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The CAT 303.5 CR is a compact radius mini excavator engineered for tight-access excavation, utility trenching, and general construction. With upgraded hydraulics, refined operator controls, and a robust undercarriage, it offers a balance of maneuverability and digging force that suits both urban and rural job sites.
Development History and Market Position
Caterpillar introduced the 303.5 series in the early 2000s to meet growing demand for compact excavators that could perform full-scale digging in confined spaces. The CR designation stands for “Compact Radius,” indicating reduced tail swing for safer operation near walls, traffic, or landscaping. Over the years, the model has evolved through multiple updates, including improved engine emissions, enhanced cab ergonomics, and digital diagnostics.
The 303.5 CR is part of CAT’s mini excavator lineup ranging from 1 to 10 metric tons. It competes directly with models like the Kubota U35, Bobcat E35, and Takeuchi TB235. Caterpillar’s global sales of mini excavators exceeded 50,000 units annually by 2023, with the 303.5 CR consistently ranking among the top sellers in the 3.5-ton class.
Key Specifications and Performance Metrics
Operator Environment and Control Features
The 303.5 CR includes a sealed and pressurized cab option with heat and air conditioning, reducing dust intrusion and improving comfort. The joystick controls feature CAT’s Stick Steer system, allowing operators to switch between traditional travel levers and joystick-based movement. This reduces fatigue and improves control in tight areas.
Maintenance and Serviceability
Caterpillar designed the 303.5 CR with ground-level access to filters, fluid ports, and battery terminals. The tilt-up cab structure allows technicians to inspect hydraulic components without removing panels. Service intervals are tracked digitally, and the machine supports CAT’s Product Link telematics for remote monitoring.
The CAT 303.5 CR mini excavator is a compact powerhouse built for precision and productivity. Its refined hydraulics, operator-friendly controls, and durable frame make it a top choice for contractors who need versatility without sacrificing performance. Whether trenching in a backyard or clearing a utility corridor, the 303.5 CR delivers consistent results with minimal footprint.
Development History and Market Position
Caterpillar introduced the 303.5 series in the early 2000s to meet growing demand for compact excavators that could perform full-scale digging in confined spaces. The CR designation stands for “Compact Radius,” indicating reduced tail swing for safer operation near walls, traffic, or landscaping. Over the years, the model has evolved through multiple updates, including improved engine emissions, enhanced cab ergonomics, and digital diagnostics.
The 303.5 CR is part of CAT’s mini excavator lineup ranging from 1 to 10 metric tons. It competes directly with models like the Kubota U35, Bobcat E35, and Takeuchi TB235. Caterpillar’s global sales of mini excavators exceeded 50,000 units annually by 2023, with the 303.5 CR consistently ranking among the top sellers in the 3.5-ton class.
Key Specifications and Performance Metrics
- Operating Weight: 9,239 lb (4,190 kg)
- Net Power: 23.6 hp (17.6 kW) from a Cat C1.8 diesel engine
- Maximum Dig Depth: 122.4 in (3.11 m) with long stick
- Maximum Reach at Ground Level: 211.8 in (5.38 m)
- Bucket Digging Force: 5,742 lb (25.5 kN)
- Stick Digging Force: 4,114 lb (18.3 kN)
- Tail Swing Radius: 37.8 in (0.96 m) with counterweight
Operator Environment and Control Features
The 303.5 CR includes a sealed and pressurized cab option with heat and air conditioning, reducing dust intrusion and improving comfort. The joystick controls feature CAT’s Stick Steer system, allowing operators to switch between traditional travel levers and joystick-based movement. This reduces fatigue and improves control in tight areas.
- LCD monitor displays fuel level, engine hours, diagnostics, and maintenance alerts
- Adjustable seat and armrests support long operating shifts
- Auxiliary hydraulic lines are pre-plumbed for attachments like thumbs, augers, and compact hammers
Maintenance and Serviceability
Caterpillar designed the 303.5 CR with ground-level access to filters, fluid ports, and battery terminals. The tilt-up cab structure allows technicians to inspect hydraulic components without removing panels. Service intervals are tracked digitally, and the machine supports CAT’s Product Link telematics for remote monitoring.
- Engine oil change interval: 500 hours
- Hydraulic filter change: 1,000 hours
- Fuel tank capacity: 11.9 gallons (45 liters)
- Use long stick configuration for deeper trenching and better reach
- Install counterweight if lifting heavy loads or working on slopes
- Pair with CAT buckets and thumbs for optimal geometry and breakout force
- Monitor telematics data to schedule preventive maintenance and reduce downtime
- Train operators on Stick Steer mode to improve travel efficiency in confined zones
The CAT 303.5 CR mini excavator is a compact powerhouse built for precision and productivity. Its refined hydraulics, operator-friendly controls, and durable frame make it a top choice for contractors who need versatility without sacrificing performance. Whether trenching in a backyard or clearing a utility corridor, the 303.5 CR delivers consistent results with minimal footprint.
