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Mini Excavators

Caterpillar serves all regions of the world so we build many different configurations of hydraulic excavators. Your Cat® dealer has exact machine specifications available in your area to help you choose what will best meet your needs.

304E2 CR Mini Hydraulic Excavator

The Cat® 304E2 CR Mini Hydraulic Excavator delivers efficient performance, durability and versatility in a compact design to help you work in a variety of applications.

  • Specification Summary

  • Engine Model Cat® C2.4
  • Net Power 30 kW
  • Rated Net Power - 2,200 rpm - ISO 9249/EEC 80/1269 30 kW
  • Weight - Canopy, Standard Stick 3925 kg
  • Product Brochure

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Product Details

Engine

Engine Model Cat® C2.4
Net Power 30 kW
Rated Net Power - 2,200 rpm - ISO 9249/EEC 80/1269 30 kW
Displacement 2.4 l
Bore 87 mm
Stroke 102.4 mm
Gross Power - ISO 14396 31.2 kW
Emissions *Meets U.S. EPA Tier 4 Final/EU Stage IIIA emission standards.

Weights*

Weight - Canopy, Standard Stick 3925 kg
Operating Weight 4080 kg
Weight - Cab, Long Stick 4080 kg
Weight - Canopy, Long Stick 3955 kg
Note *Weight includes counterweight, rubber tracks, bucket, operator, full fuel and auxiliary lines.
Weight - Cab, Standard Stick 4050 kg

Travel System

Travel Speed - High 5.2 km/h
Maximum Traction Force - Low Speed 31 kN
Maximum Traction Force - High Speed 16.9 kN
Travel Speed - Low 3.3 km/h
Ground Pressure - Cab 29.5 kPa
Ground Pressure - Canopy 28.1 kPa
Gradeability - Maximum 30°

Hydraulic System

Auxiliary Circuit - Secondary (174 bar/2,524 psi) 25 l/min
Digging Force - Stick - Long 19.5 kN
Pump Flow at 2,200 rpm 100 l/min
Operating Pressure - Equipment 245 bar
Auxiliary Circuit - Primary (186 bar/2,734 psi) 70 l/min
Operating Pressure - Swing 216 bar
Digging Force - Stick - Standard 21.6 kN
Operating Pressure - Travel 245 bar
Digging Force - Bucket 37.8 kN
Type Load Sensing Hydraulics with Variable Displacement Piston Pump

Swing System

Machine Swing Speed 10 r/min
Boom Swing - Right 50°
Boom Swing - Left - Without Stop* 70°
Boom Swing - Left - With Stop* 55°
Note *Automatic swing brake, spring applied, hydraulic release.

Blade

Width 1950 mm
Height 325 mm
Dig Depth 470 mm
Lift Height 400 mm

Service Refill Capacities

Cooling System 5.5 l
Engine Oil 9.5 l
Hydraulic Tank 42.3 l
Fuel Tank 46 l
Hydraulic System 65 l

Operating Specifications

Machine Overhang 0 mm
Stick Length - Standard 1315 mm
Stick Length - Long 1615 mm

Dimensions - Long Stick

Boom In Reach 2220 mm
O/A Track Width 1950 mm
O/A Shipping Length 4930 mm
Vertical Wall 2560 mm
Dig Depth 3430 mm
Maximum Dump Clearance 3690 mm
Swing Bearing - Height 565 mm
Maximum Blade Height 400 mm
Maximum Blade Depth 470 mm
O/A Undercarriage Length 2220 mm
Tail Swing 975 mm
O/A Shipping Height 2500 mm
Maximum Reach - Ground Level 5470 mm
Boom Swing - Right 735 mm
Maximum Dig Height 5070 mm
Boom Height - Shipping Position 1770 mm
Track Belt/Shoe Width 350 mm
Boom Swing - Left 670 mm
Maximum Reach 5590 mm

