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.
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