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.


Net Power 44.1HP
Engine Model Cat® C2.4
Bore 3.4in
Stroke 4in
Displacement 146in³
Net Power - 2,200 rpm - ISO 9249/EEC 80/1269 44.1HP
Gross Power - ISO 14396 45.7HP
Emissions Meets U.S. EPA Tier 4 Final/EU Stage IIIA emission standards.


Operating Weight 11958lb
Note *Weight includes counterweight, rubber tracks, bucket, operator, full fuel and auxiliary lines.
Weight - Canopy, Standard Stick 11503lb
Weight - Cab, Long Stick 11958lb
Weight - Cab, Standard Stick 11863lb
Weight - Canopy, Long Stick 11596lb

Dimensions - Long Stick

Dig Depth 152in
Boom Swing - Right 31in
O/A Shipping Length 215in
Vertical Wall 107in
O/A Shipping Height 100in
Maximum Blade Depth 22in
Maximum Dump Clearance 161in
Maximum Reach - Ground Level 237in
Maximum Blade Height 16in
Tail Swing 44in
Swing Bearing - Height 24in
Maximum Dig Height 220in
Boom Swing - Left 27in
Track Belt/Shoe Width 16in
Maximum Reach 243in
O/A Track Width 78in
Boom In Reach 100in
O/A Undercarriage Length 102in
Boom Height - Shipping Position 85in

Swing System

Machine Swing Speed 10r/min
Boom Swing - Right 50°
Boom Swing - Left - Without Stop* 80°
Boom Swing - Left - With Stop* 60°
Note *Automatic swing brake, spring applied, hydraulic release.


Width 78in
Height 14.8in
Dig Depth 21.9in
Lift Height 15.9in

Travel System

Travel Speed - High 2.8mile/h
Maximum Traction Force - High Speed 6025lb
Travel Speed - Low 1.7mile/h
Maximum Traction Force - Low Speed 10746lb
Ground Pressure - Canopy 4.5psi
Gradeability - Maximum 30°
Ground Pressure - Cab 4.6psi

Hydraulic System

Operating Pressure - Travel 3553psi
Digging Force - Stick - Long 5575lb
Operating Pressure - Swing 3132psi
Operating Pressure - Equipment 3553psi
Digging Force - Stick - Standard 6500lb
Pump Flow at 2,400 rpm 39.6gal/min
Maximum Auxiliary Circuit - Primary - Pressure 3553psi
Maximum Auxiliary Circuit - Secondary - Pressure 3553psi
Maximum Auxiliary Circuit - Secondary - Flow 6.6gal/min
Maximum Auxiliary Circuit - Primary - Flow 21.1gal/min
Digging Force - Bucket 11445lb
Type Load Sensing Hydraulics with Variable Displacement Piston Pump

Service Refill Capacities

Hydraulic Tank 18gal (US)
Cooling System 2.8gal (US)
Fuel Tank 16.6gal (US)
Engine Oil 2.5gal (US)
Hydraulic System 20.6gal (US)

Dimensions - Standard Stick

Boom In Reach 94in
O/A Shipping Height 100in
Dig Depth 137in
Maximum Blade Depth 22in
Track Belt/Shoe Width 16in
O/A Undercarriage Length 102in
Maximum Blade Height 16in
O/A Shipping Length 210in
Maximum Reach - Ground Level 222in
Boom Swing - Right 31in
Maximum Dig Height 210in
Vertical Wall 92in
Tail Swing 44in
Boom Height - Shipping Position 69in
Boom Swing - Left 27in
O/A Track Width 78in
Maximum Dump Clearance 150in
Swing Bearing - Height 24in
Maximum Reach 228in


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

Lift Capacities at Ground Level - Lift Point Radius: 3000 mm (9'8”)

Blade Up - Front 3417lb
Blade Up - Side 2535lb
Blade Down - Side 2844lb
Blade Down - Front 5710lb

Operating Specifications

Counterweight 364.4lb
Stick Length - Standard 55in
Stick Length - Long 70in

Certification - Cab and Canopy

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


Note *European Union Directive “2000/14/EC”
Dynamic Operator Sound Pressure Level (ISO 6396:2008) 81dB(A)
Exterior Sound Power Level - ISO 6395:2008* 97dB(A)

Lift Capacities at Ground Level - Lift Point Radius: 4500 mm (14'9”)

Blade Down - Front 3042lb
Blade Up - Side 1367lb
Blade Up - Front 1808lb
Blade Down - Side 1521lb

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.

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, 400 mm (16 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), 400 mm (16 in)
    • Track, double grouser (steel) with rubber pad, 400 mm (16 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
  • Other Attachments
    • Counterweight, extra