Heavyweight Bulldozer Models Feature Refined Design, High Fuel Efficiency
The Tier 4 Final configuration employs Cat's NOX Reduction System, which captures and cools a small volume of exhaust gas, then returns it to the combustion chambers to lower temperatures and retard formation of nitrogen oxides. In addition, a Diesel Oxidation Catalyst conditions exhaust gases to meet emission standards. A new cooling package uses a two-part radiator with aluminum bar-plate cores that contribute to durability, efficient heat transfer and corrosion resistance. The new oil-to-air hydraulic-oil cooler uses similar construction, and a hydraulic variable-demand fan uses less power, reduces fuel consumption and lowers sound levels.
New for the D11T and D11T CD is the Enhanced Auto Shift (EAS) system, designed to conserve fuel by automatically selecting the optimal reverse gear and engine speed, based on load and desired ground speed. When EAS is not activated, an Auto Downshift feature automatically changes gears to most efficiently handle loads. Inside the cab, a Dynamic Inclination Monitor provides a readout of tractor pitch angle and side-to-side slope angle, and Automated Blade Assist Control uses preset blade-pitch positions to simplify positioning. An optional Autocarry system automatically controls the blade during the carry segment. A new operator-presence system locks out the power train and hydraulic system to avoid unintentional machine movement when the operator is entering or leaving the cab, which can be done via an optional hydraulically actuated access ladder that deploys and stores in seconds.
The D11T and D11T CD feature an "OK-to-Start" system that electronically checks critical fluid levels. Routine maintenance is facilitated by easily accessible filters, an optional automatic lubrication system, high-speed oil change for engine and power train systems, and ecology drains for capturing fluids for proper disposal or recycling. A fast-fill fueling system incorporates a positive shutoff to prevent spills.