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.
Features
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ALL DAY COMFORT
- 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.
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EASY TO OPERATE
- Controls are easy to use and the intuitive Next Generation Monitor provides customizable machine operator preferences and easy to read machine information.
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STICK STEER TRAVEL MODE
- 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!
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BIG PERFORMANCE IN A MINI DESIGN
- Increased lifting, swinging, travel and multi-functioning performance help you get the job done more efficiently.
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SAFETY ON THE JOB SITE
- 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.
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SIMPLE SERVICE FOR LESS DOWNTIME
- 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.
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LOWER OPERATING COSTS
- 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.
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CHOICES
- Configure the machine to meet your specific application needs with a straight blade, angle blade, or Extra Tool Carrier (XTC).
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UNMATCHED DEALER SUPPORT
- 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.
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SUSTAINABILITY
- 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)
Specifications
Units for specifications
Engine
Net Power | 55.9 hp 41.7 kW |
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Gross Power - ISO 14396 | 57.9 hp 43.2 kW |
Displacement | 148 in³ 2.43 l |
Bore | 3.4 in 87 mm |
Stroke | 4 in 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 | 55.9 hp 41.7 kW |
Weights
Operating Weight | 15766 lb 7150 kg |
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Minimum Operating Weight with Canopy* | 14134 lb 6410 kg |
Maximum Operating Weight with Canopy** | 15633 lb 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** | 15766 lb 7150 kg |
Minimum Operating Weight with Cab* | 14266 lb 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 | 551 lb 250 kg |
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Long Stick | 97 lb 44 kg |
Steel Tracks with Pads | 827 lb 375 kg |
Angle Blade | 225 lb 102 kg |
XTC Carriage (no tool) | 141 lb 64 kg |
Travel System
Ground Pressure - Minimum Weight | 5.1 psi 35.4 kPa |
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Ground Pressure - Maximum Weight | 5.7 psi 39.1 kPa |
Gradeability - Maximum | 30 degrees |
Maximum Traction Force - High Speed | 6969 lbf 31 kN |
Maximum Traction Force - Low Speed | 12589 lbf 56 kN |
Travel Speed - High | 3.1 mile/h 5 km/h |
Travel Speed - Low | 1.7 mile/h 2.8 km/h |
Service Refill Capacities
Cooling System | 2.6 gal (US) 10 l |
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Hydraulic System | 27.5 gal (US) 104 l |
Hydraulic Tank | 14 gal (US) 53 l |
Engine Oil | 2.1 gal (US) 8 l |
Fuel Tank | 34.3 gal (US) 130 l |
Hydraulic System
Operating Pressure - Travel | 3553 psi 24500 kPa |
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Auxiliary Circuit - Primary - Flow | 24 gal/min 90 l/min |
Digging Force - Bucket | 11578 lbf 51.5 kN |
Auxiliary Circuit - Primary - Pressure | 3553 psi 24500 kPa |
Type | Load Sensing Hydraulics with Variable Displacement Piston Pump |
Auxiliary Circuit - Secondary - Flow | 9 gal/min 33 l/min |
Operating Pressure - Equipment | 3553 psi 24500 kPa |
Auxiliary Circuit - Secondary - Pressure | 3553 psi 24500 kPa |
Digging Force - Stick - Standard | 6632 lbf 29.5 kN |
Operating Pressure - Swing | 3263 psi 22500 kPa |
Digging Force - Stick - Long | 5957 lbf 26.5 kN |
Pump Flow at 2,400 rpm | 40 gal/min 151 l/min |
Swing System
Boom Swing - Right | 65 degrees |
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Boom Swing - Left | 60 degrees |
Machine Swing Speed | 11 r/min 11 r/min |
Blade
Straight Blade Width | 78 in 1980 mm |
