Equipment World Digital Magazine
Issue link: http://read.dmtmag.com/i/917937
EquipmentWorld.com | December 2017 21 The HPU8 electro-hydraulic pump was specifically developed by Wacker Neuson to ensure that the compact excavator delivers compa- rable performance whether operat- ing by diesel engine or electrical power. The HPU8 is connected to the 803 by 39-foot hoses, allowing the excavator to still rotate 360 degrees. Doosan offers two compact excavators. The 58.6-net-horsepower DX63-3 is a conventional tailswing machine weighing 6.3 metric tons. The reduced-tailswing DX85R-3 shares the 58.6-horsepower rating and weighs 8.6 metric tons. Doosan says the DX63-3 ranks best-in-class for over-the-side lifting performance. or other obstacles, and Case C Series models all have adjustable booms. Case's smallest model, the CX17C, sports another popu- lar feature, a variable-width undercarriage (3 feet, 3 inches retracted; 4 feet, 3 inches ex- tended) and adjustable blade. This allows the machine to fit through a standard 36-inch gate while providing maximum stability once in position. Land- scapers and others working in developed environments place priority on this feature. Dave Young, excavator prod- uct marketing manager with John Deere and Hitachi, notes that the new Hitachi ZX30 and Deere 30G compact excavators have the same undercarriages as their bigger siblings, the ZX35 and 35G, respectively. One obvi- ous benefit is a reduction in production costs, but the choice also provides greater stabil- ity to the new models. Despite the beefier undercarriage, the new models weigh only 7,200 pounds when equipped with cabs and rubber tracks, so they can be trailered with a three- quarter-ton pickup. All compact excavators have engines of less than 75 horse- power. Although engines below 75 horsepower have simpler emissions control systems than those of higher output, they're still not one size fits all, says Andrew Earing, utility line excavator product manager with Komatsu. The company's PC30MR-5 and PC35MR-5 rely on cooled exhaust gas recircula- tion (CEGR). The PC45MR-5 and PC55MR-5 have CEGR plus a small Komatsu diesel oxidative catalyst. The PC78US-10 and PC- 88MR-10 use those elements and a variable turbocharger. "The means of compliance changes to reflect the differences in fuel consumption," says Earing. Earing says Komatsu offers three track types. The traditional rubber belt track is good for general excavation and land- scaping. A hard rubber road track is available for urban and other developed environments to minimize damage to finished surfaces. And steel grousers are available for rocky conditions. A two-way blade is standard on all six models, while a four-way blade is optional.