Equipment World Digital Magazine
Issue link: http://read.dmtmag.com/i/506694
EquipmentWorld.com | May 2015 65 D oosan is continuing the introduction of its Tier 4 Final dash- 5 crawler excavator lineup, debuting fi ve models ranging from the 14-metric- ton DX140LC to the 23-metric-ton DX235LCR-5 reduced tail swing machine. One area of concentration for Doosan engineers in the dash-5 upgrade was the front work group, says Shane Reardon, Doosan's ex- cavator product specialist. "It's what really takes the abuse," he says. To beef up this area, Doosan installed what it calls ultra hard wear disks in the bucket pin area that will last around 7,000 hours, Reardon says. "Just unbolt six bolts on each side to replace it," he says. "It doesn't require reboring, or putting in new bushings. And the tighter things are in this area, the better your break- out force." Doosan also put solid cast sections at the end of the stick, the end of the boom, and the pin-on point on the boom cylinder. "We also have inter- nal gussets inside our boom at high stress points," Reardon adds. With horsepower ranging from 113 to 181, the excavators use both a diesel oxidation catalyst and SCR emissions aftertreatment system. The DX140LC-5, DX140LCR-5 and DX180LC-5 have Perkins engines; the two larger DX225LC-5 and DX235L- CR-5 models have Doosan engines. A sight gauge lets operators know the fl uid level of the DEF tank; topping off the DEF tank is recom- mended as part of regular fueling operations. DEF consumption on the machines averages around 5 percent of fuel consumption. Each new model features Doo- san's Smart Power Control, consist- ing of two systems – Variable Speed Control and Pump Torque Control – both designed to keep the machine productive in the Digging work mode while reducing fuel consump- tion. The Variable Speed Control reduces engine rpm during low workload requirements – such as the swing portion of the dig cycle – reducing the total energy needed and improving fuel effi ciency up to 7 percent. The Pump Torque Con- trol matches the hydraulic pump torque and engine response to work demands. product report | by Marcia Gruver Doyle | MGruver@randallreilly.com Doosan intros fi ve new crawler excavators