Dimensions - Standard Stick

Boom Height - Shipping Position 1480 mm
Boom Swing - Left 670 mm
O/A Shipping Height 2500 mm
Maximum Reach 5350 mm
O/A Undercarriage Length 2220 mm
Tail Swing 975 mm
O/A Track Width 1950 mm
O/A Shipping Length 4820 mm
Dig Depth 3130 mm
Vertical Wall 2420 mm
Maximum Dig Height 4980 mm
Boom In Reach 2110 mm
Maximum Dump Clearance 3590 mm
Swing Bearing - Height 565 mm
Maximum Reach - Ground Level 5220 mm
Track Belt/Shoe Width 350 mm
Boom Swing - Right 735 mm
Maximum Blade Depth 470 mm
Maximum Blade Height 400 mm

Lift Capacities at Ground Level - Lift Point Radius: 3000 mm (118 in)

Blade Down - Side 910 kg
Blade Up - Side 820 kg
Blade Down - Front 1570 kg
Blade Up - Front 820 kg

Lift Capacities at Ground Level - Lift Point Radius: 4500 mm (177 in)

Blade Up - Front 430 kg
Blade Down - Front 860 kg
Blade Down - Side 480 kg
Blade Up - Side 430 kg

Cab

Dynamic Operator Sound Pressure Level (ISO 6396:2008) 81 dB(A)
Note *European Union Directive “2000/14/EC”
Exterior Sound Power Level - ISO 6395:2008* 96 dB(A)

Certification - Cab and Canopy

Tip Over Protective Structure (TOPS) ISO 12117
Top Guard ISO 10262 (Level I)
Roll Over Protective Structure (ROPS) ISO 12117-2

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 1.4 metric tonnes.

Undercarriage

Track Roller Type Center Flange
Number of Carrier Rollers 1
Number of Track Rollers 4

QUALITY

The durable hoods and frame and the compact radius design of the 304E2 let you work comfortably and confidently in confined areas. The operator environment includes a high quality suspension seat, easy to adjust armrests and 100% pilot controls which offer consistent and long-lasting controllability.

EFFICIENCY

High Definition Hydraulic System provides a load sensing and flow sharing capability leading to operational precision, efficient performance and greater controllability. Power on Demand provides optimal efficiency and performance the moment you need it. This automatic system ensures fuel efficiency through appropriate engine rating to meet all operational needs as required.

VERSATILITY

Broad range of Cat Work Tools make the Cat Mini Excavator a versatile machine able to meet the requirements of any job site. Over 200 degrees of bucket rotation provides greater material retention during truck loading and easier flat wall digging without having to reposition the machine.

PERFORMANCE

Front shovel bucket orientation provides the operator with more ways to get the job done faster. COMPASS Control Panel is a standard feature that allows the operator to easily adjust auxiliary flows to achieve the optimal work tool performance, activate auto idle or economy mode for improved fuel efficiency and utilize the security system to ensure protection of valuable assets with the simple touch of a button. The Site Reference System included in the COMPASS monitor provides output from pitch and roll sensors to aid in grading and level trenching. This impacts accuracy and productivity for job site finishing.

SERVICEABILITY

Front shovel bucket orientation provides the operator with more ways to get the job done faster. COMPASS Control Panel is a standard feature that allows the operator to easily adjust auxiliary flows to achieve the optimal work tool performance, activate auto idle or economy mode for improved fuel efficiency and utilize the security system to ensure protection of valuable assets with the simple touch of a button. The Site Reference System included in the COMPASS monitor provides output from pitch and roll sensors to aid in grading and level trenching. This impacts accuracy and productivity for job site finishing.

