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A quiet cab and efficient power systems mean happier operators and more profit from every task you throw at the Cat® M320 Wheeled Excavator. Built to take on the toughest conditions, the M320 offers optional configurations and attachments to handle most any job site need.

Operating Weight Maximum 19500 kg
Maximum Travel Speed 37 km/h
Engine Model Cat® C4.4

Technicial Specifications

Machine Weight
Operating Weight Maximum 19500 kg
Operating Weight Minimum 19000 kg
Note (1) Operating weight includes medium stick, 4000 kg counterweight, full fuel tank, operator, 245 kg quick coupler, 695 kg bucket and dual pneumatic tires. Weight varies depending on configuration.
Maximum Travel Speed 37 km/h
Engine Model Cat® C4.4
Bore 105 mm
Displacement 7 l
Stroke 135 mm
Engine Emissions Meets U.S. EPA Tier 3 and EU Stage IIIA emission standards.
Note (1) The M320 meets Tier 3 and Stage IIIA emission standards. Net power is tested per ISO 9249:2007. Standards in effect at the time of manufacture. Net power available at flywheel when the engine is equipped with fan, air cleaner, muffler, and alternator with engine speed at 2,000 rpm.
Note (2) No engine power derating required below 3,000 m (9,843 ft) altitude.
Note (3) Recommended for use up to 3000 m (9,843 ft) altitude with engine power derate above 3000 m (9,840 ft).
Note (4) Rated speed at 2,000 rpm.
Hydraulic System
Maximum Pressure - Equipment 35000 kPa
Maximum Pressure - Swing 31000 kPa
Maximum Pressure - Travel 35000 kPa
Swing Mechanism
Maximum Swing Torque 43.4 kN·m
Maximum Swing Speed 9.2 r/min
Service Refill Capacities
Cooling System 37 l
Fuel Tank 385 l
Hydraulic System - Including Tank 270 l
Hydraulic Tank 170 l
Boom 5350 mm (17'7")
Bucket GD 0.91 m³ (1.19 yd³)
Stick 2.5 m (8'2")
Counterweight Clearance 1280 mm
Shipping Height - Top of Cab 3300 mm
Shipping Length 8960 mm
Tail Swing Radius 2565 mm
Working Ranges and Forces
Boom Type One-Piece Boom
Bucket GD 0.91 m³ (1.19 yd³)
Stick 2.5 m (8'2")
Digging Height 8940 mm
Dump Height 6140 mm
Reach at Ground Level 9295 mm
Vertical Wall Digging Depth 3935 mm
Note (1) Range values are calculated with a bucket (1200GD-CW30) (0.91 m3) with TIP GP-GEN DUTY (K80) and CW-30 quick coupler with a tip radius of 1535 mm (5'5").
Air Conditioning System
Note The air conditioning system on this machine contains the fluorinated greenhouse gas refrigerant R134a (Global Warming Potential = 1430). The system contains 0.85 kg of refrigerant which has a CO2 equivalent of 1.216 metric tonnes.

Advantages and Features


  • Cat® C7.1 engine meets EU Stage IIIA equivalent emission standards.
  • Engine fuel system designed to manage world-wide fuel quality and provide outstanding low fuel consumption during both working and traveling applications.
  • One-Touch Low Idle Control and Automatic Engine Speed Control reduces engine speed if no operation is performed, reducing fuel consumption and sound levels.
  • Three working modes: Power mode, Eco Mode and Travel mode.
  • Constant Power Strategy, providing a quick response to changing loads, while delivering the same amount of power.
  • Choice of various booms and sticks provides the right balance of reach and digging forces for all applications.
  • Dedicated Swing Pump allows faster and smoother combined movements when using the implements while swinging.


  • Multiple configurations meet all your applications needs, with a choice of booms, sticks, blade and/or stabilizer undercarriages.
  • Highly mobile, the M320 can travel up to 37 km/h.
  • Standard one-way high pressure hydraulics allow customers to install attachments like hammers without adding other lines.
  • Ten hydraulic pump flow and pressure settings can be preset within the monitor allowing quicker and easier attachment (optional).
  • A lifting eye into the bucket linkage, the heavy lift mode and the overload warning signal allow operators to safely lift heavy loads.
  • Wide range of Cat attachments to handle any job at hand.


