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Cat 775G Off-Highway Truck
May 30th, 2011
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Company: Caterpillar Inc
A combination of new drive train strategies and a 5 percent power increase over the previous model enable Caterpillar’s Cat 775G Off-Highway Truck — a 70-ton (63.5-tonne) payload class truck — to hold a higher gear when climbing 10 percent grades in most applications. Meeting US EPA Tie 4 Final emissions standards, a number of new components and control changes boost efficiency. A key is the next generation of Cat transmission controls, named Advanced Productivity Electronic Control Strategy. The system enhances productivity, fuel efficiency and drive train durability, and it enables enhanced machine control. For example, to balance fuel savings and production, two different economy shift mode selections enable the customer to tailor performance to the needs of the business. Advanced control systems also integrate the optional engine compression brake with Automatic Retarder Control to enable faster downhill travel and reduced cycle times?without increased fuel consumption.
To meet Tier 4 Final emissions regulations in the USA, the Cat C27 ACERT™ engine includes the Cat NOx Reduction System and Diesel Oxidation Catalyst. Working in combination with ACERT technology, the Cat NOx-Reduction System continually diverts and cools a small volume of the engine exhaust gases, then returns the cooled gases to the combustion chamber. This process reduces cylinder temperatures and, consequently, lowers NOx formation. The no-maintenance Diesel Oxidation Catalyst reduces certain hydrocarbons in the exhaust.
The system requires the use of ultra low sulfur diesel fuel and does not use a diesel particulate filter. In the European Union and other areas, the 775G will be configured to meet EU Stage II emissions standards, which is the EU regulation applicable to the power output of the engine.
The 775G engine produces net power of 779 hp (581 kW), and target gross weight of the truck is 246,500 lb (111 811 kg). As with the previous model, a number of different body options enable a customer to configure a truck to achieve optimum capacity and durability. The 775G will replace the 775F when it goes into commercial production in the fourth quarter of 2011.
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