The Biggest Diesel in Mining Is 106 Liters — And It Turns Just 1,750 Times a Minute

The Caterpillar 797F can haul 400 tons of material — and buried inside it is one of the most extreme diesel engines ever put in a mining truck.

The Cat C175-20 is a 106-liter, 20-cylinder, quad-turbo diesel producing around 4,000 horsepower at just 1,750 RPM. Among current ultra-class haul-truck diesels, it is the largest by displacement. But why build an engine this enormous and make it turn so slowly? :chatgpt-content-reference{index="0"}

In this video, we break down how the C175-20 creates sustained power, how the 797F’s torque converter, seven-speed transmission, differential and planetary final drives turn that power into enough force to move a truck weighing more than 600 tonnes fully loaded — and why low RPM matters in a machine expected to work shift after shift. :chatgpt-content-reference{index="1"}

We also look at the rival approaches from Cummins and MTU, the difference between mechanical and diesel-electric haul trucks, and why hybrid and battery-electric technology may eventually change how much diesel engine a mining truck actually needs. :chatgpt-content-reference{index="2"} :chatgpt-content-reference{index="3"}

This is the engineering story behind 106 liters, 4,000 horsepower, and only 1,750 RPM.
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