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Medium Excavators 320 - Tier 3


Peak Performance, User-Friendly Technology
The Cat® 320 raises the bar for efficiency and fuel economy in this size class. With the industry’s highest level of standard factory technology, a new cab focused on operator comfort and productivity, plus lower fuel and maintenance costs, the 320 will set a new pace for productivity and profit in your operation.


Up To 20% Less Fuel Consumption
A precise combination of lower engine speed and a large hydraulic pump delivers top performance while burning less fuel.

Up To 20% Lower Maintenance Costs
With extended and more synchronized maintenance intervals, you get more done at a lower cost compared to the previous model.

Up To 45% More operating efficiency
Offering the industry’s highest level of standard factory-equipped technology, including Cat Grade with 2D, Grade with Assist and Payload.



  • Use up to 20 percent less fuel than the Cat 320D2 excavator.
  • Increase operating efficiency up to 45 percent with standard Cat technologies that lower operator fatigue and your operating costs, including fuel consumption and daily maintenance.
  • The C7.1 engine can run on biodiesel up to B20 and meets U.S. EPA Tier 3/EU Stage IIIA/China Nonroad Stage III/Brazil Mar-1 equivalent emission standards.
  • The advanced hydraulic system provides the optimum balance of power and efficiency while giving you the control you need for precise digging requirements.
  • Match the excavator to the job with power modes; let Smart mode automatically match engine and hydraulic power to your digging conditions.
  • Advansys™ bucket tips increase penetration and improve cycle times. Tip changes can be done quickly with a simple lug wrench instead of a hammer or special tool, improving safety and uptime.
  • 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). An optional –32°C (–25° F) cold start package is available.


  • Automatically stop excavator swing at operator-defined set points in truck loading and trenching applications with Swing Assist, which will help you use less effort and consume less fuel.
  • Keep your tracks on the ground in lifting and hard digging with Boom Assist.
  • Set your desired bucket angle and let Bucket Assist automatically maintain the angle in sloping, leveling, fine grading, and trenching applications for easy, accurate, and fast jobs.
  • Standard Cat PAYLOAD on-board weighing system
    1. Achieve precise load targets and increase loading efficiency with on-the-go weighing and real-time estimates of your payload without swinging.
    2. Protect your hammer from overworking. Auto hammer stop warns you after 15 seconds of continuous firing and then automatically shuts it off after 30 seconds – all to prevent wear and tear on the attachment and excavator.
    3. Track your daily productivity such as truck target weights and load/cycle counts.
    4. Calibration can be performed in a matter of minutes.
    5. Combine Payload with VisionLink® and remotely manage your production targets.
    6. Take Payload data with you. The monitor's USB port lets you download results so you can manage progress without an internet connection or VisionLink® subscription.
  • Upgrade to optional Cat GRADE with Advanced 2D
    1. Create and edit grade designs with ease on a second high-resolution 10 in (254 mm) touchscreen monitor.
  • Upgrade to optional Cat GRADE with 3D
    1. Create and edit designs with ease and see the front linkage's full range of motion on a second high-resolution 10 in (254 mm) touchscreen monitor.
    2. Use the excavator’s onboard cell technology to quickly connect to 3D services like Trimble Connected Community or Virtual Reference Station.
    3. Know the excavator's exact position relative to GPS and GLONASS systems. The machine automatically compensates for excavator pitch and roll caused by sloping ground conditions.
    4. Already invested in another brand’s 3D system? No problem. Standard Cat technology like GRADE with 2D can readily integrate with that system to give you the precise results you need.
  • Get remote services
    1. Remote troubleshoot connects you to a dealer service pro to help solve your problem and quickly get you to work.
    2. Remoge flash works around your schedule to ensure your machine's software is up to date for optimal performance.
    3. The Cat App helps you manage fl eet location, hours, and maintenance schedules; it also alerts you for required maintenance and even allows you to request service from your local Cat dealer.
  • Standard Product Link™ provides location, machine hours, fuel usage, productivity, idle time, diagnostic codes, and other machine data on demand through VisionLink® online interface, helping you improve jobsite efficiency with lower operating costs.
  • 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.


  • Cab options let you choose the level of comfort you need.
  • Enjoy wide spacing between consoles for a more spacious comfortable environment.
  • Sit in new, wide seats that adjust for operators of all sizes (heated and heated/cooled options are available).
  • Get in and out of the cab easier using the tip-up left console (in Deluxe and Premium cabs only).
  • Control the excavator comfortably with easy-to-reach controls located in front of you. Standard automatic climate control keeps you at the right temperature throughout your shift.
  • Improved viscous mounts reduce cab vibration by up to 50% over our previous excavator models.
  • Stow your gear with plenty of in-cab storage behind the seat, overhead, and in the consoles.
  • The standard radio has USB ports and Bluetooth® technology enabled to connect your device and make hands-free calls.


