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.

304 Mini Hydraulic Excavator
304 Mini Hydraulic Excavator
304 Mini Hydraulic Excavator
304 Mini Hydraulic Excavator
Front View
Top View
Left View
Rear View
Right View
Bottom View

Features

  • ALL DAY COMFORT

    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

    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

    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

    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

    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

    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

    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

    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)

Specifications

Units for specifications

Engine

Net Power 45 hp 33.6 kW
Engine Model C1.7 Turbo
Gross Power - 2,400 rpm - SAE J1995:2014 48.4 hp 36.1 kW
Bore 3.3 in 84 mm
Emissions Meets U.S. EPA Tier 4 Final and EU Stage V emission standards.
Stroke 3.9 in 100 mm
Displacement 101 in³ 1.662 l
Net Power - 2,400 rpm - ISO 9249, 80/1269/EEC 45 hp 33.6 kW
Note 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.

Weights

Operating Weight 9867 lb 4475 kg
Minimum Operating Weight with Canopy* 8655 lb 3925 kg
Maximum Operating Weight with Canopy** 9647 lb 4375 kg
Note (2) **Maximum Weight is based on steel tracks, operator, full fuel tank, long stick, straight blade, extra counterweight and no bucket.
Note (1) *Minimum Weight is based on rubber tracks, operator, full fuel tank, standard stick, straight blade, no bucket and no extra counterweight.
Maximum Operating Weight with Cab** 9867 lb 4475 kg
Minimum Operating Weight with Cab* 8875 lb 4025 kg

Weight Increase from Minimum Configuration

Steel Tracks 430 lb 195 kg
Counterweight 496 lb 225 kg
Angle Blade 243 lb 110 kg
Long Stick 66 lb 30 kg

Travel System

Ground Pressure - Minimum Weight 4.2 psi 28.7 kPa
Maximum Traction Force - Low Speed 7329 lbf 32.6 kN
Travel Speed - Low 2.2 mile/h 3.5 km/h
Ground Pressure - Maximum Weight 4.9 psi 33.8 kPa
Travel Speed - High 3.2 mile/h 5.2 km/h
Maximum Traction Force - High Speed 4271 lbf 19 kN
Gradeability - Maximum 30 degrees

Service Refill Capacities

Cooling System 2.9 gal (US) 11 l
Engine Oil 1.6 gal (US) 6 l
Hydraulic System 17 gal (US) 65 l
Fuel Tank 17 gal (US) 63 l
Hydraulic Tank 14 gal (US) 52 l

Hydraulic System

Operating Pressure - Travel 3553 psi 245 bar
Auxiliary Circuit - Secondary - Pressure 3553 psi 245 bar
Digging Force - Stick - Long 4316 lbf 19.2 kN
Auxiliary Circuit - Secondary - Flow 7 gal/min 28 l/min
Pump Flow at 2,400 rpm 25 gal/min 96 l/min
Operating Pressure - Swing 2611 psi 180 bar
Auxiliary Circuit - Primary - Flow 21 gal/min 65 l/min
Auxiliary Circuit - Primary - Pressure 3553 psi 245 bar
Note Flow and pressure are not combinable. Under load, as flow rises pressure goes down.
Type Load Sensing Hydraulics with Variable Displacement Piston Pump
Digging Force - Stick - Standard 4721 lbf 21 kN
Digging Force - Bucket 8588 lbf 38.2 kN
Operating Pressure - Equipment 3553 psi 245 bar

Swing System

Boom Swing - Right 50 Degrees
Machine Swing Speed 9 r/min 9 r/min
Boom Swing - Left 78 Degrees

Blade

Angle Blade Height 14.2 in 360 mm
Straight Blade Height 14.2 in 360 mm
Straight Blade Width 66.9 in 1700 mm
Angle Blade Width 66.9 in 1700 mm
Angle Blade - Right 25 Degrees
Angle Blade - Left 25 Degrees

Certification - Cab and Canopy

Roll Over Protective Structure (ROPS) ISO 12117-2:2008
Top Guard ISO 10262:1998 (Level I)
Tip Over Protective Structure (TOPS) ISO 12117:1997

Sound

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)
Note European Union Directive “2000/14/EC”

Dimensions - Standard Stick

Maximum Reach - Ground Level 204.7 in 5200 mm
Vertical Wall 94.3 in 2395 mm
Note *Overall Shipping Length depends on blade position during shipment.
Tail Swing with Counterweight 51.2 in 1300 mm
Boom In Reach 88.8 in 2255 mm
Dig Depth 126.4 in 3210 mm
Maximum Dig Height 198.4 in 5040 mm
Maximum Blade Height 16.5 in 420 mm
Swing Bearing - Height 21.9 in 557 mm
Boom Swing - Left 20.9 in 530 mm
Stick Length 54.9 in 1395 mm
O/A Undercarriage Length 87 in 2210 mm
Track Belt/Shoe Width 13.8 in 350 mm
Boom Height - Shipping Position 63.8 in 1620 mm
Boom Swing - Right 28.7 in 730 mm
Maximum Dump Clearance 143.5 in 3645 mm
Ground Clearance 12 in 305 mm
Maximum Reach 209.8 in 5330 mm
O/A Shipping Height 100 in 2540 mm
Tail Swing without Counterweight 47.4 in 1205 mm
Maximum Blade Depth 18.7 in 475 mm
Overall Shipping Length* 194.9 in 4950 mm

Dimensions - Long Stick

Dig Depth 138.2 in 3510 mm
Maximum Blade Depth 18.7 in 475 mm
O/A Shipping Height 100 in 2540 mm
Maximum Dump Clearance 147.2 in 3740 mm
Stick Length 66.7 in 1695 mm
Maximum Dig Height 201.8 in 5125 mm
Maximum Reach - Ground Level 214.4 in 5445 mm
Track Width 66.9 in 1700 mm
Tail Swing with Counterweight 51.2 in 1300 mm
Swing Bearing - Height 21.9 in 557 mm
Boom Height - Shipping Position 75.2 in 1910 mm
Boom Swing - Left 20.9 in 530 mm
Maximum Reach 219.3 in 5570 mm
Boom In Reach 92.1 in 2340 mm
Boom Swing - Right 28.7 in 730 mm
Track Belt/Shoe Width 13.8 in 350 mm
Vertical Wall 99.8 in 2535 mm
Maximum Blade Height 16.5 in 420 mm
Note *Overall Shipping Length depends on blade position during shipment.
Overall Shipping Length* 194.9 in 4950 mm
Ground Clearance 12 in 305 mm
O/A Undercarriage Length 87 in 2210 mm
Tail Swing without Counterweight 47.4 in 1205 mm

Sustainability

Recyclability 96%

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)

Optional Equipment

OPERATOR ENVIRONMENT

  • Cab with Air Conditioning
  • Cab with Heater
  • No Travel Pedals and Hand Levers (optional in some regions)
  • Machine Security – Push to Start with Key Fob/Pass Code
  • LED Front Lights
  • LED Front and Rear Lights
  • LED Boom Light
  • Mirrors, Left, Right and Rear
  • Camera
  • 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)
  • 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
  • Bucket Divert Lines
  • Boom Lowering Check Valve
  • Stick Lowering Check Valve
  • Hydraulic Quick Coupler Lines

ELECTRICAL

  • Product Link™ PL243 (regulations apply)
  • Product Link PLE643 (regulations apply)

GUARDING

  • 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
  • Eco Drain
  • Water Jacket Heater

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)
304 Mini Hydraulic Excavator

Documents

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