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Caterpillar 313CSR Excavator Detailed Overview
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Machine Background and History
The Caterpillar 313CSR is a compact radius hydraulic excavator designed for urban construction and utility work where space constraints require exceptional maneuverability without sacrificing power. The “CSR” designation stands for Compact Swing Radius, emphasizing minimal tail swing to operate efficiently near walls or tight barriers. Introduced as part of Cat’s 313 series, it combines durability and advanced hydraulic systems suitable for diverse digging, trenching, and material handling tasks.
Engine and Power
  • Powered by a Cat C3.6 diesel engine with turbocharging.
  • Produces approximately 108 to 110 horsepower with around 80.9 kW net power output.
  • The engine complies with modern emission standards while maintaining fuel efficiency and reliable torque delivery.
  • Features automatic engine speed control and a variable-speed fan to optimize cooling and reduce noise.
Operating Weight and Dimensions
  • Operating weight ranges near 13,500 to 14,100 kg (29,800 to 31,100 lbs) depending on configuration and attachments.
  • Compact design allows a tail swing radius of about 2.2 meters (7.3 ft), enabling operation in confined spaces.
  • Standard track gauge approximately 1990 mm (6.5 ft) ensures machine stability during operation.
  • Transport height close to 2.8 meters (9.1 ft), facilitating easy transport and access to sites.
Hydraulic System and Performance
  • The machine boasts a high flow, electronically controlled main hydraulic pump delivering approximately 247 liters per minute (65 gallons per minute).
  • Maximum system pressure reaches about 35,000 kPa (5,075 psi) on equipment functions, ensuring strong breakout and stick forces.
  • Bucket digging force is around 22,180 lbf (98.67 kN), while stick force is approximately 14,010 lbf (62.34 kN).
  • The excavator’s swing system provides smooth and precise motion with swing torque near 35 kN∙m (25,888 lbf-ft) and swing speed up to 11.5 rpm.
Boom, Stick, and Attachments
  • Offers boom length options around 4.65 m (15'3") and several stick length configurations (2.5 - 3.0 m or 8'2" to 9'10"), including thumb-ready sticks for enhanced gripping capability.
  • Bucket sizes vary typically between 0.53 m³ to 0.65 m³ (0.69 to 0.85 yd³), suited for different trenching and digging requirements.
  • Optional blades are available for grading and stabilization, with widths around 2.5 to 2.7 meters (8'2" to 8'10").
Operator Comfort and Safety
  • Features a ROPS-certified cab with mechanical suspension seats, sound suppression, and a 203 mm (8") touchscreen monitor for operational data.
  • Ergonomic controls and climate control options maximize operator productivity and comfort.
  • Optional safety features include a swing alarm and LED lighting packages for better visibility in low-light conditions.
  • The design emphasizes visibility, accessibility, and ease of maintenance features to reduce downtime.
Applications
  • Ideal for urban construction, landscaping, utility installations, and small to mid-size excavation projects.
  • Its compact swing radius and advanced hydraulics make it suitable for working alongside walls, fences, and in restricted areas without sacrificing power.
  • Efficient operation with attachments like hydraulic hammers, grapples, and augers enhances versatility.
Glossary of Terms
  • Compact Swing Radius (CSR): Design feature minimizing tail overhang for tight-site operations.
  • Breakout Force: The digging power the bucket exerts on material.
  • Stick Force: Force exerted by the excavator arm’s stick during operations.
  • ROPS: Roll-Over Protective Structure protecting operator safety.
  • Thumb-Ready Stick: A stick designed to attach a hydraulic thumb for gripping.
Conclusion
The Caterpillar 313CSR excavator represents a well-rounded machine offering powerful hydraulics, compact design, and operator-focused features suited for demanding and space-constrained environments. Its balance of strength and agility allows contractors and operators to maximize productivity across diverse applications from trenching to material handling. Modern safety, environmental, and ergonomic enhancements maintain Caterpillar’s legacy of durable and efficient machines.
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