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306 (7.0T)

306 (7.0T)

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Product specifications for 306 CR Mini Excavators

The Cat® 306 CR Mini Excavator delivers maximum power and performance in a mini size to help you work in a wide range of applications.


Net Power 41.7 kW
Gross Power - ISO 14396 43.2 kW
Displacement 2.43 l
Bore 87 mm
Stroke 102.4 mm
Engine Model Cat C2.4 Turbo
Net Power @ 2,200 rpm - U.S. EPA Tier 4 Final/EU Stage V - ISO 9249/EEC 80/1269 41.7 kW

Operating Weight 7150 kg
Minimum Operating Weight with Canopy* 6410 kg
Maximum Operating Weight with Canopy** 7090 kg
Note (2) **Maximum Weight is based on steel tracks with pads, extra counterweight, operator, full fuel tank, long stick, fixed blade and no bucket.
Maximum Operating Weight with Cab** 7150 kg
Minimum Operating Weight with Cab* 6470 kg
Note (1) *Minimum Weight is based on rubber tracks, operator, full fuel tank, standard stick, fixed blade and no bucket.
Weight Increase from Minimum Configuration

Counterweight 250 kg
Long Stick 44 kg
Steel Tracks with Pads 375 kg
Angle Blade 102 kg
XTC Carriage (no tool) 64 kg
Travel System

Ground Pressure - Minimum Weight 35.4 kPa
Ground Pressure - Maximum Weight 39.1 kPa
Gradeability - Maximum 30 degrees
Maximum Traction Force - High Speed 31 kN
Maximum Traction Force - Low Speed 56 kN
Travel Speed - High 5 km/h
Travel Speed - Low 2.8 km/h
Service Refill Capacities

Cooling System 10 l
Hydraulic System 104 l
Hydraulic Tank 53 l
Engine Oil 8 l
Fuel Tank 130 l
Hydraulic System

Operating Pressure - Travel 24500 kPa
Auxiliary Circuit - Primary - Flow 90 l/min
Digging Force - Bucket 51.5 kN
Auxiliary Circuit - Primary - Pressure 24500 kPa
Type Load Sensing Hydraulics with Variable Displacement Piston Pump
Auxiliary Circuit - Secondary - Flow 33 l/min
Operating Pressure - Equipment 24500 kPa
Auxiliary Circuit - Secondary - Pressure 24500 kPa
Digging Force - Stick - Standard 29.5 kN
Operating Pressure - Swing 22500 kPa
Digging Force - Stick - Long 26.5 kN
Pump Flow at 2,400 rpm 151 l/min
Swing System

Boom Swing - Right 65 degrees
Boom Swing - Left 60 degrees
Machine Swing Speed 11 r/min

Straight Blade Width 1980 mm
Angle Blade Width 1980 mm
Straight Blade Height 390 mm
Angle Blade Height 400 mm
Certification - Cab

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

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

Track Belt/Shoe Width 400 mm
Maximum Reach 6295 mm
Stick Length 1580 mm
Vertical Wall 2710 mm
Swing Bearing - Height 672 mm
Maximum Reach - Ground Level 6130 mm
Maximum Blade Height 415 mm
Ground Clearance 306 mm
Boom In Reach 2485 mm
Boom Swing - Right 910 mm
Transport Height 1755 mm
Tail Swing with Counterweight 1475 mm
Cab Height 2545 mm
Width over Upper House 1950 mm
Maximum Dump Clearance 4325 mm
Tail Swing without Counterweight 1350 mm
Boom Swing - Left 735 mm
O/A Undercarriage Length 2580 mm
Maximum Dig Height 5835 mm
Maximum Blade Depth 600 mm
O/A Track Width 1980 mm
Dig Depth 3710 mm
O/A Shipping Length 5975 mm
Dimensions - Long Stick

Dig Depth 4110 mm
Maximum Blade Height 415 mm
O/A Track Width 1980 mm
Track Belt/Shoe Width 400 mm
Tail Swing with Counterweight 1475 mm
Vertical Wall 3165 mm
Boom In Reach 2960 mm
Maximum Blade Depth 600 mm
Maximum Dig Height 6130 mm
Transport Height 2410 mm
Stick Length 1980 mm
Ground Clearance 306 mm
Swing Bearing - Height 672 mm
Width over Upper House 1950 mm
O/A Undercarriage Length 2580 mm
O/A Shipping Length 5950 mm
Cab Height 2545 mm
Maximum Reach 6685 mm
Boom Swing - Left 735 mm
Tail Swing without Counterweight 1350 mm
Boom Swing - Right 910 mm
Maximum Dump Clearance 4610 mm
Maximum Reach - Ground Level 6535 mm
Air Conditioning System

Air Conditioning The air conditioning system on this machine contains the fluorinated greenhouse gas refrigerant R134a (Global Warming Potential = 1287). The system contains 0.9 kg of refrigerant which has a CO2 equivalent of 1.287 metric tonnes.

Recyclability 96%


  • Your choice of a canopy (availability dependent on region) or a sealed and pressurized cab equipped with an improved air conditioning system, adjustable wrist rests and a suspension seat to help keep you working comfortably all day long.


  • Controls are easy to use and the intuitive Next Generation Monitor provides customizable machine operator preferences and easy to read machine information.


  • Moving around the job site is even easier with Cat Stick Steer. Easily switch from traditional travel controls with levers and pedals to joystick controls with a push of a button. The benefit of less effort and improved control is in your hands!


  • Increased lifting, swinging, travel and multi-functioning performance help you get the job done more efficiently.


  • Your safety is our top priority. The Cat Mini Excavator is designed to help keep you safe on the job. An optional back-up camera, courtesy work lights and a fluorescent retractable seat belt are just a few of the safety features we've built into the machine.


  • Maintenance is quick and easy on the Cat Mini Excavator. Routine check points are easy to access at ground level with grouped service points and robust service panels.


  • Equipped with features such as auto idle, auto engine shutdown, and efficient hydraulics with a variable displacement pump, the Cat Mini Excavator was designed with reducing your operating costs in mind.


  • Configure the machine to meet your specific application needs with a straight blade, angle blade, or Extra Tool Carrier (XTC).


  • Your Cat dealer is here to help you reach your business goals. From providing equipment solutions to operator training to service needs and beyond, your Cat dealer is ready to help.


  • The Cat® C2.4 engine meets U.S. EPA Tier 4 Final, EU Stage V, and Japan 2014 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.
  • Auto Idle helps reduce unnecessary fuel burn and greenhouse gas emissions by allowing the engine to automatically go into idle mode when the machine is not working.
  • Engine Idle Shutdown Timer reduces fuel burn, greenhouse gas emissions and unnecessary idle time by shutting down the machine after a pre-set idling period.
  • Cruise control helps you maintain a constant speed as you travel across your jobsite saving fuel and reducing greenhouse gas emissions.
  • The Cat® Seat Belt Reminder provides audible and visual warnings to remind operators to buckle up during machine operation. The easy-to-install system is compatible with all equipment brands to help ensure operator safety.
  • Extended maintenance intervals not only reduce downtime but decrease the amount of fluid and filters that are replaced over the life of the machine.
  • 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.(if equipped)
  • 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.(if equipped)
  • Cat Grade with advanced 2D and 3D 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. (if equipped).
*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)
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