303.5E2 CR Mini Excavator

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Net Power23.5 HP (17.5 kW)
Operating Weight8209 lb (3723 kg)
Maximum Dig Depth125 in (3180 mm)
Operating Weight - With Cab8209 lb (3723 kg)
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 Power23.5 HP (17.5 kW)
Operating Weight8209 lb (3723 kg)
Maximum Dig Depth125 in (3180 mm)
Operating Weight - With Cab8209 lb (3723 kg)
Engine ModelCat® C1.7
Gross Power24.8 HP (18.5 kW)
Machine Swing Speed10 r/min (10 r/min)
Width70 in (1780 mm)
Height13 in (325 mm)
Dig Depth19 in (470 mm)
Lift Height16 in (400 mm)
Cooling System1.5 gal (US) (5.5 l)
Engine Oil1.8 gal (US) (7 l)
Hydraulic Tank11.2 gal (US) (42.3 l)
Ground Pressure4.6 psi (31.7 kPa)
Fuel Tank12.2 gal (US) (46 l)
Boom Swing - Left - Without Stop80°
Hydraulic System17.2 gal (US) (65 l)
Rated Net Power - ISO 924923.5 HP (17.5 kW)
Net Power - ISO 924923.5 HP (17.5 kW)
NoteCat C1.7 engine meets U.S. EPA Tier 4 Final/EU Stage IIIB emission standards.
Operating Weight - With Canopy7803 lb (3539 kg)
NoteWeight includes rubber tracks, bucket, operator, full fuel and auxiliary lines.
Swing - Right50°
Maximum Auxiliary Circuit - Primary - Flow at Pump15.9 gal/min (60 l/min)
Boom Swing - Left - With Stop55°
Operating Pressure - Equipment3553 psi (245 bar)
Bore3.4 in (87 mm)
Displacement104 in³ (1.7 l)
Stroke3.6 in (92.4 mm)
Travel Speed - Low2 mile/h (3.2 km/h)
Maximum Traction Force - High Speed3822 lbf (17 kN)
Travel Speed - High2.9 mile/h (4.6 km/h)
Maximum Traction Force - Low Speed6992 lbf (31.1 kN)
Digging Force - Stick - Standard4249 lbf (18.9 kN)
Maximum Auxiliary Circuit - Secondary - Pressure at Pump3553 psi (24500 kPa)
Pump Flow at 2,200 rpm26.4 gal/min (100 l/min)
Operating Pressure - Travel3553 psi (245 bar)
Operating Pressure - Swing3132 psi (216 bar)
Digging Force - Stick - Long3799 lbf (16.9 kN)
TypeLoad Sensing Hydraulics with Variable Displacement Piston Pump
NoteFlow and pressure are not combinable. Under load, as flow rises pressure goes down.
Maximum Auxiliary Circuit - Secondary - Flow at Pump6.6 gal/min (25 l/min)
Maximum Auxiliary Circuit - Primary - Pressure at Pump3553 psi (24500 kPa)
Digging Force - Bucket7419 lbf (33 kN)

Benefits and Features

Comfortable Working Environment

The high quality suspension seat, 76 mm (3 in) retractable seat belt, easy to adjust armrests, and ergonomic layout provide superior comfort and reduce operator fatigue. The new interlocking front window system, updated operator interface and 100% pilot controls provide a best-in-class operator station and customer value.

Joystick Controls

The boom swing and auxiliary hydraulic functions are located at your fingertips providing smooth, easy operation. They also eliminate foot pedals and free up the floor for more room for the operator's feet. 100% pilot controls provide consistent flow and pressure throughout the life of the machine. This allows all controls to be locked out while starting the machine.

Powerful Digging, Precise Control

The new High Definition Hydraulic (HDH) System in the E2 machines provides a load sensing and flow sharing capability leading to operational precision, efficient performance and greater control. By combining variable pump efficiency, open center valve simplicity, and a simple architecture the valve achieves controllability. The simple valve architecture reduces heat which leads to a reduction in hydraulic instability and improved overall efficiency.

200 Degree Bucket Rotation

Industry leading bucket rotation of over 200 degrees provides greater material retention during truck loading. It also allows for easier vertical wall digging without repositioning the machine.


Each of the E2 models is equipped with the engine solution to best support the power and performance required based on the weight class and application. Also, standard features like auto idle offer consistent lower engine speeds to increase engine life and offer fuel savings. Smart Technology is a new feature of the 303.5E2. Through the integration of this technology with the U.S. EPA Tier 4 Final 23.5 hp (17.6 kW) engine, the machine is able to meet and exceed performance of the previous generation 303.5E. Additionally, testing on the 303.5E2 revealed an 8% fuel economy improvement and 7% greater efficiency over the E Series.

Automatic Two Speed

With the standard automatic two speed feature, the machine will automatically balance high speed and torque travel requirements based on job site conditions to give the operator the optimum speed and control. The machine can be put in low gear if slower travel is desired while in tight conditions.

UNLOCK the new features and experience the value of the exclusive COMPASS control panel on the E2 Series compact excavators

The COMPASS control panel on the Cat E2 Series mini hydraulic excavators was specifically designed by Caterpillar for compact excavators. It adds several new features to the machines increasing the amount of customer value. All of the following features are now standard on all E2 Series models. Complete – All of the control panel features are standard; Operation – Simple operation of the pattern changer, hydraulic quick coupler and fuel gauge visibility all at the push of a button; Maintenance – Maintenance intervals, diagnostics and work hours; Performance – Save up to 20% fuel while maintaining optimum performance levels; And; Security – Anti-theft device with individual user and master passwords; System – Ergonomically designed control panel

Passcode Protected Security System

A standard anti-theft device now comes on every E2 Series compact excavator. A five digit alphanumeric password is required to start the machine when the anti-theft feature is enabled. There is a master password and up to five user passwords can be created by the owner if desired. Keep your machine safe on a busy job site by locking it when you are not around.

