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.

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).

*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

ENGINE
  • Cat® C1.7 Turbo Engine (U.S. EPA Tier 4 Final/EU Stage V)
  • Automatic Engine Idle
  • Automatic Engine Shutdown
  • Automatic Two Speed Travel
  • Fuel Water Separator
  • Power on Demand (not available in all regions)
  • Variable Displacement Piston Pump
  • Load Sensing/Flow Sharing Hydraulics
HYDRAULICS
  • Smart Tech Electronic Pump
  • Accumulator
  • Automatic Swing Brake
  • Auxiliary Hydraulic Lines
  • One and Two Way Auxiliary Flow
  • Continuous Auxiliary Flow
  • Auxiliary Line Quick Disconnects
OPERATOR ENVIRONMENT
  • Canopy or Cab (Canopy not available in some regions)
  • Top Guard ISO 10262:1998 Level I
  • ROPS – ISO 12117-2:2008
  • TOPS – ISO 12117:1997
  • Stick Steer Mode
  • Travel Cruise Control
  • Control Pattern Changer (optional in some regions)
  • Adjustable Wrist Rests
  • Washable Floor Mat
  • Travel Pedals and Hand Levers
  • Machine Security – Standard Key with Pass Code
  • Fabric Suspension Seat (Cab only)
  • Vinyl Suspension Seat (Canopy only)
  • Hydraulic Lockout – All Controls
  • Retractable High Visibility Seat Belt (75 mm/3 in)
  • Coat Hook
  • Cup Holder
  • Storage Pocket
  • Skylight
  • 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
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
ELECTRICAL
  • 12 Volt Battery
  • Software (machine and monitor)
  • Maintenance Free Battery
  • Battery Disconnect
  • 12 Volt Power Socket
  • Travel Alarm (optional in some regions)
OTHER
  • Counterweight (225 kg/496 lb)

Additional information

Engine - Net Power

33.6 kW ( 45 HP )

Offering Type

Engine Model

C1.7 Turbo

Engine - Gross Power - 2,400 rpm - SAE J1995:2014

36.1 kW ( 48.4 HP )

Engine - Bore

84 mm ( 3.3 in )

Engine - Emissions

Meets U.S. EPA Tier 4 Final and EU Stage V emission standards.

Engine - Stroke

100 mm ( 3.9 in )

Engine - Displacement

1.662 l ( 101 in³ )

Engine - Net Power - 2,400 rpm - ISO 9249, 80/1269/EEC

33.6 kW ( 45 HP )

Weights - Operating Weight

4475 kg ( 9867 lb )

Weights - Minimum Operating Weight with Canopy*

3925 kg ( 8655 lb )

Weights - Maximum Operating Weight with Canopy**

4375 kg ( 9647 lb )

Weights - Maximum Operating Weight with Cab**

4475 kg ( 9867 lb )

Weights - Minimum Operating Weight with Cab*

4025 kg ( 8875 lb )

Weight Increase from Minimum Configuration - Steel Tracks

195 kg ( 430 lb )

Weight Increase from Minimum Configuration - Counterweight

225 kg ( 496 lb )

Weight Increase from Minimum Configuration - Angle Blade

110 kg ( 243 lb )

Weight Increase from Minimum Configuration - Long Stick

30 kg ( 66 lb )

Travel System - Ground Pressure - Minimum Weight

28.7 kPa ( 4.2 psi )

Travel System - Maximum Traction Force - Low Speed

32.6 kN ( 7329 lbf )

Travel System - Travel Speed - Low

3.5 km/h ( 2.2 mile/h )

Travel System - Ground Pressure - Maximum Weight

33.8 kPa ( 4.9 psi )

Travel System - Travel Speed - High

5.2 km/h ( 3.2 mile/h )

Travel System - Maximum Traction Force - High Speed

19 kN ( 4271 lbf )

Travel System - Gradeability - Maximum

30 degrees

Service Refill Capacities - Cooling System

11 l ( 2.9 gal (US) )

Service Refill Capacities - Engine Oil

6 l ( 1.6 gal (US) )

Service Refill Capacities - Hydraulic System

65 l ( 17 gal (US) )

Service Refill Capacities - Fuel Tank

63 l ( 17 gal (US) )

Service Refill Capacities - Hydraulic Tank

52 l ( 14 gal (US) )

Hydraulic System - Operating Pressure - Travel

245 bar ( 3553 psi )

Hydraulic System - Auxiliary Circuit - Secondary - Pressure

245 bar ( 3553 psi )

Hydraulic System - Digging Force - Stick - Long

19.2 kN ( 4316 lbf )

Hydraulic System - Auxiliary Circuit - Secondary - Flow

28 l/min ( 7 gal/min )

Hydraulic System - Pump Flow at 2,400 rpm

96 l/min ( 25 gal/min )

Hydraulic System - Operating Pressure - Swing

180 bar ( 2611 psi )

Hydraulic System - Auxiliary Circuit - Primary - Flow

65 l/min ( 21 gal/min )

Hydraulic System - Auxiliary Circuit - Primary - Pressure

245 bar ( 3553 psi )

Hydraulic System - Type

Load Sensing Hydraulics with Variable Displacement Piston Pump

Hydraulic System - Digging Force - Stick - Standard

21 kN ( 4721 lbf )

Hydraulic System - Digging Force - Bucket

38.2 kN ( 8588 lbf )

Hydraulic System - Operating Pressure - Equipment

245 bar ( 3553 psi )

Swing System - Boom Swing - Right
Swing System - Machine Swing Speed

9 r/min ( 9 r/min )

