304 Mini Excavator
The Cat® 304 Mini Excavator delivers power and performance in a compact size to help you work in a wide range of applications.
Product Images
304 Mini Hydraulic Excavator
304 Mini Hydraulic Excavator
304 Mini Hydraulic Excavator
304 Mini Hydraulic Excavator
304 Mini Hydraulic Excavator
304 Mini Hydraulic Excavator
304 Mini Hydraulic Excavator
304 Mini Hydraulic Excavator
304 Mini Hydraulic Excavator
304 Mini Hydraulic Excavator
Product Videos
Introducing the Next Generation Cat 304 and 305 CR Mini Excavators
Overview of the Next Generation Cat 304 and 305 CR Mini Excavators
Standard Monitor on the Next Generation Cat Mini Excavators
Comparing the Next Generation Cat 304 and 305 CR Mini Excavators to the E2 Series
Advanced Monitor on the Next Generation Cat Mini Excavators
Cat 304 Mini Excavator Customer Story - Hilcon LLC (North Carolina, United States)
Virtual Product Tour (VPT)
360° Interior View (HTML5)
360° Exterior View (HTML5)
Specifications
| Name | Type | Value | Unit Value (Imperial) | Unit Name | Unit Value (Metric) | Unit Name (Metric) |
|---|---|---|---|---|---|---|
| Gross Power - ISO 14396 | measurement | 48.4 | hp | 36.1 | kW | |
| Gross Power - 2,400 rpm - SAE J1995:2014 | measurement | 48.4 | hp | 36.1 | kW | |
| Net Power | measurement | 45 | hp | 33.6 | kW |
Documents & Spec Sheets
304 Small Product Brochure (AUZ, EU, NACD)
Complete 304 Small Product Brochure (AUZ, EU, NACD)
DownloadCat Mini Hydraulic Excavators Product Line Brochure (North America)
DownloadCat Mini Hydraulic Excavators Product Line Brochure (Europe)
DownloadOptions And Accessories Kit Guide for Mini Hydraulic Excavators
Options And Accessories Kit Guide for Mini Hydraulic Excavators
DownloadCat Attachments for Mini Excavators Brochure
DownloadAttachment Compatibility Guide for Mini Excavators
DownloadFeatures & Benefits
ALL DAY COMFORT
- Choose either a canopy (not available in some regions) or a sealed and pressurized cab which can be equipped with air conditioning, adjustable wrist rests, and a suspension seat to help keep you working comfortably all day long.
EASY TO OPERATE
- Controls are easy to use and the intuitive Next Generation LCD monitor provides easy to read machine information. An advanced touchscreen monitor can also be equipped as an upgrade option.
STICK STEER TRAVEL MODE
- Moving around the job site is even easier with the Cat Stick Steer option. Easily switch from traditional travel controls with levers and pedals to joystick controls to move the machine and to operate the blade. The benefit of less effort and improved control is in your hands!
BIG PERFORMANCE IN A SMALL MACHINE
- Strong lift and dig performance helps you get the job done faster. The reduced radius tail swing design provides exceptional stability and performance. With a maximum width of 1700 mm (67 in), the 304 can access those hard to get into areas. Dozer float allows for easy clean up. An angle blade is also an option for finished grading and easier backfilling applications.
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. Courtesy work lights and a fluorescent retractable seat belt are just a couple of the safety features we’ve built into the machine.
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 through the side doors.
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.
SUSTAINABILITY
- The Cat® C1.7 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).
