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320 GX - Tier 3

320 GX - Tier 3

Introducing the 320 GX – our economy model with all the reliability and ease of operation you expect from a Cat® excavator, with easy maintenance and lower cost features designed to give you a faster return on your equipment investment.

Net Power - ISO 9249 103.6 kW
Operating Weight 20500 kg
Maximum Digging Depth 6430 mm

Technicial Specifications

Net Power - ISO 9249 103.6 kW
Net Power - ISO 9249 (DIN) 141 hp (metric)
Engine Model Cat C4.4
Engine Power - ISO 14396 108 kW
Engine Power - ISO 14396 (DIN) 147 hp (metric)
Bore 105 mm
Stroke 127 mm
Displacement 4.4 l
Biodiesel Capability Up to B20¹
Emissions Emits equivalent to U.S. EPA Tier 3 and EU Stage IIIA.
Note (1) Net power advertised is the power available at the flywheel when the engine is equipped with fan, air intake system, exhaust system and alternator with engine speed at 2,000 rpm. Advertised power is tested per the specified standard in effect at the time of manufacture.
Note (2) ¹Cat engines are compatible with diesel fuel blended with the following lower-carbon intensity fuels** up to: 100% 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. *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.
Operating Weight 20500 kg
Note Reach boom, R2.7 (8'9") stick, General Duty (GD) 0.93 m³ (1.22 yd³) bucket, 790 mm (31") triple grouser shoes, and 3600 kg (7,940 lb) counterweight.
Working Ranges & Forces
Maximum Digging Depth 6430 mm
Boom Reach 5.7 m (18'8")
Stick Reach 2.7 m (8'10")
Bucket GD 0.93 m³ (1.22 yd³)
Maximum Reach at Ground Level 9580 mm
Maximum Cutting Height 9290 mm
Maximum Loading Height 6450 mm
Minimum Loading Height 2460 mm
Maximum Depth Cut for 2440 mm (8 ft) Level Bottom 6250 mm
Maximum Vertical Wall Digging Depth 5510 mm
Bucket Digging Force - ISO 136 kN
Stick Digging Force - ISO 106 kN
Hydraulic System
Main System - Maximum Flow - Implement 429 l/min
Maximum Pressure - Equipment 35000 kPa
Maximum Pressure - Travel 35000 kPa
Maximum Pressure - Swing 25000 kPa
Swing Mechanism
Swing Speed 11.07 r/min
Maximum Swing Torque 74 kN·m
Service Refill Capacities
Fuel Tank Capacity 390 l
Cooling System 24.5 l
Engine Oil 15 l
Swing Drive 5.5 l
Final Drive - Each 4.5 l
Hydraulic System - Including Tank 218 l
Hydraulic Tank 115 l
Boom Reach 5.7 m (18'8")
Stick Reach 2.7 m (8'10")
Bucket GD 0.93 m³ (1.22 yd³)
Shipping Height - Top of Cab 2970 mm
Handrail Height 3010 mm
Shipping Length 9570 mm
Tail Swing Radius 2830 mm
Counterweight Clearance 1040 mm
Ground Clearance 460 mm
Track Length 4080 mm
Track Length to Center of Rollers 3270 mm
Track Gauge 2200 mm
Transport Width 2990 mm

Advantages and Features

Latest Features

Cab Monitor Improvements 
  • Continuously improved user interface allows for intuitive navigation, minimizing performance interruption with the easy-to-use touchscreen menu.
  • Identify apps quickly with a grid list view, abbreviated app names, and categorized menu options.
  • A notification center keeps important information visible to the operator, and displays messages without shrinking the camera view.
  • Color coded notifications set critical messages apart from the rest.
  • Use the in-monitor QR code to learn about machine and technology features through a full suite of “how-to” videos.

Not all features are available in all regions. Please check with your local Cat dealer for specific offering availability in your area. 
Build Number: 05E

Easy to Operate

  • The machine’s electrohydraulic system allows accurate bucket control for maximum precision.
  • Start the engine with a push button.
  • Navigate quickly on the high-resolution 203 mm (8 in) touchscreen monitor
  • Control the excavator comfortably with easy-to-reach controls all located in front of you.
  • Program your preferences for power mode, joystick pattern, and joystick response using Operator ID. The excavator will automatically remember your selections.

Easy to Maintain

  • Do daily maintenance at ground level.
  • Up to 20% less maintenance cost than the 320D2 GC due to enhanced filters and extended and synchronized service intervals (savings calculated over 12,000 machine hours).
  • The air intake filter with precleaner has double the dust holding capacity of the previous air intake filter. Final drive and swing drive oil is double the initial service life – from 250 to 500 hours.
  • Fuel filters are synchronized to be changed at 1,000 hours – double the interval from the previous filters.
  • 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% longer than previous filter designs.
  • Grease sealed between track pins and bushings reduces travel noise and prevents debris from entering to help increase undercarriage life.
  • Auto warm up speeds up hydraulic oil warming in cold temperatures and helps prolong the life of components.
  • 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.
  • S·O·SSM oil sampling ports are on ground level, simplifying maintenance and allowing for quick, easy extraction of fluid samples for analysis.

Low Owning and Operating Costs

  • The excavator uses up to 15% less fuel than the 320D2 GC in similar applications.
  • Match the excavator to the job with a choice of two modes: Power and Smart. Power mode provides full-time maximum output. Smart mode automatically matches engine and hydraulic power to digging conditions to help conserve fuel without impacting production.
  • Save fuel with Automatic Engine Control (AEC). It reduces engine speed when the machine is not under load to minimize fuel consumption.

