Mini Excavators

304 Mini Excavator

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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
US
Metric

Overview

The Cat® 304 Mini Excavator delivers power and performance in a compact size to help you work in a wide range of applications.

Engine

Net Power
45.00 HP
33.60 kW
Engine Model
C1.7 Turbo
Gross Power - 2,400 rpm - SAE J1995:2014
48.40 HP
36.10 kW
Bore
3.30 in
84.00 mm
Emissions
Meets U.S. EPA Tier 4 Final and EU Stage V emission standards.
Stroke
3.90 in
100.00 mm
Displacement
101.00 in³
1.66 l
Net Power - 2,400 rpm - ISO 9249, 80/1269/EEC
45.00 HP
33.60 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
9867.00 lb
4475.00 kg
Minimum Operating Weight with Canopy*
8655.00 lb
3925.00 kg
Maximum Operating Weight with Canopy**
9647.00 lb
4375.00 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**
9867.00 lb
4475.00 kg
Minimum Operating Weight with Cab*
8875.00 lb
4025.00 kg

Weight Increase from Minimum Configuration

Steel Tracks
430.00 lb
195.00 kg
Counterweight
496.00 lb
225.00 kg
Angle Blade
243.00 lb
110.00 kg
Long Stick
66.00 lb
30.00 kg

Travel System

Ground Pressure - Minimum Weight
4.20 psi
28.70 kPa
Maximum Traction Force - Low Speed
7329.00 lbf
32.60 kN
Travel Speed - Low
2.20 mile/h
3.50 km/h
Ground Pressure - Maximum Weight
4.90 psi
33.80 kPa
Travel Speed - High
3.20 mile/h
5.20 km/h
Maximum Traction Force - High Speed
4271.00 lbf
19.00 kN
Gradeability - Maximum
30 degrees

Service Refill Capacities

Cooling System
2.90 gal (US)
11.00 l
Engine Oil
1.60 gal (US)
6.00 l
Hydraulic System
17.00 gal (US)
65.00 l
Fuel Tank
17.00 gal (US)
63.00 l
Hydraulic Tank
14.00 gal (US)
52.00 l

Hydraulic System

Operating Pressure - Travel
3553.00 psi
245.00 bar
Auxiliary Circuit - Secondary - Pressure
3553.00 psi
245.00 bar
Digging Force - Stick - Long
4316.00 lbf
19.20 kN
Auxiliary Circuit - Secondary - Flow
7.00 gal/min
28.00 l/min
Pump Flow at 2,400 rpm
25.00 gal/min
96.00 l/min
Operating Pressure - Swing
2611.00 psi
180.00 bar
Auxiliary Circuit - Primary - Flow
21.00 gal/min
65.00 l/min
Auxiliary Circuit - Primary - Pressure
3553.00 psi
245.00 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
4721.00 lbf
21.00 kN
Digging Force - Bucket
8588.00 lbf
38.20 kN
Operating Pressure - Equipment
3553.00 psi
245.00 bar

Swing System

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

Blade

Angle Blade Height
14.20 in
360.00 mm
Straight Blade Height
14.20 in
360.00 mm
Straight Blade Width
66.90 in
1700.00 mm
Angle Blade Width
66.90 in
1700.00 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)
97.00 dB(A)
97.00 dB(A)
Operator Sound Pressure (ISO 6396:2008)
76.00 dB(A)
76.00 dB(A)
Note
European Union Directive “2000/14/EC”

Dimensions - Standard Stick

Maximum Reach - Ground Level
204.70 in
5200.00 mm
Vertical Wall
94.30 in
2395.00 mm
Note
*Overall Shipping Length depends on blade position during shipment.
Tail Swing with Counterweight
51.20 in
1300.00 mm
Boom In Reach
88.80 in
2255.00 mm
Dig Depth
126.40 in
3210.00 mm
Maximum Dig Height
198.40 in
5040.00 mm
Maximum Blade Height
16.50 in
420.00 mm
Swing Bearing - Height
21.90 in
557.00 mm
Boom Swing - Left
20.90 in
530.00 mm
Stick Length
54.90 in
1395.00 mm
O/A Undercarriage Length
87.00 in
2210.00 mm
Track Belt/Shoe Width
13.80 in
350.00 mm
Boom Height - Shipping Position
63.80 in
1620.00 mm
Boom Swing - Right
28.70 in
730.00 mm
Maximum Dump Clearance
143.50 in
3645.00 mm
Ground Clearance
12.00 in
305.00 mm
Maximum Reach
209.80 in
5330.00 mm
O/A Shipping Height
100.00 in
2540.00 mm
Tail Swing without Counterweight
47.40 in
1205.00 mm
Maximum Blade Depth
18.70 in
475.00 mm
Overall Shipping Length*
194.90 in
4950.00 mm

Dimensions - Long Stick

Dig Depth
138.20 in
3510.00 mm
Maximum Blade Depth
18.70 in
475.00 mm
O/A Shipping Height
100.00 in
2540.00 mm
Maximum Dump Clearance
147.20 in
3740.00 mm
Stick Length
66.70 in
1695.00 mm
Maximum Dig Height
201.80 in
5125.00 mm
Maximum Reach - Ground Level
214.40 in
5445.00 mm
Track Width
66.90 in
1700.00 mm
Tail Swing with Counterweight
51.20 in
1300.00 mm
Swing Bearing - Height
21.90 in
557.00 mm
Boom Height - Shipping Position
75.20 in
1910.00 mm
Boom Swing - Left
20.90 in
530.00 mm
Maximum Reach
219.30 in
5570.00 mm
Boom In Reach
92.10 in
2340.00 mm
Boom Swing - Right
28.70 in
730.00 mm
Track Belt/Shoe Width
13.80 in
350.00 mm
Vertical Wall
99.80 in
2535.00 mm
Maximum Blade Height
16.50 in
420.00 mm
Note
*Overall Shipping Length depends on blade position during shipment.
Overall Shipping Length*
194.90 in
4950.00 mm
Ground Clearance
12.00 in
305.00 mm
O/A Undercarriage Length
87.00 in
2210.00 mm
Tail Swing without Counterweight
47.40 in
1205.00 mm

Sustainability

Recyclability
96%
Features

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)
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