“Unfortunately, our industry is probably labeled as anything but green. Plote and others think it would do some good. With a powerful diesel engine ranging from 312 to 354 horsepower (hp), depending on the model, the D8 is a force to be reckoned with. The heart of the D8 Bulldozer is its robust engine, which is like the big friendly giant of the construction site. When the concept was shown at CONEXPO 2008 in Las Vegas, Cat did not want to label it a hybrid because it does not store power onboard. Dozer Engine Performance and Fuel Efficiency. The machine is a breakthrough, but Cat may have missed an important opportunity to toot its horn over going green. ENR found the D7E easier to control and quieter than the D7R, in part due to the engine’s narrow operating rpm. “It is amazingly keeping up, pound for pound…and the fuel economy is incredible,” he says. says the D7E his firm is trying out is as handy as one of its D8Ts. Plote of Hoffman Estates, Ill.-based Plote Construction Inc. Cat says it is considering hybrids for other machines.Įarly reviews are glowing. The powertrain setup enables the sprockets to perform tighter, locked-track turns. “Caterpillar is not getting away from the elevated sprocket,” Nicoll explains, adding that larger machines will keep it.
Taking away the trademark “high- drive” elevated sprocket was a tough decision, even requiring input from the chief executive’s office. The D7R will be available through mid-2010. Initially, the D7E will be sold in North America, Europe and Japan. In the D7-size range, only 300 were sold, but buyers worldwide took 4,000. Last year, manufacturers sold about 2,000 D6-sized tractors in North America and 700 D8s, it says. The midsize dozer is not a high- volume seller in North America, but Cat hopes to change that with the D7E’s power and fuel economy. Electric motors replace a torque converter, effectively turning the transmission into a set of power cables.
#D8 dozer feul efficiancy series
Cat measures fuel efficiency in terms of material moved per gallon of fuel. 1955: 1H Series D8 ends production 191 hp (142 kW) D8E and D8D introduced with new 1,246-cubic-inch (20,420 cc) displacement (CID) D342 diesel engine. Overall, the D7E is up to 25% more fuel efficient than the D7R. “It means the accountants are happy,” Nicoll says. Though such a high price premium is unusual for construction machinery, Cat still expects the D7E to save users money in owning-and-operating costs and provide a payback primarily in fuel but also productivity, maintenance and other efficiencies of the hybrid drive. But as emissions and energy concerns rose, the D7E’s cleaner, greener, diesel-electric drive took on even greater significance. Cat started work on the machine in the late 1990s to create a more efficient tractor with big-dozer power.
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