US
Metric

Overview

The Cat® 304E2 CR Mini Hydraulic Excavator delivers efficient performance, durability and versatility in a compact design to help you work in a variety of applications.

Engine

Engine Model
Cat® C2.4
Net Power
40.20 hp
30.00 kW
Rated Net Power @ 2,200 rpm – ISO 9249/EEC 80/1269
40.20 hp
30.00 kW

Weights*

Operating Weight
8996.00 lb
4080.00 kg
Weight – Canopy, Standard Stick
8655.00 lb
3925.00 kg

Engine

Bore
3.40 in
87.00 mm
Stroke
4.00 in
102.40 mm
Displacement
146.00 in3
2.40 L

Travel System

Travel Speed – High
3.20 mph
5.20 km/h
Travel Speed – Low
2.10 mph
3.30 km/h
Maximum Traction Force - High Speed
3799.00 lb
16.90 kN
Maximum Traction Force - Low Speed
6969.00 lb
31.00 kN

Hydraulic System

Pump Flow at 2,200 rpm
26.40 gal/min
100.00 L/min
Operating Pressure - Equipment
3553.00 psi
245.00 bar
Operating Pressure - Travel
3553.00 psi
245.00 bar
Operating Pressure - Swing
3132.00 psi
216.00 bar
Auxiliary Circuit – Primary (186 bar/2,734 psi)
18.50 gal/min
70.00 L/min
Auxiliary Circuit – Secondary (174 bar/2,524 psi)
6.60 gal/min
25.00 L/min
Digging Force - Stick - Standard
4856.00 lb
21.60 kN
Digging Force - Stick - Long
4384.00 lb
19.50 kN

Swing System

Machine Swing Speed
10.00 rpm
10.00 rpm
Boom Swing – Left (without stop)*
70°
Boom Swing – Left (with stop)*
55°
Boom Swing – Right
50°

Blade

Width
76.80 in
1950.00 mm
Height
12.80 in
325.00 mm
Dig Depth
18.50 in
470.00 mm
Lift Height
15.70 in
400.00 mm

Service Refill Capacities

Cooling System
1.50 gal
5.50 L
Engine Oil
2.50 gal
9.50 L
Hydraulic Tank
11.20 gal
42.30 L
Fuel Tank
12.20 gal
46.00 L
Hydraulic System
17.20 gal
65.00 L

Engine

Gross Power – ISO 14396
41.80 hp
31.20 kW
Emissions
*Meets U.S. EPA Tier 4 Final/EU Stage IIIA emission standards.

Weights*

Weight – Canopy, Long Stick
8721.00 lb
3955.00 kg
Weight – Cab, Standard Stick
8930.00 lb
4050.00 kg

Operating Specifications

Stick Length – Standard
52.00 in
1315.00 mm

Travel System

Ground Pressure – Canopy
4.10 psi
28.10 kPa

Hydraulic System

Digging Force – Bucket
8498.00 lb
37.80 kN
Type
Load Sensing Hydraulics with Variable Displacement Piston Pump

Weights*

Weight – Cab, Long Stick
8996.00 lb
4080.00 kg
Note
*Weight includes counterweight, rubber tracks, bucket, operator, full fuel and auxiliary lines.

Swing System

Note
*Automatic swing brake, spring applied, hydraulic release.

Travel System

Ground Pressure – Cab
4.30 psi
29.50 kPa
Gradeability (maximum)
30°

Cab

Dynamic Operator Sound Pressure Level (ISO 6396:2008)
81.00 dB(A)
81.00 dB(A)
Exterior Sound Power Level (ISO 6395:2008)*
96.00 dB(A)
96.00 dB(A)
Note
*European Union Directive “2000/14/EC”

Certification – Cab and Canopy

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

Operating Specifications

Stick Length – Long
64.00 in
1615.00 mm
Machine Overhang
0.00 in
0.00 mm

Undercarriage

Number of Carrier Rollers
1
Number of Track Rollers
4
Track Roller Type
Center Flange

Lift Capacities at Ground Level - Lift Point Radius: 3000 mm (118 in)

Blade Down - Front
3462.00 lb
1570.00 kg
Blade Up - Front
1808.00 lb
820.00 kg
Blade Down - Side
2007.00 lb
910.00 kg
Blade Up - Side
1808.00 lb
820.00 kg

