The Cat^® 797F large mining truck is now available in a fuel-efficient configuration that meets U.S. EPA Tier 4 Final emissions standards. The 797F Tier 4 Final is equipped with an exhaust after treatment system featuring SCR, which uses diesel exhaust fluid (DEF) to lower NO_x emissions.  This Cat emissions platform is proven through more than 20 million operating hours in the field. To maintain superior reliability, the 797F after treatment system uses less than 11 percent new content. Designed for easy serviceability with readily accessible components, the modular after treatment system is aligned with truck preventive maintenance intervals to maintain high availability.

The 400 ton 797F is powered by the 4000 hp (2,983 kW) Cat^® C175-20 engine, available with optimized fuel maps for customers focused on the lowest fuel burn, Tier 2 equivalent rating, and now Tier 4 Final. Beyond offering similar performance, the Tier 4 Final 797F reduces total specific fluid consumption costs (fuel plus DEF) in most applications with lower fuel burn resulting in longer engine life and lower repair costs.

The Cat® 794 AC Mining Truck is now available equipped to meet U.S. EPA Tier 4 Final exhaust emissions standards. In field testing, the Tier 4 pilot trucks matched the superior performance and productivity of the Tier 2 equivalent versions of the 794 AC. The Tier 4 trucks also delivered lower operating costs by reducing diesel fuel consumption. The 320-ton class 794 AC features the Cat C175-16 diesel engine. The Tier 4 truck is also equipped with an exhaust after treatment system using SCR. 

The new Cat® 777G off highway truck builds on the legacy of performance, reliability and long term durability established by 777 models both in mining and large earthmoving applications. Rated payload for the new 777G is 98.4 tons, with a standard-body volume (SAE 2:1) of 83.8 cubic yards (64.1 m³). The design of the 777G, which replaces the 777F, focuses on fuel efficiency, enhanced visibility and operator comfort, convenience and safety. The new 777G’s Cat C32 ACERT™ engine meets US EPA Tier 4 Final as well as EU Stage V emission standards and is available in configurations to meet emission standards of less regulated (LRC) countries. The engine delivers 1,025 gross horsepower (765 kW) and incorporates a number of fuel conservation features.

Auto-neutral idle allows the 777G transmission to intermittently shift to neutral when the truck is idling in a forward gear to avoid stalling the torque converter and increasing engine speed. Engine-idle Shutdown — an operator selected feature — stops the engine when the truck idles in park for more than a preset interval. “Speed Limiting” provides an alternative to gear limiting the 777G by allowing the truck to travel at a more fuel-efficient engine speed and in a more efficient transmission gear. Advanced productivity electronic control strategy (APECS) transmission controls boost fuel efficiency by maintaining momentum and speed on uphill grades during shifts.