306 CR Mini Excavator

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Net Power55.9 HP (41.7 kW)
Operating Weight15766 lb (7150 kg)
Dig Depth162 in (4110 mm)
Maximum Reach - Ground Level257 in (6535 mm)
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 Power55.9 HP (41.7 kW)
Operating Weight15766 lb (7150 kg)
Dig Depth162 in (4110 mm)
Maximum Reach - Ground Level257 in (6535 mm)
Transport Height69 in (1755 mm)
Maximum Blade Depth24 in (600 mm)
Maximum Dig Height230 in (5835 mm)
O/A Undercarriage Length102 in (2580 mm)
Boom Swing - Left29 in (735 mm)
Tail Swing without Counterweight53 in (1350 mm)
Maximum Dump Clearance170 in (4325 mm)
Width over Upper House77 in (1950 mm)
Cab Height100 in (2545 mm)
Tail Swing with Counterweight58 in (1475 mm)
Boom Swing - Right36 in (910 mm)
Dig Depth146 in (3710 mm)
Boom In Reach98 in (2485 mm)
Ground Clearance12 in (306 mm)
Maximum Blade Height16 in (415 mm)
Maximum Reach - Ground Level241 in (6130 mm)
Swing Bearing - Height27 in (672 mm)
Vertical Wall107 in (2710 mm)
Stick Length62 in (1580 mm)
Maximum Reach248 in (6295 mm)
Track Belt/Shoe Width16 in (400 mm)
NoteEuropean Union Directive “2000/14/EC”
O/A Track Width78 in (1980 mm)
O/A Shipping Length235 in (5975 mm)
Maximum Dump Clearance182 in (4610 mm)
Swing Bearing - Height27 in (672 mm)
Boom Swing - Right36 in (910 mm)
Tail Swing without Counterweight53 in (1350 mm)
Air ConditioningThe 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.
Boom Swing - Left29 in (735 mm)
Maximum Reach263 in (6685 mm)
Cab Height100 in (2545 mm)
O/A Shipping Length234 in (5950 mm)
O/A Undercarriage Length102 in (2580 mm)
Width over Upper House77 in (1950 mm)
Ground Clearance12 in (306 mm)
Operator Sound Pressure (ISO 6396:2008)72 dB(A) (72 dB(A))
Stick Length78 in (1980 mm)
Transport Height95 in (2410 mm)
Maximum Dig Height241 in (6130 mm)
Maximum Blade Depth24 in (600 mm)
Boom In Reach117 in (2960 mm)
Vertical Wall125 in (3165 mm)
Tail Swing with Counterweight58 in (1475 mm)
Track Belt/Shoe Width16 in (400 mm)
O/A Track Width78 in (1980 mm)
Maximum Blade Height16 in (415 mm)
Average Exterior Sound Pressure (ISO 6395:2008)99 dB(A) (99 dB(A))
Tip Over Protective Structure (TOPS)ISO 12117:1997
Gross Power - ISO 1439657.9 HP (43.2 kW)
Counterweight551 lb (250 kg)
Travel Speed - High3.1 mile/h (5 km/h)
Maximum Traction Force - Low Speed12589 lbf (56 kN)
Maximum Traction Force - High Speed6969 lbf (31 kN)
Gradeability - Maximum30 degrees
Ground Pressure - Maximum Weight5.7 psi (39.1 kPa)
Ground Pressure - Minimum Weight5.1 psi (35.4 kPa)
XTC Carriage (no tool)141 lb (64 kg)
Angle Blade225 lb (102 kg)
Steel Tracks with Pads827 lb (375 kg)
Long Stick97 lb (44 kg)
Note (1)*Minimum Weight is based on rubber tracks, operator, full fuel tank, standard stick, fixed blade and no bucket.
Cooling System2.6 gal (US) (10 l)
Minimum Operating Weight with Cab*14266 lb (6470 kg)
Maximum Operating Weight with Cab**15766 lb (7150 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 Canopy**15633 lb (7090 kg)
Minimum Operating Weight with Canopy*14134 lb (6410 kg)
Net Power @ 2,200 rpm - U.S. EPA Tier 4 Final/EU Stage V - ISO 9249/EEC 80/126955.9 HP (41.7 kW)
Engine ModelCat C2.4 Turbo
Stroke4 in (102.4 mm)
Bore3.4 in (87 mm)
Displacement148 in³ (2.43 l)
Travel Speed - Low1.7 mile/h (2.8 km/h)
Hydraulic System27.5 gal (US) (104 l)
Roll Over Protective Structure (ROPS)ISO 12117-2:2008
Operating Pressure - Swing3263 psi (22500 kPa)
Top GuardISO 10262:1998 (Level II)
Angle Blade Height15.7 in (400 mm)
Straight Blade Height15.4 in (390 mm)
Angle Blade Width78 in (1980 mm)
Straight Blade Width78 in (1980 mm)
Machine Swing Speed11 r/min (11 r/min)
Boom Swing - Left60 degrees
Boom Swing - Right65 degrees
Pump Flow at 2,400 rpm40 gal/min (151 l/min)
Digging Force - Stick - Long5957 lbf (26.5 kN)
Digging Force - Stick - Standard6632 lbf (29.5 kN)
Hydraulic Tank14 gal (US) (53 l)
Auxiliary Circuit - Secondary - Pressure3553 psi (24500 kPa)
Operating Pressure - Equipment3553 psi (24500 kPa)
Auxiliary Circuit - Secondary - Flow9 gal/min (33 l/min)
TypeLoad Sensing Hydraulics with Variable Displacement Piston Pump
Auxiliary Circuit - Primary - Pressure3553 psi (24500 kPa)
Digging Force - Bucket11578 lbf (51.5 kN)
Auxiliary Circuit - Primary - Flow24 gal/min (90 l/min)
Operating Pressure - Travel3553 psi (24500 kPa)
Fuel Tank34.3 gal (US) (130 l)
Engine Oil2.1 gal (US) (8 l)