Lift Capacities at Ground Level - Lift Point Radius: 4500 mm (177 in)

Blade Down - Front
1896.00 lb
860.00 kg
Blade Up - Front
948.00 lb
430.00 kg
Blade Down - Side
1058.00 lb
480.00 kg
Blade Up - Side
948.00 lb
430.00 kg

Dimensions – Standard Stick

Dig Depth
123.00 in
3130.00 mm
Vertical Wall
95.00 in
2420.00 mm
Maximum Reach at Ground Level
206.00 in
5220.00 mm
Maximum Reach
211.00 in
5350.00 mm
Maximum Dig Height
196.00 in
4980.00 mm
Maximum Dump Clearance
141.00 in
3590.00 mm
Boom In Reach
83.00 in
2110.00 mm
Tail Swing
38.00 in
975.00 mm
Maximum Blade Height
16.00 in
400.00 mm
Maximum Blade Depth
19.00 in
470.00 mm
Boom Height in Shipping Position
58.00 in
1480.00 mm
O/A Shipping Height
98.00 in
2500.00 mm
Swing Bearing Height
22.00 in
565.00 mm
O/A Undercarriage Length
87.00 in
2220.00 mm
O/A Shipping Length
190.00 in
4820.00 mm
Boom Swing Right
29.00 in
735.00 mm
Boom Swing Left
26.00 in
670.00 mm
Track Belt/Shoe Width
14.00 in
350.00 mm
O/A Track Width
77.00 in
1950.00 mm

Dimensions – Long Stick

Dig Depth
135.00 in
3430.00 mm
Vertical Wall
101.00 in
2560.00 mm
Maximum Reach at Ground Level
215.00 in
5470.00 mm
Maximum Reach
220.00 in
5590.00 mm
Maximum Dig Height
200.00 in
5070.00 mm
Maximum Dump Clearance
145.00 in
3690.00 mm
Boom In Reach
87.00 in
2220.00 mm
Tail Swing
38.00 in
975.00 mm
Maximum Blade Height
16.00 in
400.00 mm
Maximum Blade Depth
19.00 in
470.00 mm
Boom Height in Shipping Position
70.00 in
1770.00 mm
O/A Shipping Height
98.00 in
2500.00 mm
Swing Bearing Height
22.00 in
565.00 mm
O/A Undercarriage Length
87.00 in
2220.00 mm
O/A Shipping Length
194.00 in
4930.00 mm
Boom Swing Right
29.00 in
735.00 mm
Boom Swing Left
26.00 in
670.00 mm
Track Belt/Shoe Width
14.00 in
350.00 mm
O/A Track Width
77.00 in
1950.00 mm

Engine

Engine Model
Cat® C2.4
Net Power
40.20 HP
30.00 kW
Rated Net Power - 2,200 rpm - ISO 9249/EEC 80/1269
40.20 HP
30.00 kW

Weights*

Weight - Canopy, Standard Stick
8655.00 lb
3925.00 kg

Engine

Bore
3.40 in
87.00 mm
Displacement
146.00 in³
2.40 l
Stroke
4.00 in
102.40 mm

Travel System

Travel Speed - High
3.20 mile/h
5.20 km/h
Travel Speed - Low
2.10 mile/h
3.30 km/h

Hydraulic System

Auxiliary Circuit - Primary (186 bar/2,734 psi)
18.50 gal/min
70.00 l/min
Auxiliary Circuit - Secondary (174 bar/2,524 psi)
6.60 gal/min
25.00 l/min
Pump Flow at 2,200 rpm
26.40 gal/min
100.00 l/min

Swing System

Machine Swing Speed
10.00 r/min
10.00 r/min
Boom Swing - Left - With Stop*
55°
Boom Swing - Left - Without Stop*
70°
Boom Swing - Right
50°

Blade

Width
76.80 in
1950.00 mm

Service Refill Capacities

Cooling System
1.50 gal (US)
5.50 l
Engine Oil
2.50 gal (US)
9.50 l
Hydraulic Tank
11.20 gal (US)
42.30 l
Fuel Tank
12.20 gal (US)
46.00 l
Hydraulic System
17.20 gal (US)
65.00 l

