309 CR VAB Mini Hydraulic Excavator

The Cat® 309 CR Variable Angle Boom (VAB) Mini Excavator delivers maximum power and performance in a mini size to help you work in a wide range of applications. The Variable Angle Boom provides the maximum in linkage flexibility in tight applications.

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Net Power 70.3HP
Engine Model Cat C3.3B
Bore 3.7in
Rated Net Power - 2,200 rpm - EU Stage V - ISO 9249/EEC 80/1269 71.5HP
Gross Power - ISO 14396 74.3HP
Displacement 203in³
Rated Net Power - 2,200 rpm - U.S. EPA Tier 4 Final - ISO 9249/EEC 80/1269 70.3HP
Stroke 4.7in


Operating Weight 20731lb
Note *Maximum Weight is based on steel tracks with rubber pads, counterweight, operator, full fuel tank, standard stick, blade and no bucket.
Note (2) **Maximum Weight is based on steel tracks with rubber pads, counterweight, operator, full fuel tank, long stick, blade and no bucket.
Note (1) *Minimum Weight is based on steel tracks, no counterweight, operator, full fuel tank, standard stick, blade and no bucket.
Maximum Operating Weight with Cab* 21054lb
Maximum Operating Weight with Cab** 20731lb
Minimum Operating Weight with Cab* 19304lb

Dimensions - VAB In

Dig Depth 154.8in
Boom Swing Left 24in
Cab Height 99in
Maximum Blade Depth 26.9in
Maximum Blade Height 13.5in
Stick Length 71.8in
Maximum Reach 260.3in
Tail Swing without Counterweight 57.1in
Vertical Wall 133.6in
Swing Bearing Height 31.4in
Track Belt/Shoe Width 17.7in
Boom Swing Right 37in
Overall Track Width 97.2in
Overall Shipping Length 227.2in
Maximum Dump Clearance 143.4in
Boom in Reach 112.3in
Maximum Reach at Ground Level 252.1in
Transport Height 99.6in
Overall Undercarriage Length 126in
Ground Clearance 13.5in
Tail Swing with Counterweight 64.8in
Maximum Dig Height 216.3in


Height 17in
Width - Standard 97.2in
Width - Wide 103.9in

Dimensions - VAB Out

Maximum Blade Height 13.5in
Boom Swing Right 37in
Boom Swing Left 24in
Transport Height 96.5in
Dig Depth 136.5in
Ground Clearance 13.5in
Cab Height 99in
Boom in Reach 117.9in
Vertical Wall 138.7in
Swing Bearing Height 31.4in
Maximum Dump Clearance 251.6in
Overall Undercarriage Length 126in
Maximum Reach at Ground Level 304.4in
Tail Swing without Counterweight 57.1in
Maximum Reach 311in
Track Belt/Shoe Width 17.7in
Overall Shipping Length 281.8in
Maximum Blade Depth 26.9in
Maximum Dig Height 321.7in
Overall Track Width 97.2in
Tail Swing with Counterweight 64.8in
Stick Length 71.8in

Hydraulic System

Operating Pressure - Equipment 4134psi
Operating Pressure - Travel 4134psi
Auxiliary Circuit - Secondary - Flow 9gal/min
Auxiliary Circuit - Primary (High Flow) - Pressure 4134psi
Type Load Sensing Hydraulics with Variable Displacement Piston Pump
Digging Force - Stick - Standard 9500lb
Auxiliary Circuit - Secondary - Pressure 4134psi
Digging Force - Stick - Long 8023lb
Digging Force - Bucket 13943lb
Pump Flow at 2,400 rpm 62gal/min
Auxiliary Circuit - Primary (High Flow) - Flow 37gal/min
Operating Pressure - Swing 3626psi

Dimensions - Long Stick

O/A Shipping Length 262.3in
Maximum Dig Height 276.8in
Maximum Dump Clearance 199.4in
Maximum Blade Depth 26.9in
Boom Swing - Right 37in
Boom Swing - Left 24in
Dig Depth 183.1in
Stick Length 92.8in
Maximum Reach - Ground Level 293.8in
Maximum Blade Height 13.5in
Cab Height 99in
Transport Height 99in
Boom In Reach 126.6in
O/A Track Width 97.2in
Ground Clearance 13.5in
Swing Bearing - Height 28.7in
Tail Swing without Counterweight 57.1in
Tail Swing with Counterweight 64.8in
Maximum Reach 300.7in
Track Belt/Shoe Width 17.7in
Vertical Wall 134.3in
O/A Undercarriage Length 126in

Dimensions - Standard Stick

O/A Undercarriage Length 126in
Maximum Reach - Ground Level 273.6in
Swing Bearing - Height 28.7in
Stick Length 71.8in
O/A Shipping Length 259in
Maximum Blade Height 13.5in
Boom In Reach 120.4in
Tail Swing with Counterweight 64.8in
Vertical Wall 118in
Maximum Blade Depth 26.9in
Ground Clearance 13.5in
Maximum Reach 281.1in
Transport Height 97.9in
Cab Height 99in
Boom Swing - Left 24in
O/A Track Width 97.2in
Boom Swing - Right 37in
Maximum Dig Height 264.9in
Tail Swing without Counterweight 57.1in
Dig Depth 162in
Maximum Dump Clearance 187.1in
Track Belt/Shoe Width 17.7in

Travel System

Gradeability - Maximum 30 degrees
Ground Pressure - Minimum Weight 6psi
Travel Speed - High 3.1mile/h
Maximum Traction Force - High Speed 6497lb
Travel Speed - Low 1.6mile/h
Ground Pressure - Maximum Weight 6psi
Maximum Traction Force - Low Speed 19064lb

Air Conditioning System

Air Conditioning The air conditioning system on this machine contains the fluorinated greenhouse gas refrigerant R134a (Global Warming Potential = 1430). The system contains 1.0 kg of refrigerant which has a CO2 equivalent of 1.430 metric tonnes.


