This model is no longer in production and is unavailable for purchase. It has been replaced by an upgraded version, which you can view here.
View new modelThe 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.
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Engine
- Net Power
- 40.2hp
- Engine Model
- Cat C2.4
- Gross Power - ISO 14396
- 41.8hp
- Bore
- 3.4in
- Stroke
- 4in
- Displacement
- 146in³
- Net Power - 2,200 rpm - ISO 9249/EEC 80/1269
- 40.2hp
- Note
- The Cat C2.4 meets U.S. EPA Tier 4 Final emission standards for North America, EU Stage V emission standards for Europe and Tier 4 Interim emission standards for all other regions.
Weights*
- Operating Weight
- 8996lb
- Weight - Cab, Standard Stick
- 8930lb
- Weight - Cab, Long Stick
- 8996lb
- Weight - Canopy, Standard Stick
- 8655lb
- Weight - Canopy, Long Stick
- 8721lb
Dimensions - Long Stick
- Dig Depth
- 135in
- Track Belt/Shoe Width
- 14in
- Boom Height - Shipping Position
- 70in
- Swing Bearing - Height
- 22in
- Maximum Dump Clearance
- 145in
- O/A Track Width
- 77in
- Maximum Blade Depth
- 19in
- Boom Swing - Right
- 29in
- Tail Swing
- 38in
- Boom In Reach
- 87in
- Boom Swing - Left
- 26in
- Maximum Blade Height
- 16in
- O/A Undercarriage Length
- 87in
- Maximum Reach - Ground Level
- 215in
- O/A Shipping Length
- 194in
- O/A Shipping Height
- 98in
- Vertical Wall
- 101in
- Maximum Reach
- 220in
- Maximum Dig Height
- 200in
Swing System
- Machine Swing Speed
- 10r/min
Blade
- Width
- 76.8in
- Height
- 12.8in
- Dig Depth
- 18.5in
- Lift Height
- 15.7in
Service Refill Capacities
- Cooling System
- 1.5gal (US)
- Engine Oil
- 2.5gal (US)
- Hydraulic Tank
- 11.2gal (US)
- Fuel Tank
- 12.2gal (US)
- Hydraulic System
- 17.2gal (US)
Dimensions - Standard Stick
- Vertical Wall
- 95in
- O/A Shipping Length
- 190in
- Maximum Reach - Ground Level
- 206in
- Maximum Blade Depth
- 19in
- Maximum Reach
- 211in
- O/A Shipping Height
- 98in
- O/A Undercarriage Length
- 87in
- Boom Height - Shipping Position
- 58in
- O/A Track Width
- 77in
- Maximum Blade Height
- 16in
- Track Belt/Shoe Width
- 14in
- Boom Swing - Right
- 29in
- Dig Depth
- 123in
- Tail Swing
- 38in
- Boom In Reach
- 83in
- Boom Swing - Left
- 26in
- Maximum Dump Clearance
- 141in
- Swing Bearing - Height
- 22in
- Maximum Dig Height
- 196in
Lift Capacities at Ground Level - Lift Point Radius: 3000 mm (118 in)
- Blade Down - Front
- 3462lb
- Blade Up - Front
- 1808lb
- Blade Down - Side
- 2007lb
- Blade Up - Side
- 1808lb
Travel System
- Ground Pressure - Canopy
- 4.1psi
- Ground Pressure - Cab
- 4.3psi
- Travel Speed - Low
- 2.1mile/h
- Travel Speed - High
- 3.2mile/h
- Maximum Traction Force - Low Speed
- 6969lb
- Maximum Traction Force - High Speed
- 3799lb
Operating Specifications
- Machine Overhang
- 0in
- Stick Length - Standard
- 52in
- Stick Length - Long
- 64in
Lift Capacities at Ground Level - Lift Point Radius: 4500 mm (177 in)
- Blade Up - Side
- 948lb
- Blade Down - Front
- 1896lb
- Blade Down - Side
- 1058lb
- Blade Up - Front
- 948lb
Hydraulic System
- Maximum Auxiliary Circuit - Primary - Flow at Pump
- 17.2gal/min
- Maximum Auxiliary Circuit - Secondary - Flow at Pump
- 6.6gal/min
- Pump Flow at 2,200 rpm
- 26.4gal/min
- Operating Pressure - Swing
- 3132psi
- Operating Pressure - Equipment
- 3553psi
- Operating Pressure - Travel
- 3553psi
- Digging Force - Stick - Standard
- 4856lb
- Note
- Flow and pressure are not combinable. Under load, as flow rises pressure goes down.
- Digging Force - Stick - Long
- 4384lb
- Maximum Auxiliary Circuit - Primary - Pressure at Pump
- 3553psi
- Digging Force - Bucket
- 8498lb
- Maximum Auxiliary Circuit - Secondary - Pressure at Pump
- 3553psi
Cab
- Dynamic Operator Sound Pressure Level (ISO 6396:2008)
- 81dB(A)
- Exterior Sound Power Level - ISO 6395:2008*
- 96dB(A)
Standard Equipment:
-
- Engine
-
- Cat C2.4 diesel engine (meets U.S. EPA Tier 4 Final emission standards for North America, EU Stage V emission standards for Europe and 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
- Multiple languages
- 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)
-
- Technology
-
- Product Link™
Optional Equipment:
-
- Engine
-
- Engine block heater
-
- Hydraulic System
-
- Quick coupler lines
- Boom lowering check valve
- Stick lowering check valve
- Secondary auxiliary hydraulic lines
-
- Operator Environment
-
- Cab:
- Air conditioning
- Heat
- High back suspension seat
- Interior light
- Interlocking front window system
- Radio
- Windshield wiper
- Cab:
-
- 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
- Auger, hammer, ripper
-
- 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
Specifications
Engine
- Net Power
- 40.2hp
- Engine Model
- Cat C2.4
- Gross Power - ISO 14396
- 41.8hp
- Bore
- 3.4in
- Stroke
- 4in
- Displacement
- 146in³
- Net Power - 2,200 rpm - ISO 9249/EEC 80/1269
- 40.2hp
- Note
- The Cat C2.4 meets U.S. EPA Tier 4 Final emission standards for North America, EU Stage V emission standards for Europe and Tier 4 Interim emission standards for all other regions.