Cab

Dynamic Operator Sound Pressure Level (ISO 6396:2008)
81.00 dB(A)
81.00 dB(A)
Exterior Sound Power Level - ISO 6395:2008*
96.00 dB(A)
96.00 dB(A)
Note
*European Union Directive “2000/14/EC”

Certification - Cab and Canopy

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

Dimensions - Long Stick

Boom Height - Shipping Position
70.00 in
1770.00 mm
Boom In Reach
87.00 in
2220.00 mm
Boom Swing - Left
26.00 in
670.00 mm
Boom Swing - Right
29.00 in
735.00 mm
Dig Depth
135.00 in
3430.00 mm
Maximum Blade Depth
19.00 in
470.00 mm
Maximum Blade Height
16.00 in
400.00 mm
Maximum Dig Height
200.00 in
5070.00 mm
Maximum Dump Clearance
145.00 in
3690.00 mm
Maximum Reach
220.00 in
5590.00 mm
Maximum Reach - Ground Level
215.00 in
5470.00 mm
O/A Shipping Height
98.00 in
2500.00 mm
O/A Shipping Length
194.00 in
4930.00 mm
O/A Track Width
77.00 in
1950.00 mm
O/A Undercarriage Length
87.00 in
2220.00 mm
Swing Bearing - Height
22.00 in
565.00 mm
Tail Swing
38.00 in
975.00 mm
Track Belt/Shoe Width
14.00 in
350.00 mm
Vertical Wall
101.00 in
2560.00 mm

Dimensions - Standard Stick

Boom Height - Shipping Position
58.00 in
1480.00 mm
Boom In Reach
83.00 in
2110.00 mm
Boom Swing - Left
26.00 in
670.00 mm
Boom Swing - Right
29.00 in
735.00 mm
Dig Depth
123.00 in
3130.00 mm
Maximum Blade Depth
19.00 in
470.00 mm
Maximum Blade Height
16.00 in
400.00 mm
Maximum Dig Height
196.00 in
4980.00 mm
Maximum Dump Clearance
141.00 in
3590.00 mm
Maximum Reach
211.00 in
5350.00 mm
Maximum Reach - Ground Level
206.00 in
5220.00 mm
O/A Shipping Height
98.00 in
2500.00 mm
O/A Shipping Length
190.00 in
4820.00 mm
O/A Track Width
77.00 in
1950.00 mm
O/A Undercarriage Length
87.00 in
2220.00 mm
Swing Bearing - Height
22.00 in
565.00 mm
Tail Swing
38.00 in
975.00 mm
Track Belt/Shoe Width
14.00 in
350.00 mm
Vertical Wall
95.00 in
2420.00 mm

Engine

Emissions
*Meets U.S. EPA Tier 4 Final/EU Stage IIIA emission standards.
Gross Power - ISO 14396
41.80 HP
31.20 kW

Hydraulic System

Digging Force - Bucket
8498.00 lb
37.80 kN
Type
Load Sensing Hydraulics with Variable Displacement Piston Pump

Operating Specifications

Machine Overhang
0.00 in
0.00 mm
Stick Length - Long
64.00 in
1615.00 mm
Stick Length - Standard
52.00 in
1315.00 mm

Swing System

Note
*Automatic swing brake, spring applied, hydraulic release.

Travel System

Gradeability - Maximum
30°
Ground Pressure - Cab
4.30 psi
29.50 kPa
Ground Pressure - Canopy
4.10 psi
28.10 kPa

Undercarriage

Number of Carrier Rollers
1
Number of Track Rollers
4
Track Roller Type
Center Flange

Weights*

Note
*Weight includes counterweight, rubber tracks, bucket, operator, full fuel and auxiliary lines.
Weight - Cab, Long Stick
8996.00 lb
4080.00 kg
Weight - Cab, Standard Stick
8930.00 lb
4050.00 kg
Weight - Canopy, Long Stick
8721.00 lb
3955.00 kg

