Cat 320: 20-ton class crawler excavator. Operating weight: 44,600-50,200 lb. Engine: Cat C4.4 (131 hp). Max dig depth: 21 ft 11 in. Max reach: 32 ft 4 in. Bucket capacity: 0.76-1.54 yd³. Swing speed: 11.2 rpm. Travel speed: 3.4 mph. Ground pressure: 6.3 psi. Fuel consumption: 4-7 gal/hr. Attachments: bucket, hammer, thumb, grapple, auger, compactor, ripper. Operator cert: NCCCO or manufacturer-specific. OSHA: daily walkaround inspection, competent person for excavation. Rental: $2,500-$4,500/week. Purchase: $200,000-$350,000 new. Common uses: trenching, foundation excavation, site grading, utility installation, demolition. Transport: lowboy trailer (permit for width).