M320 Wheeled Excavator



Technical Specifications
Benefits and Features
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The Cat® M320 Excavator maximizes performance with up to 16 percent more swing torque to get the job done faster. Save time and money with up to 10 percent overall savings in maintenance costs, longer service intervals, and 100 percent daily ground-level maintenance. Combined with a comfortable working environment, the M320 keeps you working quickly and efficiently.

Engine Power - ISO 14396 174 HP
Engine Model C4.4
Engine Power - Maximum Gross - ISO 14396 - Metric 129.4 kW (176 hp) (PS)
Bore 4 in
Displacement 268.5 in³
Stroke 5.3 in
Machine Weight
Operating Weight Maximum 46740 lb
Operating Weight Minimum 41450 lb
Maximum Travel Speed 21.7 mile/h
Hydraulic System
Main System - Maximum Flow - Implement 81 gal/min
Maximum Pressure - Equipment 5366 psi
Maximum Pressure - Swing 5729 gal/min
Maximum Pressure - Travel 5076 gal/min
Service Refill Capacities
Cooling System 8.4 gal (US)
Diesel Exhaust Fluid (DEF) 7.9 gal (US)
Hydraulic System - Including Tank 71.3 gal (US)
Hydraulic Tank 40.9 gal (US)
Final Drive 0.7 gal (US)
Fuel Tank 124.2 gal (US)
Boom 5260 mm (17'3")
Bucket 0.98 m³ GD (1.28 yd³)
Stick 2.5 m (8' 2")
Shipping Height - Top of Cab 11 ft
Shipping Length 29.3 ft
Counterweight Clearance 4.3 ft
Ground Clearance 1.4 ft
Support Point 11.8 ft
Tail Swing Radius 8.5 ft
Wheel Base 8.9 ft
Working Ranges and Forces
Boom Type VA Boom
Bucket 0.98 m³ GD (1.28 yd³)
Stick 2.5 m (8' 2")
Reach at Ground Level 30.5 ft
Vertical Wall Digging Depth 13.9 ft
Cutting Height 32.6 ft
Bucket Forces (ISO) 30799 lbf
Stick Forces (ISO) 20682 lbf
Note (1) Range values are with dual pneumatic tires (10.00-20). Range values are calculated with a GD bucket (CW) and CW-30 quick coupler with a tip radius of 1535 mm (5'0").
Swing Mechanism
Swing Speed 9.2 r/min
Maximum Swing Torque 37000 ft·lbf
Service Refill
Engine Oil 3.4 gal (US)
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.


  • Cat Payload helps you achieve precise load targets to improve your operating efficiency. Pick up a load of material--with a bucket and thumb combination or grapple and clamshell attachments--and get a real-time weight estimate without swinging.
  • New optional auxiliary relay powers on and turns off CB radios, beacon lights, and other attachments without you taking your hands off the joysticks.
  • Remote Flash and Remote Troubleshoot now standard.

Not all features are available in all regions. Please check with your local Cat dealer for specific offering availability in your area. Build Number: 07C


  • The Cat engine matches to your performance and production needs. The engine meets U.S. EPA Tier 4 Final, EU Stage V, and South Korea 2014 (Tier 4 Final) emission standards.
  • Travel between sites easier with travel speeds up to 35 kph (21.7 mph).
  • From dirt to asphalt, the excavator matches your needs to get the job done in a timely, efficient manner.
  • The advanced hydraulic system provides the optimum balance of power and efficiency while giving you the control you need for precise working requirements.
  • With up to 14 percent more swing torque, you can get the job done faster to move on to the next one. The dedicated swing pump provides consistent power for better multitasking capabilities.
  • Auxiliary hydraulic options give you the versatility to use a wide range of Cat attachments.
  • Don't let the temperature stop you from working. The excavator has a standard high-ambient temperature capability of 52° C (125° F) and cold start capability of -18° C (0° F).
  • Standard Product Link provides location, machine hours, fuel usage, productivity, idle time, diagnostic codes, and other machine data on demand through the VisionLink online interface, helping you improve jobsite efficiency and lowering operating costs.


  • Choose between Deluxe and Premium cab options.
  • The Deluxe seat is heated and air adjustable while the Premium seat is heated, ventilated, and adjusts automatically.
  • Get in and out of the cab easier using the tip-up left console.
  • Feel more comfortable in the cab while you work with reduced cab vibrations from advanced viscous mounts.
  • Control the excavator comfortably with easy-to-reach controls, all located in front of you.
  • Stow your gear with plenty of in-cab storage beneath and behind the seat, overhead, and in the consoles. A cup holder, bottle holder, and coat hook are also provided.
  • Bluetooth® integrated radio allows for seamless mobile phone connection to listen to music, to podcasts, and for hands-free calling.
  • Easily adjust to your ideal temperature with the touchscreen monitor or jog dial.


  • Quickly check and service your machine with daily maintenance points accessible from ground level.
  • Check the engine oil level quickly and safely from the ground.
  • Save up to 10 percent in maintenance parts with the new, longer lasting filters.
  • Track your machine's filter life and maintenance intervals on the in-cab monitor.
  • Two levels of fuel filtration protect the engine from dirty diesel.
  • The new hydraulic oil filter provides improved filtration performance, anti-drain valves to keep oil clean when the filter is replaced, and longer life with a 3,000-hour replacement interval - 50 percent longer than previous filter designs.
  • S-O-S ports are located at ground level, simplifying maintenance and allowing for quick, easy extraction of fluid samples for analysis.