Air Conditioning System

Air Conditioning
The air conditioning system on this machine contains the fluorinated greenhouse gas refrigerant R134a (Global Warming Potential = 1430). The system contains 1.0 kg of refrigerant which has a CO2 equivalent of 1.4 metric tonnes.
Air Conditioning
The air conditioning system on this machine contains the fluorinated greenhouse gas refrigerant R134a (Global Warming Potential = 1430). The system contains 1.0 kg of refrigerant which has a CO2 equivalent of 1.4 metric tonnes.
Air Conditioning
The air conditioning system on this machine contains the fluorinated greenhouse gas refrigerant R134a (Global Warming Potential = 1430). The system contains 1.0 kg of refrigerant which has a CO2 equivalent of 1.4 metric tonnes.
Air Conditioning
The air conditioning system on this machine contains the fluorinated greenhouse gas refrigerant R134a (Global Warming Potential = 1430). The system contains 1.0 kg of refrigerant which has a CO2 equivalent of 1.4 metric tonnes.
Features

QUALITY

The durable hoods and frame and the compact radius design of the 304E2 let you work comfortably and confidently in confined areas. The operator environment includes a high quality suspension seat, easy to adjust armrests and 100% pilot controls which offer consistent and long-lasting controllability.

EFFICIENCY

High Definition Hydraulic System provides a load sensing and flow sharing capability leading to operational precision, efficient performance and greater controllability. Power on Demand provides optimal efficiency and performance the moment you need it. This automatic system ensures fuel efficiency through appropriate engine rating to meet all operational needs as required.

VERSATILITY

Broad range of Cat Work Tools make the Cat Mini Excavator a versatile machine able to meet the requirements of any job site. Over 200 degrees of bucket rotation provides greater material retention during truck loading and easier flat wall digging without having to reposition the machine.

PERFORMANCE

Front shovel bucket orientation provides the operator with more ways to get the job done faster. COMPASS Control Panel is a standard feature that allows the operator to easily adjust auxiliary flows to achieve the optimal work tool performance, activate auto idle or economy mode for improved fuel efficiency and utilize the security system to ensure protection of valuable assets with the simple touch of a button. The Site Reference System included in the COMPASS monitor provides output from pitch and roll sensors to aid in grading and level trenching. This impacts accuracy and productivity for job site finishing.

SERVICEABILITY

Convenient service and maintenance requirements include ease of access to daily check points, 500 hour engine oil and filter change period, 500 hour grease interval on front implement, S·O·SSM oil sampling valve and overall long term durability.

SAFETY

All Cat Mini Excavators from 3.5 metric tons to 8 metric tons are ROPS, TOPS and Top Guard Level 1 certified and include the Cat Interlock (hydraulic lockout) System, a certified accumulator which allows for auxiliary pressure to be released, making connecting and disconnecting work tools safer and easier, and a travel alarm. All of these safety features are standard on the E2 model lineup (travel alarm optional in Europe).

Sales Features

QUALITY

The durable hoods and frame and the compact radius design of the 304E2 let you work comfortably and confidently in confined areas. The operator environment includes a high quality suspension seat, easy to adjust armrests and 100% pilot controls which offer consistent and long-lasting controllability.

EFFICIENCY

High Definition Hydraulic System provides a load sensing and flow sharing capability leading to operational precision, efficient performance and greater controllability. Power on Demand provides optimal efficiency and performance the moment you need it. This automatic system ensures fuel efficiency through appropriate engine rating to meet all operational needs as required.

VERSATILITY

Broad range of Cat Work Tools make the Cat Mini Excavator a versatile machine able to meet the requirements of any job site. Over 200 degrees of bucket rotation provides greater material retention during truck loading and easier flat wall digging without having to reposition the machine.

PERFORMANCE

Front shovel bucket orientation provides the operator with more ways to get the job done faster. COMPASS Control Panel is a standard feature that allows the operator to easily adjust auxiliary flows to achieve the optimal work tool performance, activate auto idle or economy mode for improved fuel efficiency and utilize the security system to ensure protection of valuable assets with the simple touch of a button. The Site Reference System included in the COMPASS monitor provides output from pitch and roll sensors to aid in grading and level trenching. This impacts accuracy and productivity for job site finishing.

SERVICEABILITY

Front shovel bucket orientation provides the operator with more ways to get the job done faster. COMPASS Control Panel is a standard feature that allows the operator to easily adjust auxiliary flows to achieve the optimal work tool performance, activate auto idle or economy mode for improved fuel efficiency and utilize the security system to ensure protection of valuable assets with the simple touch of a button. The Site Reference System included in the COMPASS monitor provides output from pitch and roll sensors to aid in grading and level trenching. This impacts accuracy and productivity for job site finishing.

