CAT 321 Excavator

The Cat C3.6 engine and electrohydraulic system work in sync to help you move plenty of material while using less fuel.

Electro-hydraulic (EH) system eliminates the need for pilot lines and filter for improved response and enhanced savings.

Intelligent Engine Control Module (ECM) ensures smooth, precise operation in every pass.

Save fuel with Automatic Engine Control (AEC). It reduces engine speed when the machine is not under load to minimize fuel consumption.

Robust and easy-to-maintain fuel system filtration reduces risk of failure from contaminated fuel.

Boom and Stick regeneration circuits reduce fuel consumption while improving cycle times.

Protect hydraulic components in cold weather. The auto warm-up feature speeds hydraulic oil warming in cooler temperatures.

Reinforced Cat structures extend machine life in harsh working conditions.

Reliable and durable and built on classic, proven components.

Robotically welded booms and sticks ensure structural integrity.

Track guards and steep-angle design shed debris, reducing wear.

Choose between two robust undercarriage options: standard 4.1 m (13'5") or medium 4.25 m (13'11"), both built to withstand demanding conditions.

The single plane cooling package design reduces air resistance compared to the traditional two-plane design for better cooling performance and enhanced machine productivity.

Sloped track frame helps prevent mud and debris from accumulating in the track area.

High swing speed and proven Cat components keep you working longer.

Shared components simplify maintenance and improve parts availability.

Scheduled Oil Sampling (S·O·SSM) ports are on ground level, simplifying maintenance and allowing for quick, easy extraction of samples for fluid analysis.

Extended and synchronized service intervals save on maintenance costs.

Extended first engine oil change interval (500 hours), and maintenance-free batteries.

Maximize uptime and extended service intervals, thanks to advanced hydraulic oil filter design and no pilot and case drain filters.

Proven, high-efficiency radial seal engine air filter behind the cab. The machine constantly monitors the engine air filter and will notifyyou, via the monitor, when service is required.

The latest air intake filter with pre-cleaner has double the dust holding capacity of the previous air intake filter.

The latest cab provides excellent visibility from the operator’s seat. In addition, two standard mirrors help keep you aware of your surroundings.

Optional rearview camera enhances visibility behind the machine.

Optional front windshield guard helps protect the windshield from potential damage caused by rocks, flying debris, and other road materials.

Heavy-duty base frame and reinforced “X” car body conform to ISO 15818:2017 lifting and tie-down requirements.

Handrails and hand hold with a step on the undercarriage for easy access to the engine bay area. The handrails conform to ISO 2867:2011 requirements for added safety.

Anti-skid plating with countersunk bolts reduces the potential for slippage and trip hazards.

Start the engine with a push button.

The in-cab high-resolution 203 mm (8 in) touchscreen monitor is easy to use, intuitive, and user-friendly.

Continuously improved user interface allows for intuitive navigation, minimizing performance interruption with the easy-to-use touchscreen menu.

The machine’s electrohydraulic system allows accurate bucket control for maximum precision.

Optimized low-effort joystick controls reduce operator fatigue.

Customize joystick patterns and preferences; the machine remembers each operator's settings.

Auto hammer stop protects tools from overheating and wear.

Ergonomically designed seat to improve operator’s comfort.

Sound suppression, seals, and viscous cab mounts decrease noise and vibration for a quieter work environment.

Excellent work site visibility from the cab enhances productivity and safety.

Adjustable seat with three suspension levels and ergonomic design.

Climate control, Bluetooth® connectivity, USB ports, and an intuitive interface enhance comfort.

Easy to access radio controls, engine throttle, wiper controls and Bluetooth phone pairing for operator convenience.

Bright seatbelts and a wide cab entry improve safety and usability.

VisionLinkTM wirelessly connects you to your equipment, giving you access to essential information you need to know to run your business. Gain valuable insight into how your machine or fleet is performing. Access data anywhere—desktop, tablet, or mobile device.

Available CVA (Customer Value Agreements) and EPP (Extended Protection Plans) help maximize uptime and reduce risk.

Cat dealers are second to none. From machine selection and purchase to maintenance support, operator training and rebuilds, Cat dealers have the experience and capabilities to help keep you up and running at peak performance.