerry Clines, Senior Editor
This selection of 70-ton and larger excavators can help increase the production level at any quarry.
These excavators feature cab improvements — more space, better visibility, increased safety, and reduced vibration — for increased workability.
The 70-ton Volvo EC700C has a Tier III-compliant engine with Volvo Advanced Combustion Technology for high torque at low revolutions. The machine boasts a hydraulic system with high breakout force, and a robust undercarriage and reinforced superstructure and boom/arm for greater endurance.
John Deere’s 850D LC offers fast hydraulics, powerful swing torque, and generous drawbar pull. Its Powerwise III management system balances engine and hydraulic performance. The company says its generous hydraulic flow and best-in-class metering ensure powerful digging force, precise low-effort control, and multifunctional operation.
The 181,880-pound R800LC-7A is the largest in Hyundai’s family of excavators. A lighting package — boom-mounted work lights and lighting built into the frame of the cab’s roof — make nighttime work easy. Maintenance and service is fast and easy with a centralized lube bank, wide-opening access door, and easy-to-reach filters.
Kobelco says its SK850LC Super ACERA provides competitive breakout, drawbar pull, and swing torque forces. The unit is designed for easy transport — it can be configured four different ways to meet various local requirements. A centrally located catwalk and walking platform provide easy access for routine maintenance checks.
Hitachi’s EX1200-6 comes with a front-shovel bucket range of 7.7 to 8.5 cubic yards, which matches well with 65-ton class trucks. An air-ride seat and improved joystick controls provide better ergonomics. Other features include improvements to the undercarriage and upper structure.
The Link-Belt 700 X2 has an operating weight of 153,442 pounds with a maximum digging depth of 27 feet, 7 inches and a digging reach of 43 feet, 2 inches. The machine boasts precise and aggressive performance, as well as increased fuel efficiency.
Increased fuel efficiency, more horsepower, and improved hydraulics add up to greater production with these excavators.
Liebherr’s R 964 C Litronic offers a 29-foot, 10-inch digging depth; 75,400-pound breakout force; an operating weight of 150,790 pounds; and a lift capacity of 25 feet over end and side. Liebherr Tool Control allows operators to easily change hydraulic tools and adjust pressure and flow rates.
Caterpillar’s 156,043-pound 374D improvements include new buckets and a greater operating weight to boost loading and lifting capabilities, a stronger undercarriage, safety enhancements, and easier serviceability. The Cat C15 ACERT engine features electronic control, precise fuel delivery, and refined air management.
Komatsu says its PC800LC-8 Super Digger uses double-arm cylinders and an HD bucket cylinder to increase arm digging force by 19 percent and bucket digging force by 9 percent over a standard machine — without sacrificing working range. The machine also features the Komtrax satellite monitoring system and on-board diagnostics.
Case says its CX800B is ideally suited for applications requiring heavy muscle and long reach. The 178,575-pound machine features an electronically controlled, common rail, 15.7L Isuzu engine and is available in standard and mass-excavation configurations.
Coming soon to a dealer near you! This crawler excavator is being put to the test at a quarry in Georgia.
Doosan’s soon-to-be-debuted DX700LC features a six-cylinder, 463-horsepower turbo-charged Isuzu diesel engine and an operating weight of 158,953 pounds with standard boom and arm, 35.4-inch double grouser shoes, and 4.32-cubic yard bucket. Standard bucket breakout force is 78,485 pounds; arm breakout force is 78,044 pounds. Maximum digging reach is 40 feet, 10 inches at ground level; maximum digging depth is 25 feet, 4 inches. Dump height is 27 feet. Optional buckets range from 3.27 to 5.89 cubic yards.