SAFETY

Front shovel bucket orientation provides the operator with more ways to get the job done faster. COMPASS Control Panel is a standard feature that allows the operator to easily adjust auxiliary flows to achieve the optimal work tool performance, activate auto idle or economy mode for improved fuel efficiency and utilize the security system to ensure protection of valuable assets with the simple touch of a button. The Site Reference System included in the COMPASS monitor provides output from pitch and roll sensors to aid in grading and level trenching. This impacts accuracy and productivity for job site finishing.
  • ENGINE
    •  Cat C2.4 diesel engine (meets U.S. EPA Tier 4 Final emission standards for North America and EU Stage IIIA/Tier 4 Interim emission standards for all other regions)
    •  Automatic engine idle
    •  Automatic engine shut-off
    •  Automatic two speed travel
    •  Diesel Particulate Filter (North America only)
    •  Diesel Oxidation Catalyst (North America only)
    •  Fuel and water separator
    •  Power on demand
  • HYDRAULIC SYSTEM
    •  1-way and 2-way (combined function)
    •  Accumulator
    •  Automatic swing parking brake
    •  Auxiliary hydraulic lines
    •  Adjustable auxiliary relief
    •  Auxiliary line quick disconnects
    •  Cat interlock system: hydraulic lockout
    •  Continuous auxiliary flow
    •  Ecology drain
    •  Hydraulic oil cooler
    •  High definition hydraulics
    •  Load sensing/flow sharing
  • OPERATOR ENVIRONMENT
    •  100% pilot control ergonomic joysticks
    •  Adjustable armrests
    •  COMPASS: complete, operation, maintenance, performance and security system<ul><li>Multiple languages</li></ul>
    •  Cup holder
    •  Hydraulic neutral lockout bar
    •  Literature holder
    •  Pattern changer (optional in Europe)
    •  Site reference system: leveling
    •  Tool storage area
    •  Travel control pedals with hand levers
    •  Washable floor mat
  • UNDERCARRIAGE
    •  Dozer blade with float function
    •  Track, rubber belt, 350 mm (14 in) width
    •  Tie down eyes on track frame
    •  Towing eye on base frame
  • FRONT LINKAGE
    •  200 degree bucket rotation
    •  Certified lifting eye on bucket linkage (optional in Europe)
    •  Front shovel capable
    •  Thumb ready stick
  • ELECTRICAL
    •  12 volt electrical system
    •  60 ampere alternator
    •  650 CCA maintenance free battery
    •  Fuse box
    •  Ignition key start/stop switch
    •  Slow blow fuse
    •  Warning horn
  • LIGHTS AND MIRRORS
    •  Boom light with time delay capability
  • SAFETY AND SECURITY
    •  Anti-theft system (COMPASS)
    •  Caterpillar Corporate “One Key” System
    •  Door locks
    •  Lockable fuel cap
    •  Retractable seat belt
    •  Roll Over Protective Structure (ROPS) (ISO 12117-2)
    •  Tip Over Protective Structure (TOPS) (ISO 12117)
    •  Top guard – ISO 10262 (Level 1)
    •  Travel alarm (optional in Europe)
  • ENGINE
    •  Engine block heater
  • HYDRAULIC SYSTEM
    •  Quick coupler lines
    •  Boom lowering check valve
    •  Stick lowering check valve
    •  Secondary auxiliary hydraulic lines
  • OPERATOR ENVIRONMENT
    •  Cab:<ul><li>Air conditioning</li><li>Heat</li><li>High back suspension seat</li><li>Interior light</li><li>Interlocking front window system</li><li>Radio</li><li>Windshield
  • Cab:
    • Air conditioning
    • Heat
    • High back suspension seat
    • Interior light
    • Interlocking front window system
    • Radio
    • Windshield
      • UNDERCARRIAGE
        •  Power angle blade
        •  Track, double grouser (steel), 350 mm (14 in)
      • FRONT LINKAGE
        •  Quick coupler: manual or hydraulic
        •  Thumb
        •  Buckets
        •  Full range of performance matched work tools<ul><li>Auger, hammer, ripper</li></ul>
      • LIGHTS AND MIRRORS
        •  Light, cab with time delay capability
        •  Mirror, canopy right
        •  Mirror, canopy left
        •  Mirror, cab rear
      • SAFETY AND SECURITY
        •  Battery disconnect
        •  Beacon socket
        •  Front wire mesh guard
        •  Rearview camera
        •  Vandal guard
      • TECHNOLOGY
        •  Product Link™

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