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323 Hydraulic Excavator

Net Power - ISO 9249

172 HP

Operating Weight

55100 lb

Maximum Digging Depth

22.1 ft


The Cat® 323 delivers power, speed, and high production performance. With more standard technology than previous models, plus reduced fuel and maintenance costs, the Cat 323 has all you need to take your business to the next level.



  • 320 Family Introduction Video
  • Next Generation Excavator Cat® Connect Technology
  • Cat® Next Generation Excavators: Walkaround 320 Size Class
  • Cat® Next Generation Excavators: Vision
  • Cat® Next Generation Excavators: Manufacturing
  • Cat® Next Generation Excavators: Design
  • Stick Steer for Cat® Excavators

360° View


360° exterior view. Double click on the image to zoom in on any area of the product.


360° interior view. Double click on the image to zoom in on any area of the product.


Virtual Product Tour. Double click on the hotspots to see in on any area of the product.



  • Engine
    Spec Value
    Net Power - ISO 9249 172 HP
    Net Power - ISO 9249 (DIN) 175 hp (metric)
    Engine Model Cat C7.1
    Engine Power - ISO 14396 174 HP
    Engine Power - ISO 14396 (DIN) 176 hp (metric)
    Bore 4 in
    Stroke 5 in
    Displacement 428 in³
    Biodiesel Capability Up to B20¹
    Emissions Meets U.S. EPA Tier 4 Final, EU Stage V, and Japan 2014 emission standards.
    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 2,200 rpm. Advertised power is tested per the specified standard in effect at the time of manufacture.
    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 (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. *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.
  • Hydraulic System
    Spec Value
    Main System - Maximum Flow 429 l/min (113 gal/min)
    Maximum Pressure - Equipment 5075 psi
    Maximum Pressure - Travel 4974 psi
    Maximum Pressure - Swing 3988 psi
  • Swing Mechanism
    Spec Value
    Swing Speed 11.25 r/min
    Maximum Swing Torque 60300 ft·lbf
  • Weights
    Spec Value
    Operating Weight 55100 lb
    Note Long undercarriage, Reach boom, R2.9 (9'6"), Reach stick, Heavy Duty (HD) 1.38 m³ (1.81 yd³) bucket, 790 mm (31") HD triple grouser track shoes and 5,400 kg (11,900 lb) counterweight.
  • Service Refill Capacities
    Spec Value
    Fuel Tank Capacity 86.6 gal (US)
    Cooling System 6.6 gal (US)
    Engine Oil 6.6 gal (US)
    Swing Drive - Each 1.6 gal (US)
    Final Drive - Each 1.3 gal (US)
    Hydraulic System - Including Tank 61.8 gal (US)
    Hydraulic Tank 30.4 gal (US)
    DEF Tank 10.8 gal (US)
  • Dimensions
    Spec Value
    Boom Reach 5.7 m (18'8")
    Stick Reach 2.9 m (9'6")
    Bucket HD 1.30 m³ (1.71 yd³)
    Shipping Height - Top of Cab 9.7 ft
    Handrail Height 9.7 ft
    Shipping Length 31.3 ft
    Tail Swing Radius 9.3 ft
    Counterweight Clearance 3.4 ft
    Ground Clearance 1.5 ft
    Track Length 14.6 ft
    Length to Center of Rollers 12 ft
    Track Gauge 7.8 ft
    Transport Width 10.4 ft
  • Working Ranges & Forces
    Spec Value
    Maximum Digging Depth 22.1 ft
    Boom Reach 5.7 m (18'8")
    Stick Reach 2.9 m (9'6")
    Bucket HD 1.30 m³ (1.71 yd³)
    Maximum Reach at Ground Level 32.4 ft
    Maximum Cutting Height 31 ft
    Maximum Loading Height 21.3 ft
    Minimum Loading Height 7.1 ft
    Maximum Depth Cut for 2440 mm (8 ft) Level Bottom 21.5 ft
    Maximum Vertical Wall Digging Depth 18.8 ft
    Bucket Digging Force - ISO 34308 lbf
    Stick Digging Force - ISO 26094 lbf
  • Air Conditioning System
    Spec Value
    Air Conditioning The air conditioning system on this machine contains the fluorinated greenhouse gas refrigerant R134a (Global Warming Potential = 1430). The system contains 0.85 kg (1.9 lb) of refrigerant which has a CO2 equivalent of 1.216 metric tonnes (1.340 tons).
  • Sustainability
    Spec Value
    Recyclability 98%

Standard Equipment


  • Standard and optional equipment may vary. Consult your Cat dealer for details.


