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 Scraper Capacity - Heaped 34 yd³ Top Speed - Loaded 34.7 mile/h Front of Tractor to Front Axle 142.2 in View Full Specs 637K Wheel Tractor – Coal Bowl Scraper Flywheel Power - Tractor/Scraper 425 kW (570 hp)/216 kW (290 hp) Scraper Capacity - Heaped 50 yd³ Top Speed - Loaded 34.7 mile/h View Full Specs 637K Wheel Tractor-Scraper Scraper Capacity - Heaped 34 yd³ Top Speed - Loaded 34.7 mile/h Front of Tractor to Front Axle 142.2 in View Full Specs 657G Wheel Tractor-Scraper Flywheel Power - Tractor/Scraper 447 kw (600 hp) / 337 kW (451 hp) Scraper Capacity - Heaped 73 yd³ Top Speed - Loaded 33 mile/h View Full Specs 657G Wheel Tractor-Scraper Flywheel Power - Tractor/Scraper 447 kW (600 hp) / 337 kW (451 hp) Scraper Capacity - Heaped 44 yd³ Top Speed - Loaded 33 mile/h View Full Specs
