306 CR

306 CR Mini Hydraulic Excavator

The 306 CR Mini Excavator delivers power and performance in a 6 ton size class to help you work in a wide range of applications.

306 CR Mini Hydraulic Excavator

DESCRIPTION

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.

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.

The 306 CR Mini Excavator
The 306 CR Mini Excavator

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.

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!

The 306 CR Mini Excavator
The 306 CR Mini Excavator

BIG PERFORMANCE IN A MINI DESIGN

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

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.

The 306 CR Mini Excavator
The 306 CR Mini Excavator

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.

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.

The 306 CR Mini Excavator
The 306 CR Mini Excavator

CHOICES

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

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.

The 306 CR Mini Excavator

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)

  • Standard Equipment
  • Optional Equipment
  • Specs
  • Docs

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

Specs

Overview

Long Name:
306 CR Mini Hydraulic Excavator
Name:
306 CR
Brand:
Caterpillar
Status:
Current

Engine

Net Power
55.9 HP / 41.7 kW
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
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
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
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
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
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
Boom Swing - Left
60 degrees
Machine Swing Speed
11 r/min / 11 r/min

Blade

Straight Blade Width
78 in / 1980 mm
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)
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)
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
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
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.

Sustainability

Recyclability
96%