2026 Caterpillar 321

The Caterpillar 321 is a hydraulic excavator in Caterpillar's medium-size excavator range, designed for earthmoving, trenching, site preparation, and general construction work. It is commonly used in utility, roadbuilding, and material handling applications where digging depth, reach, and lifting capability are required. The Cat 321 typically features a fuel-efficient diesel engine, advanced hydraulic controls, and a reinforced undercarriage for stability and durability. Operator comfort, visibility, and machine monitoring systems are standard considerations in this class. The Caterpillar 321 is available in multiple configurations depending on market and production year, with attachments such as buckets, thumbs, and hydraulic tools.