Reliable Performance

  • A versatile machine that performs well in bucket and hammer applications.
  • Booms and sticks are robotically welded and checked ultrasonically to ensure maximum durability.
  • Reliable and durable and built on classic, proven components.
  • The Cat C4.4 engine and electrohydraulic system work in sync to help you move plenty of material while using less fuel.
  • Fast cycle times give you excellent productivity.
  • A hammer-ready valve is standard for added versatility.
  • Two levels of fuel filtration protect the engine from contaminated diesel fuel.
  • Cat undercarriage is built strong to absorb jobsite stresses for enhanced performance and durability.
  • General duty buckets are designed for fast material discharge and cleaning.
  • Work up to 4500 m (14,760 ft) above sea level with engine power derate above 3000 m (9,840 ft).
  • Standard high-ambient temperature capability is 52°C (125°F) with cold start capability at -25°C (-13°F).

Work in Comfort

  • The cab has a wide seat that adjusts to suit individual operator preferences.
  • Standard automatic climate control helps keep you comfortable all shift long.
  • Excellent work site visibility from the cab enhances productivity and safety.
  • Optimized low-effort joystick controls reduce operator fatigue.
  • Convenience features include a radio, auxiliary port for headphones, and a USB port for connecting and charging devices; a 24V DC outlet makes phone charging even faster.
  • Use the radio’s Bluetooth® technology to make hands-free calls.
  • The cup holder and storage space in front of the controls can hold large cups and wide cell phones; storage behind the seat can hold a large lunchbox and other items.

Enhanced Safety

  • Access daily maintenance points from ground level with the exception of the engine oil level – no need to climb on top of the excavator to check filters or grease linkage.
  • An optional ISO certified Rollover Protective Structure (ROPS) cab is offered in some regions to help protect the operator in the event of a rollover.
  • Enjoy great visibility into the trench, in each swing direction, and behind you with the help of smaller cab posts and larger windows.
  • An optional rearview camera enhances visibility.
  • Anti-skid plating on the service platform helps prevent slipping.
  • The handrails meet ISO 2867:2011 requirements for added safety.
  • Keep your excavator secure with Operator ID. Use your PIN code on the monitor to enable the push button starting feature.
  • Enhance jobsite safety. Add a swing alarm to alert people when you're rotating from trench to stockpile and back again.

Standard Equipment

  • NOTE
    • Standard and optional equipment may vary. Consult your Cat dealer for details.
    • 5.7 m (18'8") Reach boom
  • CAB
    • Sound suppressed with viscous mounts
    • High-resolution 203 mm (8") LCD touch screen monitor
    • Mechanically adjustable seat with headrest and armrest
    • 51 mm (2") orange seat belt
    • Auto bi-level air conditioner
    • Keyless push-to-start engine control
    • Fixed left-side console
    • 1 button joysticks
    • Bluetooth® radio with USB/Aux ports
    • 24V DC outlet
    • Cup holder and storage compartments
    • 70/30 tempered glass windshield
    • Rear window emergency exit
    • Upper radial wiper with washer
    • Openable steel hatch
    • LED Dome light
    • Washable floor mat
    • VisionLink®
    • Capability to Remote Flash Cat Product Link™ (telematics only)
    • Maintenance-free 950 CCA batteries (x2)
    • Electrical disconnect switch
    • LED chassis and cab lights
    • LED left-side boom light
    • Cat C4.4 single turbo diesel engine
    • Two selectable modes: Power, Smart
    • Up to 4500 m (14,760 ft) altitude capability
    • 52°C (125° F) high-ambient cooling capacity
    • -25°C (-13° F) cold start capability
    • Electric fuel priming pump
    • Two-stage fuel filtration system
    • Sealed double element air filter with integrated pre-cleaner
    • Electronic main control valve, hammer ready
    • Back-to-back electronic pumps
    • Boom and stick regeneration circuits
    • Automatic hydraulic oil warmup
    • Automatic two-speed travel
    • High performance hydraulic return filter
    • Anti-skid plating with countersunk bolts
    • Handrail and hand hold
    • Lockable external tool/storage box
    • Signaling/warning horn
    • Hydraulic lockout lever
    • Lockable disconnect switch
    • Grouped engine oil and fuel filters
    • Scheduled Oil Sampling (S·O·S℠) ports
    • Grease lubricated track link
    • Center track guiding guard
    • Bottom guards
    • Travel motor guards
    • 3600 kg (7,940 lb) counterweight
    • Tie-down points

Optional Equipment

  • NOTE
    • Standard and optional equipment may vary. Consult your Cat dealer for details.
    • 2.5 m (8'2") Reach stick
    • 2.7 m (8'9") Reach stick
  • CAB
    • 3 button joysticks
    • VisionLink Productivity
    • LED right-side boom light
    • Hammer lines
    • Hammer return filter
    • FOGS with matching lights
    • Rearview camera
    • Rear- and right-side-view cameras (mandatory for Kingdom of Saudi Arabia; not available in other regions)
    • Rollover protective structure (ROPS) (mandatory for Kingdom of Saudi Arabia; optional in Africa, Middle East, South America; not available in other regions)
    • Travel alarm (standard in South America)
    • Swing alarm
    • Radiator screen
    • 600 mm (24") triple grouser track shoes
    • 790 mm (31") triple grouser track shoes