303.5 CR
303.5 CR - 2021, Tier 4 Final, Stage V, Global ex China, Japan
Overview
The Cat® 303.5 CR Mini Excavator delivers power and performance in a compact size to help you work in a wide range of applications.
Specifications
Units:
| Net Power | — |
| Operating Weight | — |
| Dig Depth | — |
Benefits & 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!
December 3, 2025
Specifications
Units:
| Net Power | — |
| Engine Model | C1.7 |
| Net Power @ 2,200 rpm - U.S. EPA Tier 4 Final/EU Stage V - ISO 9249/EEC 80/1269 | — |
| Net Power - ISO 9249 | — |
| Bore | — |
| Stroke | — |
| Displacement | — |
| Emissions | Meets U.S. EPA Tier 4 Final and EU Stage V emission standards. |
| Note | Advertised power is tested per the specified standard in effect at the time of manufacture. |
| Note (1) | Net power advertised is the power available at the flywheel when the engine is at the rated speed of 2,200 rpm and the engine is installed with the factory configured fan, air intake system, exhaust system and alternator with a minimum alternator load. |
| Operating Weight | — |
| Minimum Operating Weight with Canopy* | — |
| Maximum Operating Weight with Canopy** | — |
| Minimum Operating Weight with Cab* | — |
| Maximum Operating Weight with Cab** | — |
| EU: CE Plate Weight with Canopy*** | — |
| EU: CE Plate Weight with Cab*** | — |
| Note (1) | *Minimum Weight is based on fixed rubber tracks, operator, full fuel tank, standard stick, blade, no bucket and extra counterweight. |
| Note (2) | **Maximum Weight is based on steel tracks, operator, full fuel tank, long stick, blade, no bucket and extra counterweight. |
| 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. |
| Cab | — |
| Counterweight | — |
| Extra Counterweight | — |
| Long Stick | — |
| Steel Tracks | — |
| Angle Blade | — |
| Travel Speed - High | — |
| Travel Speed - Low | — |
| Maximum Traction Force - High Speed | — |
| Maximum Traction Force - Low Speed | — |
| Ground Pressure - Minimum Weight | — |
| Ground Pressure - Maximum Weight | — |
| Gradeability - Maximum | 30 degrees |
| Cooling System | — |
| Engine Oil | — |
| Fuel Tank | — |
| Hydraulic Tank | — |
| Hydraulic System | — |
| Type | Load Sensing Hydraulics with Variable Displacement Piston Pump |
| Pump Flow at 2,400 rpm | — |
| Operating Pressure - Equipment | — |
| Operating Pressure - Travel | — |
| Operating Pressure - Swing | — |
| Auxiliary Circuit - Primary - Flow | — |
| Auxiliary Circuit - Primary - Pressure | — |
| Auxiliary Circuit - Secondary - Flow | — |
| Auxiliary Circuit - Secondary - Pressure | — |
| Digging Force - Stick - Standard | — |
| Digging Force - Stick - Long | — |
| Digging Force - Bucket | — |
| Note | *Flow and pressure are not combinable. Under load, as flow rises pressure goes down. |
| Machine Swing Speed | — |
| Boom Swing - Left | — |
| Boom Swing - Right | — |
| Width | — |
| Height | — |
| Roll Over Protective Structure (ROPS) | ISO 12117-2:2008 |
| Tip Over Protective Structure (TOPS) | ISO 12117:1997 |
| Top Guard | ISO 10262:1998 (Level I) |
| Dig Depth | — |
| Vertical Wall | — |
| Maximum Reach - Ground Level | — |
| Maximum Reach | — |
| Maximum Dig Height | — |
| Maximum Dump Clearance | — |
| Boom In Reach | — |
| Tail Swing without Counterweight | — |
| Tail Swing with Extra Counterweight | — |
| Maximum Blade Depth | — |
| Maximum Blade Height | — |
| Boom Height - Shipping Position | — |
| O/A Shipping Height | — |
| Swing Bearing - Height | — |
| O/A Undercarriage Length | — |
| Overall Shipping Length* | — |
| Boom Swing - Right | — |
| Boom Swing - Left | — |
| Track Belt/Shoe Width | — |
| Minimum Ground Clearance Below Undercarriage | — |
| Stick Length | — |
| Note | *Overall Shipping Length depends on blade position during shipment. |
| Dig Depth | — |
| Vertical Wall | — |
| Maximum Reach - Ground Level | — |
| Maximum Reach | — |
| Maximum Dig Height | — |
| Maximum Dump Clearance | — |
| Boom In Reach | — |
| Tail Swing without Counterweight | — |
| Tail Swing - with Extra Counterweight | — |
| Maximum Blade Depth | — |
| Maximum Blade Height | — |
| Boom Height - Shipping Position | — |
| O/A Shipping Height | — |
| Swing Bearing - Height | — |
| O/A Undercarriage Length | — |
| Overall Shipping Length* | — |
| Boom Swing - Right | — |
| Boom Swing - Left | — |
| Track Belt/Shoe Width | — |
| Track Width | — |
| Minimum Ground Clearance Below Undercarriage | — |
| Stick Length | — |
| Note | *Overall Shipping Length depends on blade position during shipment. |
| Air Conditioning | The air conditioning system on this machine contains the fluorinated greenhouse gas refrigerant R134a or R1234yf (Europe) (Global Warming Potential = 1430). See label or instruction manual for gas refrigerant identification. The system contains 0.75 kg (1.65 lb), 0.90 kg (1.98 lb) or 1.0 kg (2.20 lb) of refrigerant which has a CO2 equivalent of 1.430 metric tonnes (1.576 tons) for R134a and 0.001 tonnes (0.001 tons) for R1234yf (Europe). |
| Operator Sound Pressure (ISO 6396:2008) | — |
| Average Exterior Sound Pressure (ISO 6395:2008) | — |
| Note | European Union Directive ‚ "2000/14/EC" |
| Recyclability | 95% |
Benefits & 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 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.