Complete Specifications
Engine
| Name | Type | Value | Unit Value (Imperial) | Unit Name | Unit Value (Metric) | Unit Name (Metric) |
|---|---|---|---|---|---|---|
| Gross Power - ISO 14396 | measurement | 48.4 | hp | 36.1 | kW | |
| Gross Power - 2,400 rpm - SAE J1995:2014 | measurement | 48.4 | hp | 36.1 | kW | |
| Net Power | measurement | 45 | hp | 33.6 | kW | |
| Engine Model | text | C1.7 Turbo | ||||
| Net Power - 2,400 rpm - ISO 9249, 80/1269/EEC | measurement | 45 | hp | 33.6 | kW | |
| Bore | measurement | 3.3 | in | 84 | mm | |
| Stroke | measurement | 3.9 | in | 100 | mm | |
| Displacement | measurement | 101 | in³ | 1.662 | l | |
| Emissions | text | Meets U.S. EPA Tier 4 Final and EU Stage V emission standards. | ||||
| Note | text | Net power advertised is the power available at the flywheel when the engine is at rated speed and rated power when the engine is installed with the factory configured fan, air intake system, exhaust system, and alternator with a minimum alternator load. | ||||
| Operating Weight | measurement | 9867 | lb | 4475 | kg | |
| Minimum Operating Weight with Canopy* | measurement | 8655 | lb | 3925 | kg | |
| Maximum Operating Weight with Canopy** | measurement | 9647 | lb | 4375 | kg | |
| Minimum Operating Weight with Cab* | measurement | 8875 | lb | 4025 | kg | |
| Maximum Operating Weight with Cab** | measurement | 9867 | lb | 4475 | kg | |
| Note (1) | text | *Minimum Weight is based on rubber tracks, operator, full fuel tank, standard stick, straight blade, no bucket and no extra counterweight. | ||||
| Note (2) | text | **Maximum Weight is based on steel tracks, operator, full fuel tank, long stick, straight blade, extra counterweight and no bucket. | ||||
| Counterweight | measurement | 496 | lb | 225 | kg | |
| Long Stick | measurement | 66 | lb | 30 | kg | |
| Steel Tracks | measurement | 430 | lb | 195 | kg | |
| Angle Blade | measurement | 243 | lb | 110 | kg | |
| Travel Speed - High | measurement | 3.2 | mile/h | 5.2 | km/h | |
| Travel Speed - Low | measurement | 2.2 | mile/h | 3.5 | km/h | |
| Maximum Traction Force - High Speed | measurement | 4271 | lbf | 19 | kN | |
| Maximum Traction Force - Low Speed | measurement | 7329 | lbf | 32.6 | kN | |
| Ground Pressure - Minimum Weight | measurement | 4.2 | psi | 28.7 | kPa | |
| Ground Pressure - Maximum Weight | measurement | 4.9 | psi | 33.8 | kPa | |
| Gradeability - Maximum | text | 30 degrees | ||||
| Cooling System | measurement | 2.9 | gal (US) | 11 | l | |
| Engine Oil | measurement | 1.6 | gal (US) | 6 | l | |
| Fuel Tank | measurement | 17 | gal (US) | 63 | l | |
| Hydraulic Tank | measurement | 14 | gal (US) | 52 | l | |
| Hydraulic System | measurement | 17 | gal (US) | 65 | l | |
| Tip Over Protective Structure (TOPS) | text | ISO 12117:1997 | ||||
| Type | text | Load Sensing Hydraulics with Variable Displacement Piston Pump | ||||
| Pump Flow at 2,400 rpm | measurement | 25 | gpm | 96 | L/min | |
| Operating Pressure - Equipment | measurement | 3553 | psi | 245 | bar | |
| Operating Pressure - Travel | measurement | 3553 | psi | 245 | bar | |
| Operating Pressure - Swing | measurement | 2611 | psi | 180 | bar | |
| Auxiliary Circuit - Primary - Flow | measurement | 21 | gpm | 65 | L/min | |
| Auxiliary Circuit - Primary - Pressure | measurement | 3553 | psi | 245 | bar | |
| Auxiliary Circuit - Secondary - Flow | measurement | 7 | gpm | 28 | L/min | |
| Auxiliary Circuit - Secondary - Pressure | measurement | 3553 | psi | 245 | bar | |
| Digging Force - Stick - Standard | measurement | 4721 | lbf | 21 | kN | |