Benefits and Features

  • 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)

Standard Equipment

  • Top Guard ISO 10262 1998 Level I
  • ROPS ISO 12117-2:2008
  • Stick Steer Mode
  • Travel Cruise Control
  • Control Pattern Changer
  • Adjustable Wrist Rests
  • Molded Footrests
  • Removable, Washable Floor Mat
  • Travel Pedals and Hand Levers
  • Cat Key with Passcode Option
  • Hydraulic Lockout Controls
  • High Back, Suspension Seat
  • Retractable Seat Belt (75 mm/3 in)
  • Coat Hook
  • Cup Holder
  • Literature Holder
  • Mounting Bosses for Top and Front Guards
  • Signaling/Warning Horn
  • Cab and (left side) Boom Work Lights
  • Utility Space for Mobile Phone
  • Next Generation Color LCD Monitor (IP66)
    – Fuel Level and Coolant Temperature Gauges
    – Maintenance and Machine Monitoring
    – Performance and Machine Adjustments
    – Numeric Security Code
    – Multiple Languages
    – Camera Ready (IP68 & IP69K)
    – Hour Meter with Wake Up Switch
  • Operator Sound Pressure 72 dB(A) ISO 6396:2008
  • HVAC with Automatic Temperature Control
  • Integrated Lower Front Window
  • Assisted Front Window Overhead Storage
  • Rear Window Emergency Exit
  • LED Interior Light
  • 12V Power Socket
  • Radio – Bluetooth®, Auxiliary, Microphone, USB (charging only)
  • Skylight
  • Jog dial interface
  • Greased and Lubricated Track
  • Hydraulic Track Adjusters
  • Tie Down Eyes on Track Frame
  • Dozer Straight Blade
  • Dozer Float
  • Bolt-on, Reversible Wear Edge
  • Rubber Tracks
  • One Piece Boom (3055 mm/120.3 in)
  • Standard Stick (1580 mm/62.2 in)
  • Front Shovel Capable – Pin-on/Manual Coupler/Hydraulic Coupler for Cat Tools
  • Thumb Ready
  • 12 Volt Electrical System
  • 90 Ampere Alternator
  • 650 CCA Maintenance Free Battery
  • Battery Disconnect
  • Circuit Breaker
  • Ignition Key Stop Switch
  • Signaling/Warning Horn
  • Product Link™ Basic (regulations apply)
  • Travel Alarm
  • Locks on External Enclosure Doors
  • Lockable Fuel Cap
  • Beacon Socket
  • Rear Reflectors

Optional Equipment

  • Rain Visor
  • Next Generation Advanced Monitor (below are all included with Next Generation Advanced Monitor option)
    – Touch Screen
    – Site Reference System
    – High Definition Camera Capable (IP68 & IP69K)
    – Numeric Security Code
  • Cab Heat Only
  • Air Suspension Heated Seat
  • Angle Blade
  • Extra Tool Carrier (XTC)
  • Steel Tracks (450 mm/17.7 in wide)
  • Steel Track with Rubber Pads
  • Long Stick (190 mm/78 in)
  • Attachments including Buckets, Augers and Hammers
  • 2nd Auxiliary Hydraulic Lines
  • Boom Lowering Check Valve
  • Stick Lowering Check Valve
  • Certified Lifting Eye
  • Product Link Elite (regulations apply)
  • Camera
  • Rotating Beacon
  • Heavy Duty Front Guard ISO 10262 1998 Level II
  • Mesh Front Guard ISO 10262 1998 Level I
  • Overhead Cab Guard ISO 10262 1998 Level II
  • Polycarbonate Front Window EN356 P5A (Cab Only)
  • Track Guards
  • Additional Counterweight
  • Water Jacket Heater
  • Refueling Pump