Used Original Doosan DH220LC-7 21-Ton Hydraulic Excavator

High Performance | Reliable Operation | Energy-Efficient Excavation

Introduction

The Used Original Doosan DH220LC-7 21-Ton Hydraulic Excavator is a medium-to-large scale construction machine, engineered for robust performance, durability, and fuel efficiency. With its high-output Doosan engine and advanced hydraulic system, the DH220LC-7 delivers exceptional digging power, smooth operational control, and consistent reliability across diverse construction applications.

From roadwork, mining, and foundation excavation to large-scale landscaping and material handling, this 21-ton hydraulic excavator offers a balanced combination of power, precision, and cost-effectiveness, making it a preferred choice for contractors and equipment rental companies worldwide.

This guide covers technical specifications, installation procedures, maintenance schedules, and performance features to help operators and buyers understand the capabilities and care requirements of this used Doosan model.

Specifications and Model Overview

The Doosan DH220LC-7 is designed for heavy-duty operations while maintaining operational efficiency and safety.

The DH220LC-7’s robust design ensures long service life, reduced downtime, and strong resale value in the used equipment market.

Structural and Technical Overview

1. Chassis and Undercarriage

• Heavy-duty X-frame structure provides stability and load-bearing capacity.

• Reinforced tracks and rollers designed for rough terrain durability.

• Low ground pressure minimizes soil disruption and ensures smooth travel on soft or uneven surfaces.

2. Boom and Arm

• High-strength steel construction for improved durability and fatigue resistance.

• Boom and arm geometry optimized for maximum digging force and reach efficiency.

• Welds are reinforced to reduce risk of structural failure in heavy-duty operations.

3. Hydraulic System

• Advanced variable displacement hydraulic pumps deliver precise, smooth power for digging, lifting, and swinging.

• Energy recovery technology reduces fuel consumption by utilizing return flow from cylinders.

• Independent control valves allow simultaneous multi-function operations without power loss.

4. Operator Cabin

• Spacious ROPS/FOPS-certified cabin with ergonomic seating, low vibration, and enhanced visibility.

• Digital display panel provides real-time monitoring of hydraulic pressure, engine health, fuel consumption, and maintenance reminders.

• Air-conditioning system maintains operator comfort in extreme weather conditions.

5. Electrical and Control System

• Waterproof and vibration-resistant wiring for stable, long-term operation.

• Centralized fuse box simplifies maintenance.

• Optional auxiliary hydraulic outlets for attachments like breakers, grapples, or augers.

Installation and Setup Procedures

Proper installation is crucial to ensure optimal performance and safety.

Step 1: Site Preparation

• Ensure the ground is level, stable, and free of obstacles.

• Check the site for underground utilities or soft soil areas.

Step 2: Unloading

• Use a flatbed or low-bed truck for transportation.

• Secure the excavator with chains and inspect for shipping damage before operation.

Step 3: Assembly

• Attach the boom, arm, and bucket if shipped disassembled.

• Connect hydraulic lines and check for proper sealing to avoid leaks.

• Install the operator cabin and ensure all control levers are responsive.

Step 4: System Checks

• Fill fuel, engine oil, and hydraulic fluid.

• Conduct a pre-start inspection: check undercarriage, hydraulic hoses, bolts, and safety alarms.

• Test all functions at low load before full-scale operation.

Step 5: Commissioning

• Start the engine and allow it to warm up for 5–10 minutes.

• Operate boom, arm, bucket, and swing to confirm smooth movement.

• Verify travel operation, braking, and emergency systems before starting production tasks.

Maintenance Schedule and Procedures

Regular maintenance ensures long-term performance and reduces the risk of unexpected failures.

Preventive Maintenance Tips

• Record all maintenance actions to maintain resale value and track component lifespan.

• Perform daily visual inspections for leaks, cracks, or loose bolts.

• Ensure hydraulic hoses are free from abrasion and connected securely.

Technical Indicators

The DH220LC-7 offers robust technical performance in multiple aspects:

1. Digging Performance

• Bucket breakout force: ~147 kN

• Arm digging force: ~108 kN

• Maximum digging depth: 7.0 m

2. Hydraulic System

• Maximum flow: 2 × 225 L/min

• System pressure: 34.3 MPa

• Energy recovery and multi-function operation supported

3. Mobility

• Maximum travel speed: 5.5 km/h (high), 3.2 km/h (low)

• Minimum turning radius: 3.2 m

• Gradeability: 35°

4. Fuel Efficiency

• Advanced variable displacement pumps reduce fuel consumption by ~15%

• Engine idle shutdown reduces unnecessary fuel use during downtime

5. Operational Comfort

• Ergonomic controls reduce operator fatigue

• Air-conditioned cabin and low-vibration design improve safety and efficiency

Energy and Environmental Compliance

• Meets Tier II/Tier III emission standards, reducing CO₂ and particulate output.

• Low-noise design for urban and residential work sites.

• Fuel-saving features include idle reduction and hydraulic power recovery.

Advantages of Choosing Used Original Doosan DH220LC-7

• Durable and Reliable: High-strength structure and proven Doosan hydraulics.

• Cost-Effective: Reduced purchase cost while maintaining high performance.

• Easy Maintenance: Accessible service points and long-lasting components.

• High Productivity: Powerful hydraulic system supports heavy lifting and continuous digging.

• Global Support: Genuine Doosan parts and certified service available worldwide.

Conclusion

The Used Original Doosan DH220LC-7 21-Ton Hydraulic Excavator offers exceptional performance, fuel efficiency, and structural durability for medium-to-large construction projects. Its advanced hydraulic system, ergonomic cabin, and strong digging force make it a reliable choice for contractors seeking high-performance, energy-efficient, and cost-effective used machinery.

With proper installation, adherence to maintenance schedules, and attention to technical specifications, the DH220LC-7 ensures long-term productivity, safety, and profitability, making it an ideal investment for construction companies and rental fleets.