637K Wheel Tractor-Scraper Flywheel Power - Tractor/Scraper 570 HP Scraper Capacity - Heaped 34 yd³ Top Speed - Loaded 34.7 mile/h View Full Specs 657 Wheel Tractor-Scraper Flywheel Power - Tractor/Scraper 469kW (629 hp) / 353 kW (473 hp) Tractor Engine Cat C18 Scraper Capacity - Heaped 44 yd³ View Full Specs 621K Wheel Tractor-Scraper Flywheel Power - Tractor/Scraper 304 kW (407 hp) Scraper Capacity - Heaped 24 yd³ Top Speed - Loaded 33.5 mile/h View Full Specs 631K Wheel Tractor-Scraper Flywheel Power - Tractor/Scraper 570 HP Scraper Capacity - Heaped 34 yd³ Top Speed - Loaded 34.7 mile/h View Full Specs
