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303 (3.3T)

303 (3.3T)

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Product specifications for 303 CR Mini Excavators

The Cat® 303 CR Mini Excavator delivers power and performance in a compact size to help you work in a wide range of applications.



Net Power 17.6 kW
Engine Model C1.1 Turbo
Bore 77 mm
Net Power - 2,400 rpm - ISO 9249, 80/1269/EEC 17.6 kW
Emissions Meets U.S. EPA Tier 4 Final and EU Stage V emission standards.
Stroke 81 mm
Note Advertised power is tested per the specified standard in effect at the time of manufacture.
Displacement 1.1 l
Gross Power - 2,400 rpm - SAE J1995:2014 18.4 kW

Operating Weight 3545 kg
Note (1) *Minimum Weight is based on fixed rubber tracks, operator, full fuel tank, standard stick, blade, bucket and no extra counterweight.
EU: CE Plate Weight with Canopy*** 3080 kg
Minimum Operating Weight with Canopy* 3025 kg
Minimum Operating Weight with Cab* 3140 kg
Note (3) ***CE Plate Weight is based on the most common EU configuration. Includes 75 kg (165 lb) operator and full fuel tank and excludes bucket.
Maximum Operating Weight with Canopy** 3425 kg
EU: CE Plate Weight with Cab*** 3180 kg
Maximum Operating Weight with Cab** 3545 kg
Note (2) **Maximum Weight is based on steel tracks, operator, full fuel tank, long stick, blade, bucket and extra counterweight.
Dimensions - Long Stick

Dig Depth 2950 mm
Boom Height - Shipping Position 1920 mm
Tail Swing with Counterweight 890 mm
Track Belt/Shoe Width 300 mm
Maximum Reach 5240 mm
Boom In Reach 1910 mm
Boom Swing - Right 870 mm
Tail Swing 845 mm
Maximum Dump Clearance 3310 mm
Ground Clearance 310 mm
O/A Undercarriage Length 2070 mm
O/A Shipping Height 2480 mm
Track Width - Expanded 1550 mm
Maximum Blade Depth 535 mm
Maximum Reach - Ground Level 5110 mm
Stick Length 1560 mm
Overall Shipping Length* 4560 mm
Maximum Dig Height 4650 mm
Swing Bearing - Height 570 mm
Note *Overall Shipping Length depends on blade position during shipment.
Tail Swing without Counterweight 775 mm
Maximum Blade Height 385 mm
Boom Swing - Left 640 mm
Vertical Wall 2070 mm

Height 350 mm
Width 1550 mm
Dimensions - Standard Stick

Maximum Blade Depth 535 mm
Tail Swing without Counterweight 775 mm
Maximum Dig Height 4510 mm
O/A Undercarriage Length 2070 mm
Boom Height - Shipping Position 1600 mm
Vertical Wall 1820 mm
Overall Shipping Length* 4510 mm
Boom Swing - Left 640 mm
O/A Shipping Height 2480 mm
Track Shoe Width 1550 mm
Boom Swing - Right 870 mm
Tail Swing with Extra Counterweight 890 mm
Swing Bearing - Height 570 mm
Tail Swing 845 mm
Maximum Blade Height 385 mm
Dig Depth 2650 mm
Maximum Dump Clearance 3170 mm
Maximum Reach - Ground Level 4830 mm
Maximum Reach 4980 mm
Ground Clearance 310 mm
Track Belt/Shoe Width 300 mm
Boom In Reach 1750 mm
Stick Length 1260 mm
Note *Overall Shipping Length depends on blade position during shipment.
Swing System

Boom Swing - Right 50 °
Machine Swing Speed 9 r/min
Boom Swing - Left 75 °

Average Exterior Sound Pressure (ISO 6395:2008) 94 dB(A)
Operator Sound Pressure (ISO 6396:2008) 78 dB(A)
Note European Union Directive “2000/14/EC”
Hydraulic System

Auxiliary Circuit - Primary - Flow 65 l/min
Auxiliary Circuit - Secondary - Pressure 245 bar
Operating Pressure - Swing 176 bar
Pump Flow at 2,400 rpm 100 l/min
Type Load Sensing Hydraulics with Variable Displacement Piston Pump
Digging Force - Stick - Standard 16.6 kN
Operating Pressure - Travel 245 bar
Digging Force - Bucket 28.4 kN
Operating Pressure - Equipment 245 bar
Auxiliary Circuit - Primary - Pressure 245 bar
Auxiliary Circuit - Secondary - Flow 25 l/min
Digging Force - Stick - Long 14.8 kN
Note * Flow and pressure are not combinable. Under load, as flow rises pressure goes down.
Travel System

