Replacing the 657E, Caterpillar's 657G open-bowl scraper features Cat's C18 ACERT engine for the tractor and the C15 ACERT engine for the scraper. The largest of eight machines in the G Series wheel tractor-scrapers, the 657G has a heaped capacity of 44 cubic yards and a rated load of 104,058 pounds. Maximum travel speed is 36 mph. The radiator now has nine fins per inch (predecessor had 33 fins per inch) to increase space and reduce clogging. Cab improvements include a single-lever implement control that combines the bowl, apron and ejector controls into one joystick. Estimated list price: $650,000–$730,000.