305.5E2 CR Mini Excavator with Swing Boom

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Net Power44.1 HP (32.9 kW)
Operating Weight11958 lb (5423 kg)
Dig Depth152 in (3870 mm)
Engine ModelCat® C2.4
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 Power44.1 HP (32.9 kW)
Operating Weight11958 lb (5423 kg)
Dig Depth152 in (3870 mm)
Engine ModelCat® C2.4
Machine Swing Speed10 r/min (10 r/min)
Width78 in (1980 mm)
Height14.8 in (375 mm)
Dig Depth21.9 in (555 mm)
Lift Height15.9 in (405 mm)
Boom Height - Shipping Position85 in (2150 mm)
Swing Bearing - Height24 in (615 mm)
Roll Over Protective Structure (ROPS)ISO 12117-2
Dynamic Operator Sound Pressure Level (ISO 6396:2008)81 dB(A) (81 dB(A))
Tip Over Protective Structure (TOPS)ISO 12117
Vertical Wall92 in (2330 mm)
Boom Swing - Left27 in (695 mm)
Maximum Dig Height220 in (5590 mm)
Maximum Dig Height210 in (5330 mm)
Blade Down - Side1521 lb (690 kg)
Tail Swing44 in (1130 mm)
Ground Pressure - Cab4.6 psi (31.9 kPa)
Maximum Blade Height16 in (405 mm)
Boom Swing - Right31 in (785 mm)
Weight - Cab, Standard Stick11863 lb (5380 kg)
Blade Down - Side2844 lb (1290 kg)
Blade Up - Front1808 lb (820 kg)
Maximum Reach - Ground Level237 in (6020 mm)
Blade Up - Side1367 lb (620 kg)
Maximum Dump Clearance161 in (4080 mm)
TypeLoad Sensing Hydraulics with Variable Displacement Piston Pump
Stick Length - Standard55 in (1420 mm)
Track Belt/Shoe Width16 in (400 mm)
Tail Swing44 in (1130 mm)
EmissionsMeets U.S. EPA Tier 4 Final/EU Stage IIIA emission standards.
Top GuardISO 10262 (Level I)
Note*Automatic swing brake, spring applied, hydraulic release.
O/A Undercarriage Length102 in (2580 mm)
Exterior Sound Power Level - ISO 6395:2008*97 dB(A) (97 dB(A))
Note*European Union Directive “2000/14/EC”
Gross Power - ISO 1439645.7 HP (34.1 kW)
Maximum Reach228 in (5790 mm)
Boom In Reach100 in (2530 mm)
Swing Bearing - Height24 in (615 mm)
O/A Track Width78 in (1980 mm)
Gradeability - Maximum30°
Weight - Canopy, Long Stick11596 lb (5259 kg)
Maximum Dump Clearance150 in (3820 mm)
Blade Down - Front5710 lb (2590 kg)
O/A Track Width78 in (1980 mm)
Boom Swing - Left27 in (695 mm)
Boom Height - Shipping Position69 in (1740 mm)
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.
Digging Force - Bucket11445 lb (50.9 kN)
O/A Shipping Length210 in (5330 mm)
Maximum Reach243 in (6170 mm)
Maximum Reach - Ground Level222 in (5630 mm)
Dig Depth137 in (3470 mm)
Maximum Blade Height16 in (405 mm)
Operating Pressure - Swing3132 psi (216 bar)
Boom Swing - Left - Without Stop*80°
Boom Swing - Right50°
Maximum Auxiliary Circuit - Primary - Flow21.1 gal/min (80 l/min)
Maximum Auxiliary Circuit - Secondary - Flow6.6 gal/min (25 l/min)
Maximum Auxiliary Circuit - Secondary - Pressure3553 psi (24500 kPa)
Maximum Auxiliary Circuit - Primary - Pressure3553 psi (24500 kPa)
Pump Flow at 2,400 rpm39.6 gal/min (150 l/min)
Digging Force - Stick - Standard6500 lb (28.9 kN)
Operating Pressure - Equipment3553 psi (245 bar)
Digging Force - Stick - Long5575 lb (24.8 kN)
Hydraulic Tank18 gal (US) (68.3 l)
Operating Pressure - Travel3553 psi (245 bar)
Maximum Traction Force - Low Speed10746 lb (47.8 kN)
Travel Speed - Low1.7 mile/h (2.8 km/h)
Maximum Traction Force - High Speed6025 lb (26.8 kN)
Travel Speed - High2.8 mile/h (4.5 km/h)
Displacement146 in³ (2.4 l)
Stroke4 in (102.4 mm)
Bore3.4 in (87 mm)
Weight - Canopy, Standard Stick11503 lb (5217 kg)
Net Power - 2,200 rpm - ISO 9249/EEC 80/126944.1 HP (32.9 kW)
Boom Swing - Left - With Stop*60°
Cooling System2.8 gal (US) (10.5 l)
O/A Undercarriage Length102 in (2580 mm)
Boom Swing - Right31 in (785 mm)
Track Belt/Shoe Width16 in (400 mm)
Maximum Blade Depth22 in (555 mm)
Maximum Blade Depth22 in (555 mm)
Counterweight364.4 lb (165.3 kg)
Note*Weight includes counterweight, rubber tracks, bucket, operator, full fuel and auxiliary lines.
O/A Shipping Height100 in (2550 mm)
Vertical Wall107 in (2730 mm)
Track Roller TypeCenter Flange
O/A Shipping Length215 in (5460 mm)
Blade Up - Side2535 lb (1150 kg)
Fuel Tank16.6 gal (US) (63 l)
Blade Down - Front3042 lb (1380 kg)
Blade Up - Front3417 lb (1550 kg)
Number of Carrier Rollers1
Ground Pressure - Canopy4.5 psi (31 kPa)
O/A Shipping Height100 in (2550 mm)
Weight - Cab, Long Stick11958 lb (5423 kg)
Boom In Reach94 in (2400 mm)
Stick Length - Long70 in (1820 mm)
Hydraulic System20.6 gal (US) (78 l)
Engine Oil2.5 gal (US) (9.5 l)
Number of Track Rollers4

Benefits and Features

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