Weights*
- Operating Weight
- 8996lb
- Weight - Cab, Standard Stick
- 8930lb
- Weight - Cab, Long Stick
- 8996lb
- Weight - Canopy, Standard Stick
- 8655lb
- Weight - Canopy, Long Stick
- 8721lb
Dimensions - Long Stick
- Dig Depth
- 135in
- Track Belt/Shoe Width
- 14in
- Boom Height - Shipping Position
- 70in
- Swing Bearing - Height
- 22in
- Maximum Dump Clearance
- 145in
- O/A Track Width
- 77in
- Maximum Blade Depth
- 19in
- Boom Swing - Right
- 29in
- Tail Swing
- 38in
- Boom In Reach
- 87in
- Boom Swing - Left
- 26in
- Maximum Blade Height
- 16in
- O/A Undercarriage Length
- 87in
- Maximum Reach - Ground Level
- 215in
- O/A Shipping Length
- 194in
- O/A Shipping Height
- 98in
- Vertical Wall
- 101in
- Maximum Reach
- 220in
- Maximum Dig Height
- 200in
Swing System
- Machine Swing Speed
- 10r/min
Blade
- Width
- 76.8in
- Height
- 12.8in
- Dig Depth
- 18.5in
- Lift Height
- 15.7in
Service Refill Capacities
- Cooling System
- 1.5gal (US)
- Engine Oil
- 2.5gal (US)
- Hydraulic Tank
- 11.2gal (US)
- Fuel Tank
- 12.2gal (US)
- Hydraulic System
- 17.2gal (US)
Dimensions - Standard Stick
- Vertical Wall
- 95in
- O/A Shipping Length
- 190in
- Maximum Reach - Ground Level
- 206in
- Maximum Blade Depth
- 19in
- Maximum Reach
- 211in
- O/A Shipping Height
- 98in
- O/A Undercarriage Length
- 87in
- Boom Height - Shipping Position
- 58in
- O/A Track Width
- 77in
- Maximum Blade Height
- 16in
- Track Belt/Shoe Width
- 14in
- Boom Swing - Right
- 29in
- Dig Depth
- 123in
- Tail Swing
- 38in
- Boom In Reach
- 83in
- Boom Swing - Left
- 26in
- Maximum Dump Clearance
- 141in
- Swing Bearing - Height
- 22in
- Maximum Dig Height
- 196in
Lift Capacities at Ground Level - Lift Point Radius: 3000 mm (118 in)
- Blade Down - Front
- 3462lb
- Blade Up - Front
- 1808lb
- Blade Down - Side
- 2007lb
- Blade Up - Side
- 1808lb
Travel System
- Ground Pressure - Canopy
- 4.1psi
- Ground Pressure - Cab
- 4.3psi
- Travel Speed - Low
- 2.1mile/h
- Travel Speed - High
- 3.2mile/h
- Maximum Traction Force - Low Speed
- 6969lb
- Maximum Traction Force - High Speed
- 3799lb
Operating Specifications
- Machine Overhang
- 0in
- Stick Length - Standard
- 52in
- Stick Length - Long
- 64in
Lift Capacities at Ground Level - Lift Point Radius: 4500 mm (177 in)
- Blade Up - Side
- 948lb
- Blade Down - Front
- 1896lb
- Blade Down - Side
- 1058lb
- Blade Up - Front
- 948lb
Hydraulic System
- Maximum Auxiliary Circuit - Primary - Flow at Pump
- 17.2gal/min
- Maximum Auxiliary Circuit - Secondary - Flow at Pump
- 6.6gal/min
- Pump Flow at 2,200 rpm
- 26.4gal/min
- Operating Pressure - Swing
- 3132psi
- Operating Pressure - Equipment
- 3553psi
- Operating Pressure - Travel
- 3553psi
- Digging Force - Stick - Standard
- 4856lb
- Note
- Flow and pressure are not combinable. Under load, as flow rises pressure goes down.
- Digging Force - Stick - Long
- 4384lb
- Maximum Auxiliary Circuit - Primary - Pressure at Pump
- 3553psi
- Digging Force - Bucket
- 8498lb
- Maximum Auxiliary Circuit - Secondary - Pressure at Pump
- 3553psi
Cab
- Dynamic Operator Sound Pressure Level (ISO 6396:2008)
- 81dB(A)
- Exterior Sound Power Level - ISO 6395:2008*
- 96dB(A)
Standard/Optional Features
Standard Equipment:
-
- Engine
-
- Cat C2.4 diesel engine (meets U.S. EPA Tier 4 Final emission standards for North America, EU Stage V emission standards for Europe and 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
- Multiple languages
- 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)
-
- Technology
-
- Product Link™
Optional Equipment:
-
- Engine
-
- Engine block heater
-
- Hydraulic System
-
- Quick coupler lines
- Boom lowering check valve
- Stick lowering check valve
- Secondary auxiliary hydraulic lines
-
- Operator Environment
-
- Cab:
- Air conditioning
- Heat
- High back suspension seat
- Interior light
- Interlocking front window system
- Radio
- Windshield wiper
- Cab:
-
- 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
- Auger, hammer, ripper
-
- 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