50 T large excavator

Definition of a 50 T Large Excavator

A 50 T large excavator is a heavy-duty earthmoving machine designed for high-output mining, quarrying, and infrastructure engineering. It features a robust hydraulic system, reinforced boom structure, and high digging force suitable for continuous high-load cycles in industrial operations.

Technical Parameters and Specifications

• Operating Weight: 48,500–52,000 kg

• Engine Power: 260–320 kW (ISO 9249)

• Bucket Capacity: 2.2–3.2 m³ (rock/earthmoving options)

• Maximum Digging Depth: 7,000–7,500 mm

• Maximum Reach at Ground Level: 10,800–11,200 mm

• Maximum Digging Force: 250–290 kN

• Hydraulic System Pressure: 32–36 MPa

• Travel Speed: 3.0–5.0 km/h

• Fuel Tank: 650–750 L

• Undercarriage Width: 3,300–3,900 mm (extendable)

Structural and Material Composition

Main Structural Modules

• Upper Frame: Welded high-strength low-alloy steel, designed for torsion resistance.

• Boom and Arm: Reinforced plates (yield strength 690 MPa) with multi-layer robotic welding.

• Hydraulic System: Variable-displacement axial-piston pumps with load-sensing control.

• Undercarriage: X-frame structure with hardened track links and sealed rollers.

• Cab: ROPS/FOPS certified, laminated glass, integrated operator assist systems.

• Powertrain: Turbocharged diesel engine with high-pressure common-rail fuel system.

Manufacturing Process

Engineering Workflow

1. 1. Material Preparation: Cutting high-strength plates using laser/plasma cutting systems.

2. 2. Structural Welding: Robotic welding stations ensure joint strength and uniformity.

3. 3. Machining: CNC machining centers produce precise boom seat, swing bearing housing, and hydraulic interfaces.

4. 4. Surface Treatment: Shot blasting, primer coating (anti-corrosive), and polyurethane painting.

5. 5. Powertrain Integration: Engine, pumps, motors, and valves calibrated to ISO testing standards.

6. 6. Hydraulic System Assembly: High-pressure hoses and valves undergo leak and burst tests.

7. 7. Final Testing: Load tests, digging cycle simulation, and electronic system calibration.

Industry Comparison

Application Scenarios

• EPC Contractors: Infrastructure excavation, dam base preparation, tunneling support works.

• Mining Companies: Overburden removal, loading into 40–60 T dump trucks.

• Quarry Operators: Rock extraction and material handling.

• Demolition Firms: High-reach demolition when equipped with extended boom.

• Rental Providers: Long-cycle projects requiring high productivity.

Core Pain Points and Solutions

• High Fuel Consumption: Use load-sensing hydraulics and eco-mode to reduce unproductive throttle time.

• Component Wear in Harsh Conditions: Apply reinforced bucket teeth, abrasion-resistant liners, and scheduled lubrication.

• Hydraulic Overheating: Install high-capacity oil coolers and ensure proper pump calibration.

• Unstable Operation on Soft Ground: Use wider track shoes and ground pressure redistribution mats.

• Downtime due to Electronic Faults: Implement fault-code monitoring and field diagnostics tools.

Risk Warnings and Mitigation Recommendations

• Hydraulic Burst Risk: Only use hoses rated for 36 MPa and replace every 2,000–3,000 hours.

• Undercarriage Fatigue: Avoid continuous high-speed travel on rocky surfaces.

• Roll-over Hazard: Maintain slope working angles below 35% grade.

• Engine Overload: Keep engine loading below 90% during continuous mining cycles.

Procurement and Selection Guide

1. Define application requirements: mining, foundation excavation, quarrying, or demolition.

2. Check compliance with emission standards (Tier 3/Tier 4/Stage V).

3. Evaluate hydraulic pump brand, displacement rate, and system pressure rating.

4. Assess undercarriage structural thickness and track durability.

5. Verify material strength (minimum yield strength ≥ 520 MPa for key structures).

6. Inspect cab protection level (ROPS/FOPS) and operator assist technologies.

7. Compare real fuel consumption under standard test cycles.

8. Check availability of spare parts and maintenance interval requirements.

Engineering Case Example

In a 950,000 m³ earthmoving project for a highway expansion, six 50 T large excavators operated in a 24-hour rotation. Each unit achieved an average productivity of 780–920 m³/day, loading 45 T dump trucks in 3–4 cycles. High-strength booms reduced fatigue cracks, and load-sensing hydraulics lowered fuel use by 12% compared to the contractor’s previous fleet.

FAQ

1. What is the ideal bucket size? 2.2–3.2 m³ depending on material density.

2. How long is the maintenance cycle? 250 hours for standard service; 2,000 hours for major checks.

3. Can a 50 T excavator be used for demolition? Yes, with a high-reach boom and breaker attachment.

4. What is the typical lifespan? 10,000–18,000 working hours under standard operation.

5. What fuel does it use? Ultra-low sulfur diesel (ULSD).

6. Is transportation difficult? Requires low-bed trailer with ≥ 60 T capacity.

7. What ground pressure does it require? Typically 65–75 kPa.

8. Does it support GPS grade control? Yes, most models support 2D/3D machine guidance.

9. What attachment compatibility is recommended? Breaker, ripper, crusher, and heavy rock bucket.

10. Can it operate in extreme temperatures? Yes, with arctic or tropical hydraulic oil options.

Request Quotation / Technical Documents / Engineering Samples

To obtain a detailed quotation, technical drawings, operational cycle data, or sample engineering configurations for a 50 T large excavator, please contact our technical sales team to receive customized specifications based on your project requirements.

E-E-A-T Author Credentials

This article is authored by a senior heavy-equipment technical consultant with over 15 years of experience in earthmoving machinery design, mining project operation planning, and large-excavator performance optimization for EPC contractors and industrial users.