SUSTAINABILITY
- The Cat® C1.7 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)
- Cat Grade with advanced 2D and 3D technologies combine advanced guidance with optional automated machine control helping you reach grading targets while reducing fuel burn and greenhouse gas emissions by improving efficiency, job site productivity, and accuracy. (if equipped).
Data not available.
Standard Equipment
- ENGINE
- Cat C1.7 NA Engine (U.S. EPA Tier 4 Final/EU Stage V)
- Cat C1.7 NA Engine (U.S. EPA Tier 4 Final/EU Stage V)
- Automatic Engine Idle
- Automatic Engine Idle
- Automatic Engine Shutdown
- Automatic Engine Shutdown
- Automatic Two Speed Travel
- Automatic Two Speed Travel
- Fuel Water Separator
- Fuel Water Separator
- Power on Demand (not available in all regions)
- Power on Demand (not available in all regions)
- Variable Displacement Piston Pump
- Variable Displacement Piston Pump
- Load Sensing/Flow Sharing Hydraulics
- Load Sensing/Flow Sharing Hydraulics
- HYDRAULICS
- Smart Tech Electronic Pump
- Accumulator
- Smart Tech Electronic Pump
- Automatic Swing Brake
- Accumulator
- Auxiliary Line Quick Disconnects
- Automatic Swing Brake
- One and Two Way Auxiliary Flow
- Auxiliary Hydraulic Lines
- Continuous Auxiliary Flow
- One and Two Way Auxiliary Flow
- Auxiliary Hydraulic Lines
- Continuous Auxiliary Flow
- Auxiliary Line Quick Disconnects
- OPERATOR ENVIRONMENT
- Tilt-up Canopy or Tilt-Up Cab
- Stick Steer Mode
- Tilt-up Canopy or Tilt-Up Cab
- Travel Cruise Control
- Top Guard ISO 10262:1998 Level I
- Control Pattern Changer (optional in some regions)
- ROPS – ISO 12117-2:2008
- Adjustable Wrist Rests
- TOPS – ISO 12117:1997
- Washable Floor Mat
- Travel Pedals and Hand Levers
- Stick Steer Mode
- Machine Security
- Travel Cruise Control
- Machine Security – Standard Key with Pass Code
- Control Pattern Changer (optional in some regions)
- Fabric Suspension Seat (Cab only)
- Adjustable Wrist Rests
- Vinyl Suspension Seat (Canopy only)
- Washable Floor Mat
- Hydraulic Lockout – All Controls
- Travel Pedals and Hand Levers
- Retractable High Visibility Seat Belt (75 mm/3 in)
- Machine Security
- Coat Hook
- Machine Security – Standard Key with Pass Code
- Cup Holder
- Fabric Suspension Seat (Cab only)
- Storage Pocket
- Vinyl Suspension Seat (Canopy only)
- Skylight
- Hydraulic Lockout – All Controls
- Mounting Bosses for Front
- Retractable High Visibility Seat Belt (75 mm/3 in)
- Signaling/Warning Horn
- Coat Hook
- Interior Light (Cab only)
- Cup Holder
- Boom Light, Halogen (not available in all regions)
- Storage Pocket
- Utility Space for Mobile Phone
- Skylight
- Next Generation Color LCD Monitor (IP66)<br>– Fuel Level and Coolant Temperature Gauges<br>– Maintenance and Machine Monitoring<br>– Performance and Machine Adjustments<br>– Numeric Security Code<br>– Multiple Languages<br>– Hour Meter with Wake Up Switch<br>– Jog Dial (cab only)
- 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)<br> – Fuel Level and Coolant Temperature Gauges<br> – Maintenance and Machine Monitoring<br> – Performance and Machine Adjustments<br> – Numeric Security Code<br> – Multiple Languages<br> – Hour Meter with Wake Up Switch<br> – Jog Dial (cab only)<br><br>Next Generation Advanced Monitor (Optional)<br> – Fuel Level and Coolant Temperature Gauges<br> – Maintenance and Machine Monitoring<br> – Performance and Machine Adjustments<br> – Numeric Security Code<br> – Multiple Languages<br> – Hour Meter with Wake Up Switch
- UNDERCARRIAGE
- Rubber Belt (300 mm/11.8 in wide)
- Dozer Blade
- Dozer Blade Float