| Digging Force - Stick - Long | measurement | 4316 | lbf | 19.2 | kN | |
| Digging Force - Bucket | measurement | 8588 | lbf | 38.2 | kN | |
| Note | text | Flow and pressure are not combinable. Under load, as flow rises pressure goes down. | ||||
| Machine Swing Speed | measurement | 9 | r/min | 9 | r/min | |
| Boom Swing - Left | text | 78 Degrees | ||||
| Boom Swing - Right | text | 50 Degrees | ||||
| Straight Blade Width | measurement | 66.9 | in | 1700 | mm | |
| Straight Blade Height | measurement | 14.2 | in | 360 | mm | |
| Angle Blade Width | measurement | 66.9 | in | 1700 | mm | |
| Angle Blade Height | measurement | 14.2 | in | 360 | mm | |
| Angle Blade - Left | text | 25 Degrees | ||||
| Angle Blade - Right | text | 25 Degrees | ||||
| Roll Over Protective Structure (ROPS) | text | ISO 12117-2:2008 | ||||
| Top Guard | text | ISO 10262:1998 (Level I) | ||||
| Dig Depth | measurement | 126.4 | in | 3210 | mm | |
| Vertical Wall | measurement | 94.3 | in | 2395 | mm | |
| Maximum Reach - Ground Level | measurement | 204.7 | in | 5200 | mm | |
| Maximum Reach | measurement | 209.8 | in | 5330 | mm | |
| Maximum Dig Height | measurement | 198.4 | in | 5040 | mm | |
| Maximum Dump Clearance | measurement | 143.5 | in | 3645 | mm | |
| Boom In Reach | measurement | 88.8 | in | 2255 | mm | |
| Tail Swing without Counterweight | measurement | 47.4 | in | 1205 | mm | |
| Tail Swing with Counterweight | measurement | 51.2 | in | 1300 | mm | |
| Maximum Blade Height | measurement | 16.5 | in | 420 | mm | |
| Maximum Blade Depth | measurement | 18.7 | in | 475 | mm | |
| Boom Height - Shipping Position | measurement | 63.8 | in | 1620 | mm | |
| O/A Shipping Height | measurement | 100 | in | 2540 | mm | |
| Swing Bearing - Height | measurement | 21.9 | in | 557 | mm | |
| O/A Undercarriage Length | measurement | 87 | in | 2210 | mm | |
| Overall Shipping Length* | measurement | 194.9 | in | 4950 | mm | |
| Boom Swing - Right | measurement | 28.7 | in | 730 | mm | |
| Boom Swing - Left | measurement | 20.9 | in | 530 | mm | |
| Track Belt/Shoe Width | measurement | 13.8 | in | 350 | mm | |
| Track Width | measurement | 66.9 | in | 1700 | mm | |
| Ground Clearance | measurement | 12 | in | 305 | mm | |
| Stick Length | measurement | 54.9 | in | 1395 | mm | |
| Note | text | *Overall Shipping Length depends on blade position during shipment. | ||||
| Dig Depth | measurement | 138.2 | in | 3510 | mm | |
| Vertical Wall | measurement | 99.8 | in | 2535 | mm | |
| Maximum Reach - Ground Level | measurement | 214.4 | in | 5445 | mm | |
| Maximum Reach | measurement | 219.3 | in | 5570 | mm | |
| Maximum Dig Height | measurement | 201.8 | in | 5125 | mm | |
| Maximum Dump Clearance | measurement | 147.2 | in | 3740 | mm | |
| Boom In Reach | measurement | 92.1 | in | 2340 | mm | |
| Tail Swing without Counterweight | measurement | 47.4 | in | 1205 | mm | |
| Tail Swing with Counterweight | measurement | 51.2 | in | 1300 | mm | |
| Maximum Blade Height | measurement | 16.5 | in | 420 | mm | |
| Maximum Blade Depth | measurement | 18.7 | in | 475 | mm | |
| Boom Height - Shipping Position | measurement | 75.2 | in | 1910 | mm | |
| O/A Shipping Height | measurement | 100 | in | 2540 | mm | |
| Swing Bearing - Height | measurement | 21.9 | in | 557 | mm | |
| O/A Undercarriage Length | measurement | 87 | in | 2210 | mm | |
| Overall Shipping Length* | measurement | 194.9 | in | 4950 | mm | |
| Boom Swing - Right | measurement | 28.7 | in | 730 | mm | |
| Boom Swing - Left | measurement | 20.9 | in | 530 | mm | |
