Noting the strong emphasis on jobsite and individual environments, manufacturers of 30-to-45-metric-ton excavators are highlighting cleaner engines, fuel economy and comfortable operator environments. Faster hydraulics, simplified maintenance and new Tier 3 engines deliver a boost in productivity and lower daily costs. Ergonomically designed cabs and controls minimize operator fatigue. Here’s what’s new in this machine class.
Komatsu PC300HD-7
The base of the Komatsu PC300HD-7 is the rugged undercarriage of the PC400LC-7. “The configuration gives the PC300HD incredibly low ground pressure,” says Peter Robson, senior product manager, Komatsu. “It works well in soft underfoot conditions and gives you a stability advantage.”
The PC300HD has two boom mode settings: smooth mode and power mode add to machine’s stability, with 20-percent lift capacity. Pressing the machine’s Power Max button temporarily increases digging force by 8 percent.
Komatsu’s Komtrax system is standard on all Tier 3 excavators. Komtrax-equipped machines can send location, SMR and operation maps to a secure website using wireless technology. Machines can relay error codes, cautions, maintenance items and fuel levels.
Deere 350D LC
The John Deere 350D LC excavator retains many of its predecessor’s features. The D-Series’ faster hydraulic system boosts productivity by up to 8 percent, says Mark Wall, product manager for John Deere Construction. “Improved hydraulics ensure faster digging and more work per hour,” Wall says. “Drawbar pull, swing torque, lift capacity and arm force have improved significantly.”
More D-Series improvements include a redesigned cab with a fully adjustable suspension seat and extra legroom. Forty-seven percent more right-hand window glass and a larger roof-hatch area give the operator a full view of the entire work area. The monitor features easy-to-read gauges, warning lights and icons that provide operating information at a glance. Easy-to-navigate screens provide access to warning messages, attachment preferences and maintenance and service information.
The 350D LC John Deere PowerTech engine employs a four-valve design that enhances fuel economy. Lowered exhaust gas recirculation cools combustion by reducing oxygen without timing retard. The hydraulically driven cool-on-demand fan runs only as needed, reducing noise and operating costs.
