Caterpillar 631K vs Caterpillar 657G

	Caterpillar Caterpillar 631K	Caterpillar Caterpillar 657G
Operating weight	—	—
Engine power	—	—
Heaped capacity	≈26 m³ (34 yd³)	≈33 m³ (44 yd³)
Configuration	Single engine, open bowl	Twin engine, push-pull capable
Rated load	—	≈43,000 kg (95,000 lb)
Strengths	+ High capacity + Fast haul speeds	+ Huge capacity for mass earthmoving + Push-pull capability
Watch-outs	− Needs push loading	− Only economical on very large projects
	Full 631K review	Full 657G review

Specifications are typical figures for standard configurations and may be measured differently by each manufacturer (for example net vs gross power). Always confirm with the manufacturer or dealer. Build another comparison.