621 Partial Wheel Tractor-Scraper
- Tractor Engine
- Cat® C13
- Flywheel Power - Tractor
- 407 hp
- Top Speed - Loaded
- 33.5 mile/h
631 Partial Wheel Tractor-Scraper
- Tractor Engine
- Cat® C18
- Flywheel Power - Tractor
- 570 hp
- Top Speed - Loaded
- 34.7 mile/h
651 Partial Wheel Tractor-Scraper
- Tractor Engine
- Cat® C18
- Gross Power (SAE J1995)
- 637 hp
- Top Speed - Loaded
- 34.9 mile/h