621 Wheel Tractor-Scraper
- Maximum Depth of Cut
- 12 in
- Fuel Tank Refill Capacity - Scraper
- 216 gal (US)
- 180° Curb-to-Curb Turning Width
- 39 ft
651 Wheel Tractor-Scraper
- Tractor Engine
- Cat® C18
- Flywheel Power - Tractor/Scraper
- 469kW (629 hp)
- Bore
- 6 in
657 Wheel Tractor-Scraper
- Tractor Engine
- Cat® C18
- Scraper Engine
- Cat® C15
- Flywheel Power - Tractor/Scraper
- 469kW (637 hp) / 353 kW (479 hp)