303.5E2 CR Hydraulic Excavator

The Cat E2 Series Mini Hydraulic Excavators are designed to carry on the solid performance of their E Series predecessors, while adding even greater value for the customer. The new High Definition Hydraulic (HDH) System, redesigned operator station and enhanced digital control panel specially designed for Cat Mini Excavators – COMPASS (Complete, Operation, Maintenance, Performance And Security System) – are all standard features that improve performance and increase value.


Net Power 23.5HP
Engine Model Cat® C1.7
Gross Power 24.8HP
Bore 3.4in
Displacement 104in³
Stroke 3.6in
Rated Net Power - ISO 9249 23.5HP
Net Power - ISO 9249 23.5HP
Note Cat C1.7 engine meets U.S. EPA Tier 4 Final/EU Stage IIIB emission standards.


Operating Weight 8209lb
Operating Weight - With Cab 8209lb
Operating Weight - With Canopy 7803lb
Note Weight includes rubber tracks, bucket, operator, full fuel and auxiliary lines.

Operating Specifications

Maximum Dig Depth 125in

Swing System

Machine Swing Speed 10r/min
Boom Swing - Left - With Stop 55°
Swing - Right 50°
Boom Swing - Left - Without Stop 80°


Width 70in
Height 13in
Dig Depth 19in
Lift Height 16in

Service Refill Capacities

Cooling System 1.5gal (US)
Engine Oil 1.8gal (US)
Hydraulic Tank 11.2gal (US)
Fuel Tank 12.2gal (US)
Hydraulic System 17.2gal (US)

Travel System

Ground Pressure 4.6psi
Travel Speed - Low 2mile/h
Maximum Traction Force - High Speed 3822lbf
Travel Speed - High 2.9mile/h
Maximum Traction Force - Low Speed 6992lbf

Hydraulic System

Operating Pressure - Equipment 3553psi
Digging Force - Stick - Standard 4249lbf
Operating Pressure - Travel 3553psi
Operating Pressure - Swing 3132psi
Digging Force - Stick - Long 3799lbf
Digging Force - Bucket 7419lbf
Note Flow and pressure are not combinable. Under load, as flow rises pressure goes down.
Pump Flow at 2,200 rpm 26.4gal/min
Type Load Sensing Hydraulics with Variable Displacement Piston Pump
Maximum Auxiliary Circuit - Secondary - Flow at Pump 6.6gal/min
Maximum Auxiliary Circuit - Primary - Pressure at Pump 3553psi
Maximum Auxiliary Circuit - Primary - Flow at Pump 15.9gal/min
Maximum Auxiliary Circuit - Secondary - Pressure at Pump 3553psi

Standard Equipment

  • Engine
    • Cat C1.7 Tier 4 Final diesel engine
    • Automatic engine idle
    • Automatic engine shut-off
    • Automatic two speed travel
    • Fuel and water separator
  • 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
    • 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, 300 mm (12 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
    • 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 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), 300 mm (12 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
  • Technology
    • Product Link