  • ROPS cab structure and Operator Protective Guards (top and front guards) are available.
  • Ergonomically designed cab with controls kept to a minimum, conveniently located and easy to operate.
  • The optional air-suspension seat, with automatic weight adjustment and heated cushions enhance comfort and productivity.
  • Safety is enhanced by the all-round visibility provided by large glass areas and skylight and the standard rear-mounted camera image displayed on the full color monitor.
  • Low sound levels, as a result of the variable fan speed and remote cooling system enabling.


  • 500 hours fuel filter replacement (reduced to 250 hours if fuel quality is sub-standard) allows reduced maintenance cost.
  • All daily maintenance points are accessible from ground level.
  • Clean design, with colored and numbered electrical wires, protected by thick braiding for ease of service.
  • Greasing points are centralized and kept to a minimum.
  • Cat XT™-6 ES hoses are resistant and durable, which reduce the risk of leaks that can reduce the performance of the machine.
  • Rigidity and long life with effective transmission protection and heavy duty axle.
  • Standard heavy duty batteries for improved cold start capability.


  • Cat technology solutions increase production and minimize operating costs. Link technologies wirelessly connect you to your job site, providing machine location, hours, fuel usage, idle time
    and event codes.

Standard Equipment

  • NOTE
    • Standard and optional equipment may vary. Consult your Cat dealer for details.
    • Alternator, 75 A
    • Boom working light
    • Cab mounted working lights, front and rear
    • Roading and indicator lights, front and rear
    • Main shut-off switch
    • Maintenance free batteries
    • Cat® C7.1 Single Turbo diesel engine - meets U.S. EPA Tier 4 Final and EU Stage emission standards.
    • Power mode selector
    • Air filter/fuel filter
    • Automatic engine speed control
    • Automatic starting aid
    • Work up to 3000 m (9,842 ft) above sea level without engine power de-rating
    • Fuel/water separator with level indicator
    • Muffler
    • Heavy lift mode
    • Separate dedicated swing pump
    • Stick regeneration circuit
    • Variable displacement, load sensing hydraulic system
    • Automatic swing brake
    • Capability to add auxiliary hydraulic circuits
    • Cat XT-6 ES hoses
    • Adjustable hydraulic sensitivity
    • Oil cooler
    • Anti-drift valve for bucket cylinder
    • Hydraulic mineral oil, Cat HYDO™ advanced 10 oil
    • Load sensing hydraulic system
    • Camera mounted on counterweight
    • Mirrors, frame and cab
    • Travel alarm
    • Signal/warning horn
    • Sampling ports for Scheduled Oil Sampling (SOS)
    • Caterpillar Datalink and Electronic Technician capability
    • Door locks and cab locks with Caterpillar one-key security system
    • Cat Product Link™
    • Creeper speed/ four wheel drive
    • Heavy-duty axles, advanced disc brake system and travel motor, adjustable braking force
    • Parking brake
    • Oscillating front axle, lockable, with remote greasing point
    • Full hydraulic steering with emergency capability
    • Steps with tool box in undercarriage (left and right)
    • Two-piece drive shaft
    • Two speed hydrostatic transmission
    • Counterweight (4000 KG-8818 lb)

Optional Equipment

  • NOTE
    • Standard and optional equipment may vary. Consult your Cat dealer for details.
    • One-Piece Boom
    • 2.5 m (8'2'') stick
    • 2.8 m (9'2'') stick
    • Bucket linkage with diverter valve
    • Electrical refueling pump
    • Rotating beacon on cab and chassis
    • 10.00-20 dual tires
    • 10.00-20 dual pneumatic tires with road profile
    • Rear blade (parallel) / front outrigger undercarriage
    • Rear outrigger / front blade (parallel) undercarriage