  • Start the engine with the push-to-start button, a Bluetooth key fob, or the unique Operator ID function.
  • Program your power mode and joystick preferences using OperatorID; the excavator remembers your settings each time you go to work.
  • Navigate quickly on the standard high-resolution 254 mm (10 in) touchscreen monitor or with the aid of the jog dial control.
  • Not sure how a function works or how to maintain the excavator? Simply access the operator's manual on the touchscreen monitor.
  • The auto axle lock presses the pedal for you to reduce your overall number of actions. The machine automatically detects when the service brake and axle need to be locked or unlocked. It releases automatically when you press the travel pedal.


  • Access daily maintenance points from ground level.
  • Keep your excavator secure with Operator ID. Use your PIN code on the monitor to enable the pushbutton starting feature.
  • The standard ROPS cab meets ISO 12117-2:2008 requirements.
  • Enjoy better visibility into trenches, in each swing direction, and behind you with the help of smaller cab pillars, larger windows, and a flat engine hood design. Rearview and side-view cameras are standard.
  • The service platform design provides easy, safe, and quick access to upper service platform; the service platform steps use anti-skid punch plate to prevent slipping.
  • The standard hydraulic lockout lever isolates all hydraulic and travel functions in the lowered position.
  • Swing lock prevents front linkage from moving as you travel.
  • Ground-level shut-off switch stops all fuel to the engine when activated and shuts down the machine.

Boost Efficiency and Productivity with Integrated Cat Technologies

  • Boost productivity versus traditional grading with optional Cat Grade with 2D system.
  • Optional Cat Payload on-board weighing system: Achieve precise load targets and increase loading efficiency with on-the-go weighing and real-time estimates of your payload without swinging.
  • Combine Payload with VisionLink® and remotely manage your production targets or take payload data with you. The monitor's USB port lets you download your results from one shift all the way up to 30 days of work so can manage your progress without needing an internet connection or VisionLink subscription.
  • Upgrade to optional Cat Grade with Advanced 2D: Create and edit grade designs with ease on a second high-resolution 254 mm (10 in) touchscreen monitor.
  • Upgrade to optional Cat Grade with 3D: Create and edit designs with ease and see the front linkage's full range of motion on a second high-resolution touchscreen monitor.
  • Optional 2D E-fence is integrated right out of the factory to prevent the excavator from moving outside operator defined set points.
  • All Cat Grade systems are compatible with radios and base stations from Trimble, Topcon, and Leica. Already invested in a grade infrastructure? You can install grade systems from Trimble, Topcon, and Leica onto the machine.

Standard Equipment:

  • Note
    • Standard and optional equipment may vary. Consult your Cat dealer for details.
  • Cab
    • ROPS, sound suppression
    • High-resolution 254 mm (10 in) LCD touchscreen monitor
  • Cat Technologies
    • Cat Product Link
    • Remote Flash/Troubleshoot Capability
  • Electrical System
    • LED lights on boom and cab
    • LED lights on chassis (left-hand, right-hand) an counterweight
    • Programmable time-delay LED working lights
    • Roading and indicator lights, front and rear
    • Maintenance free batteries
    • Centralized electrical disconnect switch
    • Electrical refueling pump
  • Engine
    • Power Mode Selector
    • One-touch low idle with auto engine speed control
    • Auto engine idle shutdown
    • 52° C (125° F) high-ambient cooling capacity
    • Cold start capability -18° C (0° F)
    • Double element air filter with integrated precleaner
    • Electric fuel priming pump
    • On-demand electric cooling fans with autoreverse function
    • Biodiesel capability up to B20
  • Hydraulic System
    • Automatic swing brake
    • Auto hydraulic oil warm up
    • Electronic main control valve
    • Boom and stick drift reduction valves
    • Heavy lift mode
    • Quick coupler circuit
    • Separate dedicated swing pump
  • Safety And Security
    • Rear and side-view cameras
    • Wide angle mirrors
    • Ground-level engine shutoff switch
    • Anti-skid plate and countersunk bolts on service platform
    • Signaling/warning horn
  • Service And Maintenance
    • Sampling ports for Scheduled Oil Sampling (S-O-S)
  • Undercarriage And Structures
    • Automatic brake/axle lock
    • All wheel drive

Optional Equipment:

  • Note
    • Standard and optional equipment may vary. Consult your Cat dealer for details.
  • Boom And Sticks
    • 5650 mm (18'6") one-piece boom
    • 5260 mm (17'3") variable adjustable boom
    • 2500 mm (8'2") stick
    • 2900 mm (9'6") stick
  • Cat Technologies
    • Cat Grade with 2D
    • Cat Grade with Advanced 2D
    • Cat Grade with 3D
    • Payload
    • 2D E-Fence
  • Cab
    • Deluxe cab
    • Premium cab
    • Auxiliary relay
  • Electrical System
    • Electrical refueling pump
  • Hydraulic System
    • One-slider joysticks
    • Two-slider joysticks
    • Combined flow/high-pressure auxiliary circuit
    • SmartBoom
    • Ride control
    • Cat tilrotator support
    • Joystick steering
  • Safety And Security
    • 360° visibility
    • Cat asset tracker
  • Service And Maintenance
    • Automatic lubrication system for implement and swing system
  • Undercarriage And Structures
    • 10.00-20 16 PR, dual tires
    • 315/70R22.5, no gap dual tires
    • 445/70R 19.5, single tires
    • 3700 kg (8,160 lb) counterweight
    • 4200 kg (9,260 lb) counterweight

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