Gradeability - Maximum 30 degrees
Ground Pressure - Maximum Weight 32.3 kPa
Ground Pressure - Minimum Weight 27.6 kPa
Travel Speed - High 4.5 km/h
Maximum Traction Force - Low Speed 31.4 kN
Travel Speed - Low 2.6 km/h
Maximum Traction Force - High Speed 14.7 kN
Service Refill Capacities

Cooling System 4 l
Hydraulic Tank 18 l
Engine Oil 4 l
Fuel Tank 45 l
Hydraulic System 35 l
Weight Increase from Minimum Configuration

Counterweight 100 kg
Cab 115 kg
Steel Tracks 125 kg
Long Stick 25 kg
Extra Counterweight 250 kg
Certification - Cab and Canopy

Roll Over Protective Structure (ROPS) ISO 12117-2:2008
Top Guard ISO 10262:1998 (Level I)
Tip Over Protective Structure (TOPS) ISO 12117:1997

Recyclability 95%


  • Choose either a canopy or a sealed and pressurized cab which can be equipped with air conditioning, adjustable wrist rests, and a suspension seat option to help keep you working comfortably all day long.


  • Controls are easy to use and the intuitive Next Generation LCD monitor provides easy to read machine information. An advanced touchscreen monitor can also be equipped.


  • Moving around the job site is even easier with the Cat Stick Steer option. Easily switch from traditional travel controls with levers and pedals to joystick controls to move the machine and to operate the blade. The benefit of less effort and improved control is in your hands!


  • Strong lift and dig performance helps you get the job done faster. The compact radius design lets you access and work in the tightest areas. Dozer float allows for easy clean up.


  • Your safety is our top priority. The Cat mini excavator is designed to help keep you safe on the job. Courtesy work lights and a fluorescent retractable seat belt with optional seat belt reminder system are just a couple of the safety features we’ve built into the machine.


  • Maintenance is quick and easy on the Cat mini excavator. Routine check points are easy to access at ground level through the side doors. The unique tilt up cab or canopy lets you reach additional service areas when needed.


  • Equipped with features such as auto idle, auto engine shutdown, and efficient hydraulics with a variable displacement pump, the Cat mini excavator was designed with reducing your operating costs in mind.


  • Your Cat dealer is here to help you reach your business goals. From providing equipment solutions to operator training to service needs and beyond, your Cat dealer is ready to help.


  • The Cat® C1.1 engine meets U.S. EPA Tier 4 Final, EU Stage V, and Japan 2014 emission standards.
  • Cat diesel engines are required to use ULSD (ultra-low sulfur diesel fuel with 15 ppm of sulfur or less) or ULSD blended with the following lower-carbon intensity fuels up to: 20% biodiesel FAME (fatty acid methyl ester) * or 100% renewable diesel, HVO (hydrotreated vegetable oil) and GTL (gas-to-liquid) fuels. Refer to guidelines for successful application. Please consult your Cat dealer or “Caterpillar Machine Fluids Recommendations” (SEBU6250) for details.
  • Auto Idle helps reduce unnecessary fuel burn and greenhouse gas emissions by allowing the engine to automatically go into idle mode when the machine is not working.
  • Engine Idle Shutdown Timer reduces fuel burn, greenhouse gas emissions and unnecessary idle time by shutting down the machine after a pre-set idling period.
  • Cruise control helps you maintain a constant speed as you travel across your jobsite saving fuel and reducing greenhouse gas emissions.
  • The Cat® Seat Belt Reminder provides audible and visual warnings to remind operators to buckle up during machine operation. The easy-to-install system is compatible with all equipment brands to help ensure operator safety.
  • Extended maintenance intervals not only reduce downtime but decrease the amount of fluid and filters that are replaced over the life of the machine.
  • Remote Flash minimizes downtime and maintenance time while keeping your asset running with maximum efficiency. Alerts for machine updates are sent virtually from your Cat dealer and updates can be deployed without a dealer technician needing to be onsite.(if equipped)
  • Remote Troubleshoot decreases maintenance time and keeps your machine running with maximum efficiency by allowing your Cat dealer to virtually test the machine while working. Once a problem is identified, a technician can fix it the first time, saving time and money.(if equipped)
*Engines with no aftertreatment devices can use higher blends, up to 100% biodiesel. (for use of blends higher than 20% biodiesel, consult your Cat dealer)
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