Wheeled excavator M320

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Overview
The Cat® M320 wheel excavator provides stability, fuel-efficient performance and operator-focused controls for construction, utilities and road maintenance applications. Designed with a long wheelbase, auto-axle lock and ergonomic joystick operation, it reduces operator fatigue and operating costs while maintaining high productivity.

Benefits

• Ease of Use: Long wheelbase undercarriage and intuitive controls enable smooth, controlled operation for a variety of jobsite tasks.
• High Performance: Improved stability for confident handling of heavy loads and attachments.
• Low Maintenance Costs: Designed for extended service intervals and simplified ground-level maintenance to reduce downtime.

Features At A Glance

• Do More with Less Fuel
  • Cat® C4.4 engine compliant with Brazil MAR-1 (equivalent to U.S. EPA Tier 3 / EU Stage IIIA).
  • Fuel-efficient design and Automatic Engine Speed Control to lower consumption.
  • Travel speeds up to 35 km/h (22 mph) for faster site-to-site movement.
  • Advanced hydraulic system for balanced power and precision digging; auxiliary hydraulic options for a wide range of Cat® attachments.
  • High-ambient capability to 52°C (125°F) and cold-start capability to -18°C (0°F).
• Low Maintenance Costs
  • Up to 17% lower maintenance costs with accessible daily service points at ground level.
  • Hydraulic oil filter with anti-drain valves and 2,000-hour replacement interval.
  • Long greasing intervals with grouped grease points and S·O·S℠ ports at ground level.
  • Parts commonality with the 320 excavator to simplify service and inventory.
• Work in Comfort
  • Ergonomic cab layout with minimal, conveniently located controls and optional operator guards.
  • Tilt-up left console and straight ground access for easy entry/exit.
  • Optional Bluetooth® radio and touchscreen monitor with HVAC controls.
• Simple to Operate
  • Push-to-start button and easy-to-reach controls with two-way travel pedal.
  • Long wheelbase and auto-axle lock for stable, smooth operation and reduced operator fatigue.
  • Touchscreen monitor offering jobsite dashboard and productivity applications.
• Safety Features
  • Ground-level access to daily service points and grouped grease points.
  • Standard LED lighting, enhanced visibility with slim cab pillars and large windows.
  • Rear and right-side cameras standard and a service platform with anti-skid surface.
  • Ground-level shutoff switch and dedicated tie-down points for transport.
• Sustainability
  • Engine meets MAR-1 / Tier 3 / Stage IIIA equivalence and is compatible with certain lower-carbon-intensity fuels (consult dealer for blends above B20).
  • Extended maintenance intervals and Auto Engine Speed Control reduce fuel use and emissions.

Key Specs
Engine Power - ISO 14396: 129 kW
Operating Weight Maximum: 21500 kg
Maximum Travel Speed: 35 km/h

Engine
Engine Model: Cat® C4.4
Engine Power - ISO 14396: 129 kW (174 hp advertised)
Net Power - ISO 9249: 128 kW (171 hp)
Bore: 105 mm
Stroke: 127 mm
Displacement: 4.4 L
Biodiesel Capability: Up to B20 (consult dealer for higher blends)
Emissions: Meets Brazil MAR-1 (equivalent to U.S. EPA Tier 3 / EU Stage IIIA)

Machine Weight
Operating Weight Maximum: 21500 kg
Operating Weight Minimum: 20000 kg
Note: Operating weight includes full fuel tank, operator, General Duty bucket and dual pneumatic tires; weight varies by configuration (typical includes 2.92 m stick and 4000 kg counterweight).

Drive
Maximum Travel Speed: 35 km/h

Hydraulic System
Main System - Maximum Flow (Implement): 429 L/min
Maximum Pressure - Implement Circuit (Normal): 35000 kPa
Maximum Pressure - Implement Circuit (Heavy Lift): 37000 kPa
Maximum Pressure - Travel Circuit: 35000 kPa

Swing Mechanism
Maximum Swing Speed: 11 r/min
Maximum Swing Torque: 62 kN·m

Service Refill Capacities
Fuel Tank: 338 L
Cooling System: 29 L
Hydraulic Tank: 151 L
Hydraulic System (including tank): 270 L

Dimensions
Boom: One-piece 5.7 m (18'7")
Stick: 2.92 m (9'7")
Bucket: General Duty (GD) 1.19 m³ (1.56 yd³)
Shipping Height (top of cab): 3355 mm
Shipping Length: 9600 mm
Support Point: 2860 mm
Tail Swing Radius: 2817 mm
Counterweight Clearance: 1316 mm
Ground Clearance: 325 mm
Undercarriage Length: 5160 mm
Wheel Base: 2800 mm

Working Ranges and Forces
Digging Height: 9740 mm
Dump Height: 6780 mm
Maximum Digging Depth: 6430 mm
Maximum Vertical Wall Digging Depth: 5413 mm
Maximum Reach at Ground Line: 9880 mm
Stick Forces (ISO): 102 kN
Bucket Forces (ISO): 120 kN
Note: All dimensions approximate with 10.00-20 dual pneumatic tires.

Service & Maintenance / Other Features
Ground-level S·O·S ports; grouped grease points; long greasing intervals; 2000-hour hydraulic filter interval; high-ambient cooling to 52°C; cold start to -18°C; one-touch low idle and automatic engine speed control; VisionLink™ compatible.

Technical specifications

• Model: M320
• Brand: Cat®
• Engine: Cat® C4.4, 4.4 L
• Engine Power (ISO 14396): 129 kW
• Net Power (ISO 9249): 128 kW
• Operating Weight (max): 21500 kg
• Max Travel Speed: 35 km/h
• Hydraulic Implement Flow (max): 429 L/min
• Hydraulic System Capacity (including tank): 270 L
• Fuel Tank Capacity: 338 L
• Biodiesel Capability: Up to B20 (consult dealer for higher blends)
• Emission Standard: Brazil MAR-1 / Tier 3 / Stage IIIA equivalence
• Boom/Stick: 5.7 m boom / 2.92 m stick (standard)
• Bucket (GD): 1.19 m³