New | 305.5E2 CR Mini Hydraulic Excavator

The Cat® 305.5E2 CR Mini Hydraulic Excavator delivers high performance, durability and versatility in a compact design to help you work in a variety of applications.

Engine ModelCat® C2.4
Net Power44.1 HP
Rated Net Power - 2,200 rpm - ISO 9249/EEC 80/126944.1 HP
Bore3.4 in
Stroke4 in
Displacement146 in³
Gross Power - ISO 1439645.7 HP
EmissionsMeets U.S. EPA Tier 4 Final/EU Stage IIIA emission standards.
Weight - Canopy, Standard Stick11503 lb
Operating Weight11958 lb
Weight - Cab, Long Stick11958 lb
Note*Weight includes counterweight, rubber tracks, bucket, operator, full fuel and auxiliary lines.
Weight - Cab, Standard Stick11863 lb
Weight - Canopy, Long Stick11596 lb
Travel System
Travel Speed - High2.8 mile/h
Maximum Traction Force - High Speed6025 lb
Travel Speed - Low1.7 mile/h
Maximum Traction Force - Low Speed10746 lb
Ground Pressure - Canopy4.5 psi
Ground Pressure - Cab4.6 psi
Gradeability - Maximum30°
Hydraulic System
Operating Pressure - Travel3553 psi
Digging Force - Stick - Long5575 lb
Operating Pressure - Swing3132 psi
Operating Pressure - Equipment3553 psi
Digging Force - Stick - Standard6500 lb
Pump Flow at 2,400 rpm39.6 gal/min
Auxiliary Circuit - Secondary (174 bar/2,524 psi)6.6 gal/min
Auxiliary Circuit - Primary (186 bar/2,734 psi)21.1 gal/min
Digging Force - Bucket11445 lb
TypeLoad Sensing Hydraulics with Variable Displacement Piston Pump
Swing System
Machine Swing Speed10 r/min
Boom Swing - Right50°
Boom Swing - Left - Without Stop*80°
Boom Swing - Left - With Stop*60°
Note*Automatic swing brake, spring applied, hydraulic release.
Width78 in
Height14.8 in
Dig Depth21.9 in
Lift Height15.9 in
Service Refill Capacities
Hydraulic Tank18 gal (US)
Cooling System2.8 gal (US)
Fuel Tank16.6 gal (US)
Engine Oil2.5 gal (US)
Hydraulic System20.6 gal (US)
Operating Specifications
Stick Length - Long70 in
Counterweight364.4 lb
Stick Length - Standard55 in
Dimensions - Standard Stick
Boom In Reach94 in
O/A Shipping Height100 in
Dig Depth137 in
Maximum Blade Depth22 in
Track Belt/Shoe Width16 in
O/A Undercarriage Length102 in
Maximum Blade Height16 in
O/A Shipping Length210 in
Maximum Reach - Ground Level222 in
Boom Swing - Right31 in
Maximum Dig Height210 in
Vertical Wall92 in
Tail Swing44 in
Boom Height - Shipping Position69 in
Boom Swing - Left27 in
O/A Track Width78 in
Maximum Dump Clearance150 in
Swing Bearing - Height24 in
Maximum Reach228 in
Number of Carrier Rollers1
Track Roller TypeCenter Flange
Number of Track Rollers4
Lift Capacities at Ground Level - Lift Point Radius: 3000 mm (9'8”)
Blade Up - Front3417 lb
Blade Up - Side2535 lb
Blade Down - Side2844 lb
Blade Down - Front5710 lb
Lift Capacities at Ground Level - Lift Point Radius: 4500 mm (14'9”)
Blade Down - Front3042 lb
Blade Up - Side1367 lb
Blade Up - Front1808 lb
Blade Down - Side1521 lb
Dimensions - Long Stick
Boom Swing - Right31 in
O/A Shipping Length215 in
Vertical Wall107 in
O/A Shipping Height100 in
Maximum Blade Depth22 in
Maximum Dump Clearance161 in
Maximum Reach - Ground Level237 in
Maximum Blade Height16 in
Tail Swing44 in
Swing Bearing - Height24 in
Dig Depth152 in
Maximum Dig Height220 in
Boom Swing - Left27 in
Track Belt/Shoe Width16 in
Maximum Reach243 in
O/A Track Width78 in
Boom In Reach100 in
O/A Undercarriage Length102 in
Boom Height - Shipping Position85 in
Certification - Cab and Canopy
Tip Over Protective Structure (TOPS)ISO 12117
Top GuardISO 10262 (Level I)
Roll Over Protective Structure (ROPS)ISO 12117-2
Dynamic Operator Sound Pressure Level (ISO 6396:2008)81 dB(A)
Note*European Union Directive “2000/14/EC”
Exterior Sound Power Level - ISO 6395:2008*97 dB(A)
Air Conditioning System
Air ConditioningThe 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.

The Durable Hoods And Frame And The Compact Radius Design Of The 305.5e2 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.

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.

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.

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 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.

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.

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).

Standard Equipment

  • 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
  • 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
  • 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
  • Dozer blade with float function
  • Track, rubber belt, 400 mm (16 in) width
  • Tie down eyes on track frame
  • Towing eye on base frame
  • 200 degree bucket rotation
  • Certified lifting eye on bucket linkage (optional in Europe)
  • Front shovel capable
  • Thumb ready stick
  • 12 volt electrical system
  • 60 ampere alternator
  • 650 CCA maintenance free battery
  • Fuse box
  • Ignition key start/stop switch
  • Slow blow fuse
  • Warning horn
  • Boom light with time delay capability
  • 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)
  • Product Link™

Optional Equipment

  • Engine block heater
  • Quick coupler lines
  • Boom lowering check valve
  • Stick lowering check valve
  • Secondary auxiliary hydraulic lines
  • Cab:
    • Air conditioning
    • Heat
    • High back suspension seat
    • Interior light
    • Interlocking front window system
    • Radio
    • Windshield wiper
  • Power angle blade
  • Track, double grouser (steel), 400 mm (16 in)
  • Track, double grouser (steel) with rubber pad, 400 mm (16 in)
  • Quick coupler: manual or hydraulic
  • Thumb
  • Buckets
  • Full range of performance matched work tools
    • Auger, hammer, ripper
  • Light, cab with time delay capability
  • Mirror, canopy right
  • Mirror, canopy left
  • Mirror, cab rear
  • Battery disconnect
  • Beacon socket
  • Front wire mesh guard
  • Rearview camera
  • Vandal guard
  • Counterweight, extra



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