Adjustable Auxiliary Work Tool Flow Control

The E2 Series machines now have simple adjustability of the flow going down the boom and stick to the work tool. Both the standard main line and optional secondary auxiliary hydraulics can be adjusted on a scale of 1–15 through a few buttons on the control panel. Adjust the flow to your different tools with a simple push of a button.

Continuous Flow

Once this feature is enabled through a button on the monitor, the E2 Series machines can run in continuous flow mode. With the auxiliary hydraulics on the right hand joystick, just hold the roller switch at the desired flow rate and direction for 2.5 seconds and the machine will maintain that flow rate until it is turned off. Maintain hydraulic flow to your tools at any flow and in any direction with the simple push of a button.

Pattern Changer

Change the operating pattern between excavator and backhoe with a simple press of a button from the comfort of the cab. Exclusive push button pattern changer is safe and easy.

Maintenance and Performance Information

Easily keep track of various maintenance and performance parameters of your machine. Reset the maintenance intervals and ensure the machine is receiving proper care maximizing the life of the machine.

Compact Radius

The compact radius design gives greater machine versatility and the capability to work within confined areas. This allows the operator to concentrate on the work being done without having to worry about damaging the back of the machine or other job site obstacles.

Zero Tail Swing

The 303.5E2 CR model features a zero tail swing design. On this model, the radius of the upper body stays entirely within the width of the undercarriage.

Rubber Track

The standard rubber track lets you work on multiple surfaces such as grass, pavement or stone without damaging the surface or machine.

Steel Track Option

Optional steel track is available for harsh conditions such as demolition. The extra weight of the steel tracks generally provides better stability when digging over the side of the machine.

Simple Dozer Control with Float Function

The dozer function is pilot controlled from inside the cab, providing smooth, proportional operation. The standard float function is enabled by pushing the lever fully forward into the detent position. Cleanup and backfilling is easier since the operator does not have to adjust the blade height during travel.

Excellent Blade Visibility

Visibility to the blade is excellent in any position, allowing the blade to be positioned behind the operator and away from the front linkage for better access when back dragging and finishing in tight areas.

Angle Blade Option

Increase machine versatility with the Cat angle dozer blade. Built for strength and durability, the hydraulic angle blade features a hardened steel wear edge and good protection to cylinders and hydraulic lines. The angle blade can be positioned straight ahead or angled up to 25 degrees to the left or right. This reduces the number of times required to back up and reposition when backfilling so you can finish the job faster. All functions of the blade are controlled with one joystick using a proportional roller switch for the angle function.


The E2 Series is available with a mechanical pin-grabber or a hydraulic pin-grabber quick coupler option. The coupler design uses a wedge to keep the tool secure to the coupler, reducing wear and maintaining a tight fit through the life of the coupler. The hydraulic coupler allows the operator to change tools without leaving the comfort of the cab.

Wide Range of Work Tools

A wide range of Cat Work Tools have been designed specifically for the Cat Mini Hydraulic Excavators to maximize machine performance. Available work tools include:

  • Buckets (heavy duty and heavy duty capacity)
  • Tilting, Ditch Cleaning Buckets
  • Hydraulic Hammers
  • Augers
  • Thumbs (not available in all regions)
  • Vibratory Compactors
  • Quick Coupler

Standard Thumb Ready Sticks

Machines come standard with stick mounted brackets, ready to fit a hydraulic thumb for even greater machine versatility. A factory installed bracket and relief valve make hydraulic thumb installation simple and cost-effective.

Standard Auxiliary Lines and Accumulator

One-way and two-way auxiliary lines (combined function), including quick connections, are fitted as standard equipment so the machine comes ready to work. A standard accumulator allows for auxiliary pressure to be released, making connecting and disconnecting work tools safer and easier.

Easy Service

Extended service intervals, durable components, and ease of service access points decrease your owning and operating costs while increasing your long-term value.

  • Lifting side hood allows access to air filter, main implement valve, 1-way/2-way auxiliary flow selector, accumulator, fuel filter and hydraulic tank. This eliminates the need to lift the cab when maintaining and servicing the machine.
  • Swing open door provides access to major components and service points including engine oil check and fill, vertically mounted engine oil filter, starter motor and alternator.
  • Easy access to the radiator and oil cooler results in simplified cleaning and reduced maintenance times.
  • S·O·SSM oil sampling valve allows easy sampling of the hydraulic fluid for preventative maintenance.
  • 500 hour engine oil and filter change period reduces operating costs and machine downtime.

Customer Support You Can Count On

Your Cat dealer is ready to assist you with your purchase decision and everything after.

  • Financing packages are flexible to meet your needs.
  • Unmatched parts availability keeps you working.
  • Make comparisons of machines, with estimates of component life, preventative maintenance and cost of production.
  • Your Cat dealer can evaluate the cost to repair, rebuild and replace your machine.
  • For more information on Cat products, dealer services and industry solutions, visit www.cat.com.

Standard Equipment

  • Cat C1.7 Tier 4 Final diesel engine
  • Automatic engine idle
  • Automatic engine shut-off
  • Automatic two speed travel
  • Fuel and water separator
  • 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
  • Site reference system: leveling
  • Tool storage area
  • Travel control pedals with hand levers
  • Washable floor mat
  • Dozer blade with float function
  • Track, rubber belt, 300 mm (12 in) width
  • Tie down eyes on track frame
  • Towing eye on base frame
  • 200 degree bucket rotation
  • Certified lifting eye on bucket linkage
  • 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 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), 300 mm (12 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
  • Product Link™