  • Rollover protective structure (ROPS)
  • Air-adjustable seat with heat (Deluxe only)
  • Auto-adjustable seat with heat and air ventilation (Premium only)
  • High-resolution 254 mm (10 in) LCD touchscreen monitor


  • VisionLink®
  • Remote Flash
  • Remote Troubleshoot
  • Cat Grade 2D
  • Cat Assist
  • Cat Payload


  • Two 1,000 CCA maintenance-free batteries
  • Programmable time-delay LED working lights
  • LED chassis light, left-hand/right-hand boom lights, cab lights


  • Cat 7.1 single turbo diesel engine
  • Three selectable power modes
  • Automatic engine speed control
  • 46°C (115°F) high-ambient cooling capacity (Europe only)
  • 52°C (125°F) high-ambient cooling capacity
  • -18°C (0°F) cold start capability
  • Double element air filter with integrated precleaner
  • Reversing electric cooling fans


  • Boom and stick regeneration circuits
  • Auto hydraulic warm up
  • Auto two-speed travel
  • Boom and stick drift reduction valve
  • Auto dig boost
  • Auto heavy lift


  • 2D E-Fence
  • Auto hammer stop
  • Rearview camera
  • Right-side-view camera
  • Lockable disconnect switch
  • Ground-level engine shutoff switch
  • Right-hand handrail and handhold
  • Signaling/warning horn


  • Sampling ports for Scheduled Oil Sampling (S·O·S℠)
  • Ground-level and platform-level engine oil dipsticks
  • Integrated vehicle health management system


  • Tie-down points on base frame

Optional Equipment


  • Standard and optional equipment may vary. Consult your Cat dealer for details.


  • 5.7 m (18'8") Reach boom
  • 5.7 m (18'8") HD Reach boom
  • 2.7 m (8'10") stub + 3.3 m (10'10") fore, Variable Angle boom
  • 8.85 m (29'0") Super Long Reach boom
  • 2.5 m (8'2") Reach stick
  • 2.9 m (9'6") Reach stick
  • 2.5 m (8'2") HD Reach stick (Chile, Turkey only)
  • 2.9 m (9'6") HD Reach stick (Chile, Turkey only)
  • 3.9 m (12'10") Reach stick
  • 2.9 m (9'6") HD Thumb Ready Reach stick
  • 6.28 m (20'7") Super Long Reach stick


  • Cat Stick Steer


  • VisionLink Productivity
  • Cat Grade Connectivity
  • Cat Grade 2D with Attachment Ready Option (ARO)
  • Cat Grade 3D single GNSS
  • Cat Grade 3D dual GNSS
  • Cat Tilt Rotator (TRS) Integration
  • Operator Coaching


  • -32°C (-25°F) cold start capability


  • Boom and stick lowering check valves
  • SmartBoom™ (Europe only)
  • Hammer return filter circuit
  • Advanced tool control (two pump, one/two way high-pressure flow)
  • Hydraulic efficiency monitoring
  • Medium-pressure circuit
  • Quick coupler circuit for Cat Pin Grabber


  • Cat Command (remote control)
  • 360° visibility
  • Inspection lighting


  • 600 mm (24") single grouser shoes
  • 600 mm (24") HD double grouser shoes
  • 600 mm (24") HD triple grouser shoes
  • 700 mm (28") HD triple grouser shoes
  • 790 mm (31") HD triple grouser shoes
  • 900 mm (35") HD triple grouser shoes
  • 4200 kg (9,300 lb) counterweight