SAFETY

Front shovel bucket orientation provides the operator with more ways to get the job done faster. COMPASS Control Panel is a standard feature that allows the operator to easily adjust auxiliary flows to achieve the optimal work tool performance, activate auto idle or economy mode for improved fuel efficiency and utilize the security system to ensure protection of valuable assets with the simple touch of a button. The Site Reference System included in the COMPASS monitor provides output from pitch and roll sensors to aid in grading and level trenching. This impacts accuracy and productivity for job site finishing.
Standard Equipment
  • ENGINE
    • Cat C2.4 diesel engine (meets U.S. EPA Tier 4 Final emission standards for North America and EU Stage IIIA/Tier 4 Interim emission standards for all other regions)
    • Automatic engine idle
    • Automatic engine shut-off
    • Automatic two speed travel
    • Diesel Particulate Filter (North America only)
    • Diesel Oxidation Catalyst (North America only)
    • Fuel and water separator
    • Power on demand
  • HYDRAULIC SYSTEM
    • 1-way and 2-way (combined function)
    • Accumulator
    • Automatic swing parking brake
    • Auxiliary hydraulic lines
    • Adjustable auxiliary relief
    • Auxiliary line quick disconnects
    • Cat interlock system: hydraulic lockout
    • Continuous auxiliary flow
    • Ecology drain
    • Hydraulic oil cooler
    • High definition hydraulics
    • Load sensing/flow sharing
  • OPERATOR ENVIRONMENT
    • 100% pilot control ergonomic joysticks
    • Adjustable armrests
    • COMPASS: complete, operation, maintenance, performance and security system
      • Multiple languages
    • Cup holder
    • Hydraulic neutral lockout bar
    • Literature holder
    • Pattern changer (optional in Europe)
    • Site reference system: leveling
    • Tool storage area
    • Travel control pedals with hand levers
    • Washable floor mat
  • UNDERCARRIAGE
    • Dozer blade with float function
    • Track, rubber belt, 350 mm (14 in) width
    • Tie down eyes on track frame
    • Towing eye on base frame
  • FRONT LINKAGE
    • 200 degree bucket rotation
    • Certified lifting eye on bucket linkage (optional in Europe)
    • Front shovel capable
    • Thumb ready stick
  • ELECTRICAL
    • 12 volt electrical system
    • 60 ampere alternator
    • 650 CCA maintenance free battery
    • Fuse box
    • Ignition key start/stop switch
    • Slow blow fuse
    • Warning horn
  • LIGHTS AND MIRRORS
    • Boom light with time delay capability
  • SAFETY AND SECURITY
    • Anti-theft system (COMPASS)
    • Caterpillar Corporate “One Key” System
    • Door locks
    • Lockable fuel cap
    • Retractable seat belt
    • Roll Over Protective Structure (ROPS) (ISO 12117-2)
    • Tip Over Protective Structure (TOPS) (ISO 12117)
    • Top guard – ISO 10262 (Level 1)
    • Travel alarm (optional in Europe)
  • TECHNOLOGY
    • Product Link™
Optional Equipment
  • ENGINE
    • Engine block heater
  • HYDRAULIC SYSTEM
    • Quick coupler lines
    • Boom lowering check valve
    • Stick lowering check valve
    • Secondary auxiliary hydraulic lines
  • OPERATOR ENVIRONMENT
    • Cab:
      • Air conditioning
      • Heat
      • High back suspension seat
      • Interior light
      • Interlocking front window system
      • Radio
      • Windshield wiper
  • UNDERCARRIAGE
    • Power angle blade
    • Track, double grouser (steel), 350 mm (14 in)
  • FRONT LINKAGE
    • Quick coupler: manual or hydraulic
    • Thumb
    • Buckets
    • Full range of performance matched work tools
      • Auger, hammer, ripper
  • LIGHTS AND MIRRORS
    • Light, cab with time delay capability
    • Mirror, canopy right
    • Mirror, canopy left
    • Mirror, cab rear
  • SAFETY AND SECURITY
    • Battery disconnect
    • Beacon socket
    • Front wire mesh guard
    • Rearview camera
    • Vandal guard