Swing System - Boom Swing - Left

78 Degrees

Angle Blade Height

360 mm ( 14.2 in )

Straight Blade Height

360 mm ( 14.2 in )

Straight Blade Width

1700 mm ( 66.9 in )

Angle Blade Width

1700 mm ( 66.9 in )

Certification - Cab and Canopy - Roll Over Protective Structure (ROPS)

ISO 12117-2:2008

Certification - Cab and Canopy - Top Guard

ISO 10262:1998 (Level I)

Certification - Cab and Canopy - Tip Over Protective Structure (TOPS)

ISO 12117:1997

Average Exterior Sound Pressure (ISO 6395:2008)

97 dB(A) ( 97 dB(A) )

Operator Sound Pressure (ISO 6396:2008)

76 dB(A) ( 76 dB(A) )

Dimensions - Standard Stick - Maximum Reach - Ground Level

5200 mm ( 204.7 in )

Dimensions - Standard Stick - Vertical Wall

2395 mm ( 94.3 in )

Dimensions - Standard Stick - Tail Swing with Counterweight

1300 mm ( 51.2 in )

Dimensions - Standard Stick - Boom In Reach

2255 mm ( 88.8 in )

Dimensions - Standard Stick - Dig Depth

3210 mm ( 126.4 in )

Dimensions - Standard Stick - Maximum Dig Height

5040 mm ( 198.4 in )

Dimensions - Standard Stick - Maximum Blade Height

420 mm ( 16.5 in )

Dimensions - Standard Stick - Swing Bearing - Height

557 mm ( 21.9 in )

Dimensions - Standard Stick - Boom Swing - Left

530 mm ( 20.9 in )

Dimensions - Standard Stick - Stick Length

1395 mm ( 54.9 in )

Dimensions - Standard Stick - O/A Undercarriage Length

2210 mm ( 87 in )

Dimensions - Standard Stick - Track Belt/Shoe Width

350 mm ( 13.8 in )

Dimensions - Standard Stick - Boom Height - Shipping Position

1620 mm ( 63.8 in )

Dimensions - Standard Stick - Boom Swing - Right

730 mm ( 28.7 in )

Dimensions - Standard Stick - Maximum Dump Clearance

3645 mm ( 143.5 in )

Dimensions - Standard Stick - Ground Clearance

305 mm ( 12 in )

Dimensions - Standard Stick - Maximum Reach

5330 mm ( 209.8 in )

Dimensions - Standard Stick - O/A Shipping Height

2540 mm ( 100 in )

Dimensions - Standard Stick - Tail Swing without Counterweight

1205 mm ( 47.4 in )

Dimensions - Standard Stick - Maximum Blade Depth

475 mm ( 18.7 in )

Dimensions - Standard Stick - Overall Shipping Length*

4950 mm ( 194.9 in )

Dimensions - Long Stick - Dig Depth

3510 mm ( 138.2 in )

Dimensions - Long Stick - Maximum Blade Depth

475 mm ( 18.7 in )

Dimensions - Long Stick - O/A Shipping Height

2540 mm ( 100 in )

Dimensions - Long Stick - Maximum Dump Clearance

3740 mm ( 147.2 in )

Dimensions - Long Stick - Maximum Dig Height

5125 mm ( 201.8 in )

Dimensions - Long Stick - Stick Length

1695 mm ( 66.7 in )

Dimensions - Long Stick - Maximum Reach - Ground Level

5445 mm ( 214.4 in )

Dimensions - Long Stick - Track Width

1700 mm ( 66.9 in )

Dimensions - Long Stick - Tail Swing with Counterweight

1300 mm ( 51.2 in )

Dimensions - Long Stick - Swing Bearing - Height

557 mm ( 21.9 in )

Dimensions - Long Stick - Boom Height - Shipping Position

1910 mm ( 75.2 in )

Dimensions - Long Stick - Boom Swing - Left

530 mm ( 20.9 in )

Dimensions - Long Stick - Maximum Reach

5570 mm ( 219.3 in )

Dimensions - Long Stick - Boom In Reach

2340 mm ( 92.1 in )

Dimensions - Long Stick - Boom Swing - Right

730 mm ( 28.7 in )

Dimensions - Long Stick - Track Belt/Shoe Width

350 mm ( 13.8 in )

Dimensions - Long Stick - Vertical Wall

2535 mm ( 99.8 in )

Dimensions - Long Stick - Maximum Blade Height

420 mm ( 16.5 in )

Dimensions - Long Stick - Overall Shipping Length*

4950 mm ( 194.9 in )

Dimensions - Long Stick - Ground Clearance

305 mm ( 12 in )

Dimensions - Long Stick - O/A Undercarriage Length

2210 mm ( 87 in )

Dimensions - Long Stick - Tail Swing without Counterweight

1205 mm ( 47.4 in )

Sustainability - Recyclability

96%

Weights - Note (1)

*Minimum Weight is based on rubber tracks, operator, full fuel tank, standard stick, straight blade, no bucket and no extra counterweight.

Weights - Note (2)

**Maximum Weight is based on steel tracks, operator, full fuel tank, long stick, straight blade, extra counterweight and no bucket.

Hydraulic System - Note

Flow and pressure are not combinable. Under load, as flow rises pressure goes down.

Sound - Note

European Union Directive “2000/14/EC”

Dimensions - Standard Stick - Note

*Overall Shipping Length depends on blade position during shipment.

Dimensions - Long Stick - Note

*Overall Shipping Length depends on blade position during shipment.

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