Note European Union Directive “2000/14/EC”
Average Exterior Sound Pressure (ISO 6395:2008) 99dB(A)
Operator Sound Pressure (ISO 6396:2008) 72dB(A)

Certification - Cab

Tip Over Protective Structure (TOPS) ISO 12117:1997
Top Guard ISO 10262:1998 (Level II)
Roll Over Protective Structure (ROPS) ISO 12117-2:2008

Service Refill Capacities

Fuel Tank 39gal (US)
Hydraulic System 28gal (US)
Engine Oil 3gal (US)
Cooling System 2.6gal (US)
Hydraulic Tank 14gal (US)

Swing System

Machine Swing Speed 10.6r/min

Weight Increase from Minimum Configuration

Steel Tracks with Pads 728lb
Long Stick 146lb
Counterweight 552lb


Note The 309 CR specifications are based on a machine configured with a Long (L) Undercarriage. For specifications representing a 309 CR with a Standard Undercarriage, please refer to the 308 CR information.

Standard Equipment

  • Extended Life Coolant, –37° C (–35° F)
  • Ecology Drain
  • Cat C3.3B Diesel Engine (U.S. EPA Tier 4 Final/EU Stage V) – Electronic Engine, Turbo, Diesel Particulate Filter (DPF)
  • Automatic Two Speed Travel
  • Automatic Engine Shutdown
  • Radial Seal – Double Element Air Filter
  • Automatic Swing Brake
  • Automatic Engine Idle
  • Fuel Water Separator with Indicator
  • Case Drain Line
  • Hydraulic Temperature Monitoring
  • Hydro Advanced Hydraulic Oil
  • Certified Accumulator
  • Power On Demand
  • Variable Displacement Piston Pump
  • Load Sensing/Flow Sharing Hydraulics
  • Smart Tech Electronic Pump
Operator Environment
  • Rear Window Emergency Exit
  • Assisted Front Window Overhead Storage
  • 12V Power Socket
  • Travel Pedals and Hand Levers
  • Travel Cruise Control
  • LED Interior Light
  • Coat Hook
  • Cat Key with Passcode Option
  • Fabric, High Back, Suspension Seat
  • Stick Steer Mode
  • ROPS – ISO 12117-2:2008
  • Removable, Washable Floor Mat
  • Literature Holder
  • Color LCD Monitor
    – Fuel Level and Coolant Temperature Gauges
    – Maintenance and Machine Monitoring
    – Performance and Machine Adjustments
    – Numeric Security Code
    – Multiple Languages
    – Camera Ready
    – Hour Meter with Wake Up Switch
    – Jog Dial Control Interface
  • Mounting Bosses for Top and Front Guards
  • Sealed and Pressurized Cab
  • Radio – Bluetooth®, USB, Auxiliary, Microphone
  • Skylight
  • Integrated Lower Front Window
  • HVAC with Automatic Temperature Control
  • Retractable Seat Belt (75 mm/3 in)
  • TOPS – ISO 12117:1997
  • Top Guard – ISO 10262:1998 (Level II)
  • Cup Holder
  • Hydraulic Lockout Controls
  • Control Pattern Changer
  • Operator Sound Pressure 72 dB(A) ISO 6396:2008
  • Molded Footrests
  • Adjustable Wrist Rests
  • Tie Down Eyes on Track Frame
  • Dozer Blade
  • Dozer Float
  • Bolt-on, Reversible Wear Edge
  • Steel Tracks (450 mm/17.7 in wide)
  • Hydraulic Track Adjusters
  • Greased and Lubricated Track
Boom, Stick And Linkages
  • Variable Angle Boom
  • Standard Stick (1823 mm/71.8 in)
  • Front Shovel Capable (Pin-On/Manual Coupler/Hydraulic Coupler – not available in all regions)
  • Thumb Ready (not available in all regions)
  • Certified Lifting Eye (not available in all regions)
  • 12 Volt Electrical System
  • 90 Ampere Alternator
  • 850 CCA Maintenance Free Battery
  • Circuit Breaker
  • Ignition Key Stop Switch
  • Signaling/Warning Horn
  • Product Link Elite Lite (regulations apply)

Optional Equipment

Operator Environment
  • Air Suspension Heated Seat
  • Rain Visor
  • Rearview Camera
  • Rotating Beacon
  • Boom and Stick Hose Burst Check Valves
  • Bucket Linkage with Lift Eye
  • Track Guides
  • Attachments including Buckets, Augers and Hammers
  • Wide Steel Tracks (600 mm/23.6 in)
  • 2nd Auxiliary Hydraulic Lines
  • Wide Dozer Blade
  • Additional Counterweight
  • Water Jacket Heater
  • Refueling Pump
  • Cab Guarding
  • Travel Alarm (standard in some regions)