  • Start the engine with a push button; use a Bluetooth key fob, or the Operator ID passcode.
  • Program each joystick button, including response and pattern, using Operator ID; the machine will remember what you set each time you go to work.
  • Program up to four depth and slope offsets so you can easily get to grade without a grade checker – a real time saver and safety enhancer on the jobsite.
  • Save more time and energy with available work tool recognition. A simple shake of the attached tool confirms its identity; it also ensures all the attachment settings are correct so you can get to work quickly and efficiently.
  • Navigate quickly on the standard high-resolution 203 mm (8in) touchscreen monitor, or with the optional 254 mm (10 in) touchscreen monitor, or with the aid of the jog dial control.
  • A second 254 mm (10 in) monitor is available for the advanced grade control.
  • Protect your hammer from overworking. Auto hammer stop warns you after 15 seconds of continuous firing and then automatically shuts it off after 30 seconds – all to prevent wear and tear on the attachment and excavator.
  • Not sure how a function works or how to maintain the excavator? Always have the operator’s manual at your fingertips in the touchscreen monitor.
  • The Cat PL161 Attachment Locator is a Bluetooth device that makes finding your attachments and other gear quick and easy. The excavator's onboard Bluetooth reader or Cat App on your phone will locate the device automatically.
  • Save more time and energy with the available work tool recognition feature. A simple shake of the attached tool confirms its identity; it also ensures all the attachment settings are correct so you can get to work quickly and efficiently.
  • Auto Dig Boost increases power by up to 8% for better bucket penetration, shorter cycle times, and greater payloads.
  • Make moving the excavator much easier with Cat Stick Steer. Simply push a button and use one hand to travel and turn instead of both hands or feet on levers or pedals.
  • Need more lift during your shift? Turn on Auto Heavy Lift and get 8% more power exactly when you need it for as long as you need it.


  • Expect up to 20 percent less maintenance cost than the 320D2 (savings calculated over 12,000 machine hours).
  • Do all daily maintenance at ground level.
  • Check engine oil level quickly and safely with the new ground-level engine oil dipstick; fill and check engine oil on top of the machine with a conveniently located second dipstick.
  • Reversing electric cooling fans make it easy to clean radiator, oil coolers, and condensers.
  • The new air intake filter with precleaner has double the dust holding capacity of the previous air intake filter.
  • Using Cat genuine oil and filters and doing your typical S∙O∙S monitoring will double the current service interval to 1,000 hours, giving you greater uptime to do more work.
  • 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 on ground level, simplifying maintenance and allowing for quick, easy extraction of fluid samples for analysis.


  • Work safely under structures or near traffic with standard 2D E-fence integrated right out of the factory. It prevents any part of the excavator from moving outside operator-defined set points, avoiding hazards and jobsite accidents.
  • Lift Assist helps you avoid tipping. With visual and auditory alerts, you'll know if your load is within the excavator's safe working range limits.
  • Access 100 percent of daily maintenance points from ground level – no need for you to climb on top of the excavator.
  • The standard ROPS cab meets ISO 12117-2:2008 requirements.
  • Enjoy great visibility into the trench, in each swing direction, and behind you with the help of smaller cab pillars, larger windows, and a flat engine hood design.
  • The standard hydraulic lockout lever isolates all hydraulic and travel functions in the lowered position.
  • Ground-level shutoff switch stops all fuel to the engine when activated and shuts down the machine.
  • A rearview camera is standard. Upgrade to 360° visibility and you'llsee objects and personnel around the excavator in a single view.
  • Right-hand 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 handrails comply with ISO 2867:2011 requirements.
  • 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.
  • Cat Detect - People Detection helps protect the most valuable asset on any jobsite – people. The system uses smart cameras with depth sensors to provide the operator with visual and auditory alerts so he or she can take immediate action when a person is too close to the excavator.



Net Power - ISO 9249         157 HP 117 kW
Engine Model         Cat C7.1 Cat C7.1
Bore         4 in 105 mm
Stroke         5 in 135 mm
Displacement         428 in³ 7.01 l


Main System - Maximum Flow     429 l/min (113 gal/min) 429 l/min (113 gal/min)
Maximum Pressure - Equipment     5075 psi 35000 kPa
Maximum Pressure - Equipment - Lift Mode     5510 psi 38000 kPa
Maximum Pressure - Travel     4974 psi 34300 kPa
Maximum Pressure - Swing     3988 psi 27500 kPa


Swing Speed     11.25 r/min 11.25 r/min
Maximum Swing Torque     60300 ft·lbf 82 kN·m


Operating Weight     47800 lb      21700 kg


Fuel Tank Capacity     86.6 gal (US) 345 l
Cooling System     6.6 gal (US) 25 l
Engine Oil     6.6 gal (US) 25 l
Swing Drive - Each     3.2 gal (US) 12 l
Final Drive - Each         1.1 gal (US) 4 l
Hydraulic System - Including Tank     61.8 gal (US) 234 l
Hydraulic Tank     30.4 gal (US) 115 l


Boom     Reach 5.7 m (18'8") Reach 5.7 m (18'8")
Stick     Reach R2.9B1 (9'6") Reach R2.9B1 (9'6")
Bucket     1.19 m³ (1.56 yd³) 1.19 m³ (1.56 yd³)
Shipping Height - Top of Cab         9.7 ft 2960 mm
Handrail Height     9.8 ft 2950 mm
Shipping Length     31.3 ft 9530 mm
Tail Swing Radius     9.3 ft 2830 mm
Counterweight Clearance     3.4 ft 1050 mm
Ground Clearance     1.5 ft 470 mm
Track Length     14.7 ft 4450 mm
Length to Center of Rollers     12 ft 3650 mm
Track Gauge     7.8 ft 2380 mm
Transport Width     9.8 ft 2980 mm


Maximum Digging Depth22 ft 6720 mm
BoomReach 5.7 m (18'8") Reach 5.7 m (18'8")
StickReach R2.9B1 (9'6") Reach R2.9B1 (9'6")
Bucket1.19 m³ (1.56 yd³) 1.19 m³ (1.56 yd³)
Maximum Reach at Ground Level32.3 ft 9860 mm
Maximum Cutting Height    30.7 ft 9370 mm
Maximum Loading Height21.3 ft 6490 mm
Minimum Loading Height7.1 ft 2170 mm
Maximum Depth Cut for 2440 mm (8 ft) Level Bottom21.5 ft 6550 mm
Maximum Vertical Wall Digging Depth17 ft 5190 mm
Bucket Digging Force - ISO33811 lbf 150 kN
Stick Digging Force - ISO  23911 ft·lbf 106 kN
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