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Angle Blade Width | 78 in 1980 mm |
Straight Blade Height | 15.4 in 390 mm |
Angle Blade Height | 15.7 in 400 mm |
Certification - Cab
Top Guard | ISO 10262:1998 (Level II) |
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Roll Over Protective Structure (ROPS) | ISO 12117-2:2008 |
Tip Over Protective Structure (TOPS) | ISO 12117:1997 |
Sound
Operator Sound Pressure (ISO 6396:2008) | 72 dB(A) 72 dB(A) |
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Average Exterior Sound Pressure (ISO 6395:2008) | 99 dB(A) 99 dB(A) |
Note | European Union Directive “2000/14/EC” |
Dimensions - Standard Stick
Track Belt/Shoe Width | 16 in 400 mm |
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Maximum Reach | 248 in 6295 mm |
Stick Length | 62 in 1580 mm |
Vertical Wall | 107 in 2710 mm |
Swing Bearing - Height | 27 in 672 mm |
Maximum Reach - Ground Level | 241 in 6130 mm |
Maximum Blade Height | 16 in 415 mm |
Ground Clearance | 12 in 306 mm |
Boom In Reach | 98 in 2485 mm |
Boom Swing - Right | 36 in 910 mm |
Transport Height | 69 in 1755 mm |
Tail Swing with Counterweight | 58 in 1475 mm |
Cab Height | 100 in 2545 mm |
Width over Upper House | 77 in 1950 mm |
Maximum Dump Clearance | 170 in 4325 mm |
Tail Swing without Counterweight | 53 in 1350 mm |
Boom Swing - Left | 29 in 735 mm |
O/A Undercarriage Length | 102 in 2580 mm |
Maximum Dig Height | 230 in 5835 mm |
Maximum Blade Depth | 24 in 600 mm |
O/A Track Width | 78 in 1980 mm |
Dig Depth | 146 in 3710 mm |
O/A Shipping Length | 235 in 5975 mm |
Dimensions - Long Stick
Dig Depth | 162 in 4110 mm |
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Maximum Blade Height | 16 in 415 mm |
O/A Track Width | 78 in 1980 mm |
Track Belt/Shoe Width | 16 in 400 mm |
Tail Swing with Counterweight | 58 in 1475 mm |
Vertical Wall | 125 in 3165 mm |
Boom In Reach | 117 in 2960 mm |
Maximum Blade Depth | 24 in 600 mm |
Maximum Dig Height | 241 in 6130 mm |
Transport Height | 95 in 2410 mm |
Stick Length | 78 in 1980 mm |
Ground Clearance | 12 in 306 mm |
Swing Bearing - Height | 27 in 672 mm |
Width over Upper House | 77 in 1950 mm |
O/A Undercarriage Length | 102 in 2580 mm |
O/A Shipping Length | 234 in 5950 mm |
Cab Height | 100 in 2545 mm |
Maximum Reach | 263 in 6685 mm |
Boom Swing - Left | 29 in 735 mm |
Tail Swing without Counterweight | 53 in 1350 mm |
Boom Swing - Right | 36 in 910 mm |
Maximum Dump Clearance | 182 in 4610 mm |
Maximum Reach - Ground Level | 257 in 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. |
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Sustainability
Recyclability | 96% |
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Standard Equipment
OPERATOR ENVIRONMENT – CAB AND CANOPY
- 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 ENVIRONMENT – CAB ONLY
- 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
UNDERCARRIAGE
- 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
BOOM, STICK AND LINKAGES
- 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
ELECTRICAL
- 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
OTHER
- Locks on External Enclosure Doors
- Lockable Fuel Cap
- Beacon Socket
- Rear Reflectors
Optional Equipment
OPERATOR ENVIRONMENT – CAB AND CANOPY
- 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
OPERATOR ENVIRONMENT – CAB ONLY
- Cab Heat Only
- Air Suspension Heated Seat
UNDERCARRIAGE
- Angle Blade
- Extra Tool Carrier (XTC)
- Steel Tracks (450 mm/17.7 in wide)
- Steel Track with Rubber Pads
BOOM, STICK AND LINKAGES
- 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
ELECTRICAL
- Product Link Elite (regulations apply)
- Camera
- Rotating Beacon
GUARDING
- 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
OTHER
- Additional Counterweight
- Water Jacket Heater
- Refueling Pump
Documents
- 306 CR Product Brochure
- Cat Mini Hydraulic Excavators Product Line Brochure (North America)
- Cat Mini Hydraulic Excavators Product Line Brochure (Europe)
- Options And Accessories Kit Guide for Mini Hydraulic Excavators
- Cat Attachments for Mini Excavators Brochure
- Attachment Compatibility Guide for Mini Excavators