M320 Wheeled Excavator



Technical Specifications
Benefits and Features
360 View

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 Power - ISO 14396 (DIN) 176 hp (metric)
Engine Model C4.4
Net Power - ISO 9249 171 HP
Net Power - ISO 9249 (DIN) 174 hp (metric)
Bore 4 in
Displacement 268.5 in³
Stroke 5.3 in
Biodiesel Capability Up to B20¹
Emissions Meets U.S. EPA Tier 4 Final, EU Stage V, Japan 2014 emission standards.
Note (1) Net power advertised is the power available at the flywheel when the engine is equipped with fan, air cleaner, CEM exhaust gas aftertreatment, alternator, and cooling fan with engine speed at 2,200 rpm. Advertised power is tested per the specified standar
Note (2) ¹Cat diesel engines are required to use ULSD (ultra-low sulfur diesel fuel with 15 ppm of sulfur or less) or ULSD blended with the following lower-carbon intensity fuels** up to: 20% biodiesel FAME (fatty acid methyl ester)* or 100% renewable diesel, HVO
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
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.



  • Cab Monitor Improvements

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

  3. Identify apps quickly with a grid list view, abbreviated app names, and categorized menu options.

  5. A new notification center keeps important information visible to the operator, and displays messages without shrinking the camera view. 

  7. Color coded notifications set critical messages apart from the rest.

  9. Use the in-monitor QR code to learn about machine and technology features through a full suite of “how-to” videos.

  • Enhance visibility to make service work easier and safer with optional inspection lighting.

  • Standard integrated vehicle health management system alerts the operator with service guidance and parts needed to enhance uptime.   

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



  • 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).



  • 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 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 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.

  • Boost productivity with proactive service reminders. The Integrated vehicle health management system alerts the operator with step-by-step service guidance along with parts needed so you don't experience any unnecessary downtime.



  • 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 axle locks at zero speed and unlocks when the travel pedal is activated. The axle can also be manually locked with a button on the right-hand console.

  • Tiltrotator attachments--ours or other brands--work seamlessly with Cat 2D Grade, Assist, Payload, and E-Fence . With no additional hardware required, all you have to do is simply select "Third Party Tiltrotator System Installation" in the monitor, do the calibration, and get to work.

  • Cat continues to improve user interface functionality for operators of all skill levels. The touchscreen monitor is an easy-to-use operating tool that presents the jobsite dashboard with an intuitive format. Productivity applications are displayed in grid-view to read on-the-go, and touchscreen navigation is programmed to make sure job performance continues without any hold ups.



  • 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.

  • Make service work easier and safer with optional inspection lighting. With the flip of a switch, lights will illuminate the engine, pump, battery, and radiator compartments to enhance visibility.

Boost Efficiency and Productivity with Integrated Cat Technologies


  • Boost productivity versus traditional grading with optional Cat Grade with 2D system.

  • Optional 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.

  • Combine Payload with VisionLink® and remotely manage your production targets or take payload data with you. 

  • Upgrade to our dual antenna GNSS for maximum grading efficiency. The system lets you create and edit designs on the touchscreen monitor while you’re on the job, or you can have the plan design sent to the excavator to make your work easier. Plus, you get added benefits of avoidance zones, cut and fill mapping, lane guidance, and augmented reality along with advanced positioning capability.

  • Optional Grade Assist helps you stay on grade – simply and effortlessly – with single-lever digging. Set your desired bucket angle and let Bucket Assist automatically maintain the angle in sloping, leveling, fine grading, and trenching applications

  • 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.



  • The Cat® C4.4 engine meets U.S. EPA Tier 4 Final, EU Stage V, and Korea Tier 5 emission standards.

  • Cat diesel engines are required to use ULSD (ultra-low sulfur diesel fuel with 15 ppm of sulfur or less) or ULSD blended with the following lower-carbon intensity fuels** up to: 20% biodiesel FAME (fatty acid methyl ester)* or 100% renewable diesel, HVO (hydrotreated vegetable oil) and GTL (gas-to-liquid) fuels.Refer to guidelines for successful application. Please consult your Cat dealer or "Caterpillar Machine Fluids Recommendations" (SEBU6250) for details.

  • Cat Grade technologies combine advanced guidance with optional automated machine control helping you reach grading targets while reducing fuel burn and greenhouse gas emissions by improving efficiency, job site productivity, and accuracy.

  • Auto Engine Speed Control reduces unnecessary fuel burn and greenhouse gas emissions by allowing the engine to automatically go into idle mode when the machine is not working.

  • Cat® Payload for excavators provides on-the-go material weighing which helps reduce fuel burn by improving loading efficiency, job site productivity, and eliminating trips to the scale.

  • Extended maintenance intervals not only reduce downtime but decrease the amount of fluid and filters that are replaced over the life of the machine.

  • Cat Scheduled Oil Sampling (S•O•S℠) Services helps reveal excessive wear, contaminated fluids or other “unseen” issues that can shorten component life. In many cases, you can extend oil and coolant change intervals by using fluid monitoring. Consult your Cat dealer or the machine's operation and maintenance manual for more information.

  • Don't waste fuel idling. Cat VisionLink® online fleet monitoring helps you manage idle time and reduce fuel burn and greenhouse gas emissions. VisionLink® displays the CO2 emissions for monitored assets, calculated by fuel type for the Runtime Fuel Burned each day in a selected date range.

  • Remote Flash minimizes downtime and maintenance time while keeping your asset running with maximum efficiency. Alerts for machine updates are sent virtually from your Cat dealer and updates can be deployed without a dealer technician needing to be onsite. Remote Troubleshoot decreases maintenance time and keeps your machine running with maximum efficiency by allowing your Cat dealer to virtually test the machine while working. Once a problem is identified, a technician can fix it the first time, saving time and money.

*Engines with no aftertreatment devices can use higher blends, up to 100% biodiesel (for use of  blends higher than 20% biodiesel, consult your Cat dealer).**Tailpipe greenhouse gas emissions from lower-carbon intensity fuels are essentially the same as traditional fuels.

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 Technology
    • VisionLink
    • Remote Flash
    • Remote Troubleshoot
  • 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
  • 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
    • Inspection lighting
    • 2D E-Fence
  • Service And Maintenance
    • Sampling ports for Scheduled Oil Sampling (S-O-S)
    • Integrated vehicle health management system
  • 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
  • Cab
    • Deluxe cab
    • Premium cab
    • Auxiliary relay
  • Cat Technology
    • Cat Grade Connectivity
    • Cat Grade 2D
    • Cat Grade with Attachment Ready Option (ARO)
    • Cat Grade 3D dual GNSS
    • Laser catcher
    • Grade Assist
    • Cat Payload
    • Cat Tilt Rotator (TRS) Integration
  • 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
    • 11.00-20-16 PR, dual tires
    • 315/70R22.5, no gap dual tires
    • 445/70R 19.5, single tires
    • 300-80-22.5 dual pneumatic, spacerless tire
    • 3600 kg (7,937 lb) counterweight
    • 4200 kg (9,260 lb) counterweight

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