- Tie Downs on Track Frame
- Rubber Belt (300 mm/11.8 in wide)
- Dozer Blade
- Dozer Blade Float
- Angle Blade
- Tie Downs on Track Frame
- BOOM, STICK AND LINKAGES
- One Piece Boom (2400 mm/94.5 in)
- Standard Stick (1260 mm/49.6 in)
- Front Shovel Capable
- Front Shovel Capable – Pin-On
- Thumb Ready (not available in all regions)
- Certified Lifting Eye (optional in some regions)
- One Piece Boom (2400 mm/94.5 in)
- Standard Stick (1260 mm/49.6 in)
- Front Shovel Capable – Pin-On
- Thumb Ready (not available in all regions)
- Certified Lifting Eye (optional in some regions)
- GUARDING
- ROPS – ISO 12117-2:2008
- TOPS – ISO 12117:1997
- Top Guard ISO 10262:1998 (Level I)
- ELECTRICAL
- 12 Volt Battery
- Software (machine and monitor)
- Maintenance Free Battery
- Lock Out/Tag Out Battery Disconnect
- Signaling/Warning Horn
- 12 Volt Power Socket
- 12 Volt Battery
- Software (machine and monitor)
- Maintenance Free Battery
- Signaling/Warning Horn
- 12 Volt Power Socket
Optional Equipment
- OPERATOR ENVIRONMENT
- Cab with Air Conditioning
- Cab with Air Conditioning
- Cab with Heater
- Cab with Heater
- Control Pattern Changer (optional in some regions)
- Control Pattern Changer (optional in some regions)
- No Travel Pedals and Hand Levers
- No Travel Pedals and Hand Levers
- Machine Security – Push to Start with Key Fob/Pass Code
- Machine Security – Push to Start with Key Fob/Pass Code
- Vinyl Non-Suspension Seat (Canopy only)
- Vinyl Non-Suspension Seat (Canopy only)
- Seat Belt Reminder System
- LED Front Lights
- LED Front Lights
- LED Front and Rear Lights
- LED Front and Rear Lights
- LED Boom Light
- LED Boom Light
- Mirrors Left and Right
- Mirrors Left and Right
- Radio – Bluetooth®, Auxiliary, Microphone, USB (charging only) (Cab only)
- Radio – Bluetooth®, Auxiliary, Microphone, USB (charging only) (Cab only)
- Next Generation Advanced Monitor<br>– Touch Screen<br>– Site Reference System<br>– High Definition Camera Capable (IP68 and IP69K)<br>– Numeric Security Code
- UNDERCARRIAGE
- Steel Track (300 mm/11.8 in wide)
- Steel Track (300 mm/11.8 in wide)
- Angle Blade
- BOOM, STICK AND LINKAGES
- Long Stick (1560 mm/61.4 in)
- Long Stick (1560 mm/61.4 in)
- Front Shovel Capable – Dual Lock Manual Coupler
- Front Shovel Capable – Dual Lock Manual Coupler
- Attachments including Couplers, Thumbs, Buckets, Augers and Hammers
- Front Shovel Capable – Hydraulic Coupler
- 2nd Auxiliary Hydraulic Lines
- 2nd Auxiliary Hydraulic Lines
- Boom Lowering Check Valve
- Attachments including Couplers, Thumbs, Buckets, Augers and Hammers
- Stick Lowering Check Valve
- Boom Lowering Check Valve (Standard in Europe)
- Hydraulic Quick Coupler Lines (not available in all regions)
- Stick Lowering Check Valve (Standard in Europe)
- Hydraulic Quick Coupler Lines (not available in all regions)
- Front Shovel Capable – Hydraulic Coupler
- ELECTRICAL
- Battery Disconnect
- Product Link PL243 (regulations apply)
- Product Link PL243 (regulations apply)
- Product Link PLE643 (regulations apply)
- Product Link PLE643 (regulations apply)
- Travel Alarm (standard in some regions)
- Travel Alarm (standard in some regions)
- GUARDING
- Polycarbonate Half Height Front Guard (Canopy only)
- Polycarbonate Front Guard (ISO 10262:1998 Level I and EN356 P5A)
- Guard, Canopy
- Guard, Mesh
- OTHER
- Bio Oil Capable
- Eco Drain
- Water Jacket Heater
- Bio Oil Capable
- Light Counterweight (100 kg/221 lb)
- Eco Drain
- Extra Counterweight (250 kg/551 lb)
- Water Jacket Heater
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