| Track Belt/Shoe Width | measurement | 13.8 | in | 350 | mm | |
| Track Width | measurement | 66.9 | in | 1700 | mm | |
| Ground Clearance | measurement | 12 | in | 305 | mm | |
| Stick Length | measurement | 66.7 | in | 1695 | mm | |
| Note | text | *Overall Shipping Length depends on blade position during shipment. | ||||
| Air Conditioning | text | The air conditioning system on this machine contains the fluorinated greenhouse gas refrigerant R134a or R1234yf (Europe) (Global Warming Potential = 1430). See label or instruction manual for gas refrigerant identification. The system contains 0.75 kg (1.65 lb), 0.90 kg (1.98 lb) or 1.0 kg (2.20 lb) of refrigerant which has a CO2 equivalent of 1.430 metric tonnes (1.576 tons) for R134a and 0.001 tonnes (0.001 tons) for R1234yf (Europe). | ||||
| Operator Sound Pressure (ISO 6396:2008) | measurement | 76 | dB(A) | 76 | dB(A) | |
| Average Exterior Sound Pressure (ISO 6395:2008) | measurement | 97 | dB(A) | 97 | dB(A) | |
| Note | text | European Union Directive “2000/14/EC” | ||||
| Recyclability | text | 96% |
Standard Equipment
ENGINE
- Cat® C1.7 Turbo Engine (U.S. EPA Tier 4 Final/EU Stage V)
- Cat® C1.7 Turbo Engine (U.S. EPA Tier 4 Final/EU Stage V)
- Automatic Engine Idle
- Automatic Engine Idle
- Automatic Engine Shutdown
- Automatic Engine Shutdown
- Automatic Two Speed Travel
- Automatic Two Speed Travel
- Fuel Water Separator
- Fuel Water Separator
- Power on Demand (not available in all regions)
- Power on Demand (not available in all regions)
- Variable Displacement Piston Pump
- Variable Displacement Piston Pump
- Load Sensing/Flow Sharing Hydraulics
- Load Sensing/Flow Sharing Hydraulics
HYDRAULICS
- Smart Tech Electronic Pump
- Accumulator
- Smart Tech Electronic Pump
- Automatic Swing Brake
- Accumulator
- Auxiliary Hydraulic Lines
- Automatic Swing Brake
- One and Two Way Auxiliary Flow
- Auxiliary Hydraulic Lines
- Continuous Auxiliary Flow
- One and Two Way Auxiliary Flow
- Auxiliary Line Quick Disconnects
- Continuous Auxiliary Flow
- Auxiliary Line Quick Disconnects
OPERATOR ENVIRONMENT
- Canopy or Cab (Canopy not available in some regions)
- Stick Steer Mode
- Travel Cruise Control
- Canopy or Cab (Canopy not available in some regions)
- Control Pattern Changer (optional in some regions)
- Top Guard ISO 10262:1998 Level I
- Adjustable Wrist Rests
- ROPS – ISO 12117-2:2008
- Washable Floor Mat
- TOPS – ISO 12117:1997
- Travel Pedals and Hand Levers
- Stick Steer Mode
- Machine Security – Standard Key with Pass Code
- Travel Cruise Control
- Fabric Suspension Seat (Cab only)
- Control Pattern Changer (optional in some regions)
- Vinyl Suspension Seat (Canopy only)
- Adjustable Wrist Rests
- Hydraulic Lockout – All Controls
- Washable Floor Mat
- Retractable High Visibility Seat Belt (75 mm/3 in)
- Travel Pedals and Hand Levers
- Coat Hook
- Machine Security – Standard Key with Pass Code
- Cup Holder
- Fabric Suspension Seat (Cab only)
- Storage Pocket
- Vinyl Suspension Seat (Canopy only)
- Skylight
- Hydraulic Lockout – All Controls
- Mounting Bosses for Front
- Retractable High Visibility Seat Belt (75 mm/3 in)
- Signaling/Warning Horn
- Coat Hook
- Interior Light (Cab only)
- Cup Holder
- Boom Light, Halogen (not available in all regions)
- Storage Pocket
- Utility Space for Mobile Phone
- Skylight
- 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– Hour Meter with Wake Up Switch– Jog Dial (cab only)
- Mounting Bosses for Front
- Signaling/Warning Horn
- Interior Light (Cab only)
- Boom Light, Halogen (not available in all regions)
