Compact excavator caterpillar 303 performance.
The Cat® 303 CR Mini Excavator delivers power and performance in a compact size to help you work in a wide range of applications.
Undercarriage parts
The excavator undercarriage is the foundation that supports the entire machine, consisting of critical components such as track shoes, rollers, idlers, and sprockets that work together to provide traction, stability, and mobility. These durable parts are engineered to withstand the intense stresses and harsh operating conditions encountered during construction, demolition, and earthmoving tasks, and their proper maintenance and replacement are crucial for ensuring the excavator’s long-term performance and reliability. The undercarriage plays a vital role in the excavator’s overall capabilities, enabling it to traverse a wide range of terrains and job site conditions with confidence and efficiency.
Overview
The Cat® 303 CR Mini Excavator delivers power and performance in a compact size to help you work in a wide range of applications.
Engine
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 |
Weights
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 |
Blade
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 ° |
Sound
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 |
Sustainability
Recyclability | 95% |
Features
ALL DAY COMFORT
- 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.
EASY TO OPERATE
- 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.
STICK STEER TRAVEL MODE
- 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!
BIG PERFORMANCE IN A COMPACT DESIGN
- 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.
SAFETY ON THE JOB SITE
- 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.
SIMPLE SERVICE FOR LESS DOWNTIME
- 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.
LOWER OPERATING COSTS
- 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.
UNMATCHED DEALER SUPPORT
- 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.
SUSTAINABILITY
- 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)
Standard Equipment
ENGINE
- Cat C1.1 Turbo Engine (U.S. EPA Tier 4 Final/EU Stage V)
- Automatic Engine Idle
- Automatic Engine Shutdown
- Automatic Two Speed Travel
- Fuel Water Separator
- Power on Demand (not available in all regions)
- Variable Displacement Piston Pump
- Load Sensing/Flow Sharing Hydraulics
HYDRAULICS
- Smart Tech Electronic Pump
- Accumulator
- Automatic Swing Brake
- Auxiliary Hydraulic Lines
- One and Two Way Auxiliary Flow
- Continuous Auxiliary Flow
- Auxiliary Line Quick Disconnects
GUARDING
- Top Guard ISO 10262:1998 Level I
OPERATOR ENVIRONMENT
- Tilt-up Canopy or Tilt-Up Cab
- ROPS – ISO 12117-2:2008
- TOPS – ISO 12117:1997
- Next Generation Advanced Monitor
– Touch Screen
– Site Reference System
– High Definition Camera Capable (IP68 and IP69K)
– Numeric Security Code - Stick Steer Mode
- Travel Cruise Control
- Control Pattern Changer (optional in some regions)
- Adjustable Wrist Rests
- Washable Floor Mat
- Travel Pedals and Hand Levers
- Machine Security
- Machine Security – Standard Key with Pass Code
- Fabric Suspension Seat (Cab only)
- Vinyl Suspension Seat (Canopy only)
- Hydraulic Lockout – All Controls
- Retractable High Visibility Seat Belt (75 mm/3 in)
- Coat Hook
- Cup Holder
- Storage Pocket
- Skylight
- Mounting Bosses for Front
- Signaling/Warning Horn
- Interior Light (Cab only)
- Boom Light, Halogen
- Utility Space for Mobile Phone
- Next Generation Color LCD Monitor (IP66)
– Fuel Level and Coolant Temperature Gauges
– Maintenance and Machine Monitoring
– Performance and Machine Adjustments
– Numeric Security Code
– Multiple Languages
– Hour Meter with Wake Up Switch
– Jog Dial (cab only)
UNDERCARRIAGE
- Rubber Belt (300 mm/11.8 in wide)
- Dozer Blade
- Dozer Blade Float
- Tie Downs on Track Frame
BOOM, STICK AND LINKAGES
- One Piece Boom (2200 mm/86.6 in)
- Standard Stick (1260 mm/49.6 in)
- Front Shovel Capable – Hydraulic Coupler
- Front Shovel Capable – Pin-On
- Thumb Ready (not available in all regions)
- Certified Lifting Eye (optional in some regions)
ELECTRICAL
- 12 Volt Battery
- Software (machine and monitor)
- Maintenance Free Battery
- Signaling/Warning Horn
- 12 Volt Power Socket