Caterpillar's 770 and 772F rigid-body haul trucks are designed for applications in the 40-ton and 50-ton payload classes, respectively. Introduction of these units, both of which feature a new engine and radiator, enhanced transmission and brakes, and a new cab and operator station, allows Cat to discontinue its existing 769 and 771 models.

The 770 is powered by Cat's C15 engine, which produces 476 net hp; while the 772F has a C18 engine rated at 535 net hp. According to the company, both engines meet EPA Tier-3 and EU Stage-IIIa requirements and deliver improved fuel economy compared with the previous engine used in this size class. Engine service interval for each truck is 500 hours — twice that of previous truck models. Cat's QuickEvac on-board engine oil evacuation and pre-lube system, now standard equipment on these trucks, reduces oil-change labor time by 50%.

On both models, a seven-speed power-shift transmission is integrated with new transmission chassis-control electronics for improved performance, while a new differential design reportedly extends durability. Automatic retarder control (ARC) is now standard to protect the engine from overspeeding, improve fuel efficiency and provide better overall control of the truck. In addition to ARC, the compression brake option offers a 35% increase in retarding speed capabilities.

Vital machine information is available to the operator or technician through Cat Messenger, which provides real-time and stored machine performance and diagnostic data through an LCD display in the cab. With the optional truck payload management system (TPMS) attachment, Messenger also shows payload state, payload weight, loaded travel time, loaded travel distance and accumulated weight. TPMS now has second-gear weighing capability and 2,400-cycle storage for data analysis.

Caterpillar offers dual-slope and flat-floor body systems with three steel-liner packages and two rubber-liner packages on the 770 and 772. Five body-liner systems for the 770 and 772 enable customers to configure the trucks for a specific application.