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304 Mini Excavator

304 Mini Excavator

Mini Excavators Inspired by Our Customers

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More Comfort – More Performance – More Versatility

  • 4 Industry First Features

    Cat Exclusives in a Mini Excavator

  • Up to 10% Lower Total Ownership Costs

    with extended service intervals, lower repair costs and easy service access

  • Up to 20% More Performance

    in lifting, digging and multi-function capability

Engine

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

Weights

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

Weight Increase from Minimum Configuration

Angle Blade 243 lb
Counterweight 496 lb
Long Stick 66 lb
Steel Tracks 430 lb

Travel System

Gradeability - Maximum 30 degrees
Ground Pressure - Maximum Weight 4.9 psi
Ground Pressure - Minimum Weight 4.2 psi
Maximum Traction Force - High Speed 4271 lbf
Maximum Traction Force - Low Speed 7329 lbf
Travel Speed - High 3.2 mile/h
Travel Speed - Low 2.2 mile/h

Service Refill Capacities

Cooling System 2.9 gal (US)
Engine Oil 1.6 gal (US)
Fuel Tank 17 gal (US)
Hydraulic System 17 gal (US)
Hydraulic Tank 14 gal (US)

Hydraulic System

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

Swing System

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

Blade

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

Certification - Cab and Canopy

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

Sound

Average Exterior Sound Pressure (ISO 6395:2008) 97 dB(A)
Note European Union Directive “2000/14/EC”
Operator Sound Pressure (ISO 6396:2008) 76 dB(A)

Dimensions - Standard Stick

Boom Height - Shipping Position 63.8 in
Boom In Reach 88.8 in
Boom Swing - Left 20.9 in
Boom Swing - Right 28.7 in
Dig Depth 126.4 in
Ground Clearance 12 in
Maximum Blade Depth 18.7 in
Maximum Blade Height 16.5 in
Maximum Dig Height 198.4 in
Maximum Dump Clearance 143.5 in
Maximum Reach 209.8 in
Maximum Reach - Ground Level 204.7 in
Note *Overall Shipping Length depends on blade position during shipment.
O/A Shipping Height 100 in
O/A Undercarriage Length 87 in
Overall Shipping Length* 194.9 in
Stick Length 54.9 in
Swing Bearing - Height 21.9 in
Tail Swing with Counterweight 51.2 in
Tail Swing without Counterweight 47.4 in
Track Belt/Shoe Width 13.8 in
Vertical Wall 94.3 in

Dimensions - Long Stick

Boom Height - Shipping Position 75.2 in
Boom In Reach 92.1 in
Boom Swing - Left 20.9 in
Boom Swing - Right 28.7 in
Dig Depth 138.2 in
Ground Clearance 12 in
Maximum Blade Depth 18.7 in
Maximum Blade Height 16.5 in
Maximum Dig Height 201.8 in
Maximum Dump Clearance 147.2 in
Maximum Reach 219.3 in
Maximum Reach - Ground Level 214.4 in
Note *Overall Shipping Length depends on blade position during shipment.
O/A Shipping Height 100 in
O/A Undercarriage Length 87 in
Overall Shipping Length* 194.9 in
Stick Length 66.7 in
Swing Bearing - Height 21.9 in
Tail Swing with Counterweight 51.2 in
Tail Swing without Counterweight 47.4 in
Track Belt/Shoe Width 13.8 in
Track Width 66.9 in
Vertical Wall 99.8 in

Sustainability

Recyclability 96%

Download resources

304 Small Product Brochure (AUZ, EU, NACD)
Cat Mini Hydraulic Excavators Product Line Brochure (North America)
Cat Mini Hydraulic Excavators Product Line Brochure (Europe)
Options And Accessories Kit Guide for Mini Hydraulic Excavators
Cat Attachments for Mini Excavators Brochure
Attachment Compatibility Guide for Mini Excavators

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