- 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– Hour Meter with Wake Up Switch– Jog Dial (cab only)
UNDERCARRIAGE
- Rubber Belt (350 mm/13.8 in)
- Dozer Straight Blade
- Dozer Blade Float
- Tie Downs on Track Frame
- Rubber Belt (350 mm/13.8 in)
- Dozer Straight Blade
- Dozer Blade Float
- Tie Downs on Track Frame
BOOM, STICK AND LINKAGES
- One Piece Boom (2500 mm/98.4 in)
- Standard Stick (1395 mm/54.9 in)
- Front Shovel Capable – Pin-On
- Thumb Ready
- Certified Lifting Eye
- Hydraulic Quick Coupler Lines
- One Piece Boom (2500 mm/98.4 in)
- Standard Stick (1395 mm/54.9 in)
- Front Shovel Capable – Pin-On
- Thumb Ready
- Certified Lifting Eye
ELECTRICAL
- 12 Volt Battery
- Software (machine and monitor)
- Maintenance Free Battery
- Lock Out/Tag Out Battery Disconnect
- 12 Volt Power Socket
- Product Link™ Elite
- Travel Alarm (optional in some regions)
- 12 Volt Battery
- Software (machine and monitor)
- Maintenance Free Battery
- Battery Disconnect
- 12 Volt Power Socket
- Travel Alarm (optional in some regions)
GUARDING
- ROPS – ISO 12117-2:2008
- Top Guard ISO 10262:1998 Level I
OTHER
- Eco Drain
- Counterweight (225 kg/496 lb)
Optional Equipment
OPERATOR ENVIRONMENT
- Cab with Air Conditioning
- Cab with Air Conditioning
- Cab with Heater
- Cab with Heater
- No Travel Pedals and Hand Levers (optional in some regions)
- No Travel Pedals and Hand Levers (optional in some regions)
- Machine Security – Push to Start with Key Fob/Pass Code
- Machine Security – Push to Start with Key Fob/Pass Code
- Seat Belt Reminder System
- LED Front Lights
- LED Front and Rear Lights
- LED Front and Rear Lights
- Mirrors, Left, Right and Rear
- LED Boom Light
- Camera
- Mirrors, Left, Right and Rear
- Radio – Bluetooth®, Auxiliary, Microphone, USB (charging only) (Cab only)
- Camera
- Next Generation Advanced Monitor– Touch Screen– Site Reference System– High Definition Camera Capable (IP68 and IP69K)– Numeric Security Code
- Radio – Bluetooth®, Auxiliary, Microphone, USB (charging only) (Cab only)
- Next Generation Advanced Monitor– Touch Screen– Site Reference System– High Definition Camera Capable (IP68 and IP69K)– Numeric Security Code
UNDERCARRIAGE
- Steel Track (350 mm/13.8 in)
- Angle Blade
- Steel Track (350 mm/13.8 in)
- Steel Track with Rubber Pads
- Angle Blade
BOOM, STICK AND LINKAGES
- Long Stick (1695 mm/66.7 in)
- Front Shovel Capable – Dual Lock Manual Coupler
- Front Shovel Capable – Hydraulic Coupler
- Attachments including Couplers, Thumbs, Buckets, Augers and Hammers
- 2nd Auxiliary Hydraulic Lines
- Long Stick (1695 mm/66.7 in)
- Bucket Divert Lines
- Front Shovel Capable – Dual Lock Manual Coupler
- Boom Lowering Check Valve (Europe Standard)
- Front Shovel Capable – Hydraulic Coupler
- Stick Lowering Check Valve (Europe Standard)
- Attachments including Couplers, Thumbs, Buckets, Augers and Hammers
- 2nd Auxiliary Hydraulic Lines
- Bucket Divert Lines
- Boom Lowering Check Valve
- Stick Lowering Check Valve
- Hydraulic Quick Coupler Lines
ELECTRICAL
- Cat Grade Advanced 2D
- Cat Grade 3D
- Product Link™ PL243 (regulations apply)
- Product Link PLE643 (regulations apply)
GUARDING
- Top Guard ISO 10262:1998 (Level II)
- Front Guard (Mesh) ISO 10262:1998 (Level I)
- Front Guard (Heavy Duty) ISO 10262:1998 Level (II)
- Polycarbonate Half Height Front Guard (Canopy only)
- Polycarbonate Front Guard (ISO 10262:1998 Level I and EN356 P5A)
- Heavy Duty Front Guard ISO 10262:1998 Level II
- Heavy Duty Top Guard 10262:1998 Level II (Cab only)
OTHER
- Bio Oil Capable
- Water Jacket Heater
- Counterweight (225 kg/496 lb)
- Bio Oil Capable
- Eco Drain
- Water Jacket Heater