The rated payload for the new Cat 777G is 89.4 tonnes, with a standard-body volume. Cat says the design of the 777G, which replaces the 777F, focuses on fuel efficiency, enhanced visibility, and operator comfort, convenience and safety.

The new vehicle’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 forwarding gear to avoid stalling the torque converter and increasing engine speed. Engine Idle Shutdown, an operator-selected feature, is designed to stop the engine when the truck idles in the park for more than a preset interval.

Speed Limiting provides an alternative to gear-limiting the 777G by allowing the truck to travel at 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.

The 777G has two operating modes, Standard Economy and Adaptive Economy. Standard Economy saves fuel by reducing engine power by 0.5 to 15%, based on the fleet and economic conditions at a particular site. Adaptive Economy requires a production baseline for the site using the Advisor display, and then, as the truck travels the haul cycle, the system automatically evaluates the power rating needed to meet baseline requirements. Full power is applied when needed, and reduced power is applied when appropriate. The efficiency of the 777G’s performance is further enhanced by 7% more engine torque and an increase in top speed.

The 777G features a redesigned cab which is intended to be easier to enter and exit, with a new operator seat on the left and a more comfortable trainer seat on the right. There is a new console with an integrated hoist-and-shift lever enhances convenience and more interior space for storage. The truck’s design also emphasises improved visibility, to both the work area and instrumentation, and overall visibility is further enhanced with an optional object-detection system. Convenience items include a powered left window, automatic temperature control, throttle lock for long uphill grades, and reduced interior sound (by 50%, compared with predecessor models).

To improve operator safety in the 777G, roll-over and falling-object protective structures are integrated into the cab’s design. Laminated glass is used in the front and left windows, and emergency egress is provided via a right-side hinged window. A ground-level engine-shutdown switch is readily accessible, and a secondary steering system is provided in the event of the primary steering system failure.