Understanding the Daewoo 702 Plus Excavator

[MikePhua]

The Daewoo 702 Plus is part of Daewoo's series of crawler excavators designed for a variety of heavy-duty applications, including construction, mining, and earthmoving. Daewoo (now Doosan) has established itself as a major player in the construction equipment market, offering a wide range of machinery known for their reliability and durability. This article delves into the key features, specifications, and common troubleshooting aspects of the Daewoo 702 Plus excavator.
The Daewoo 702 Plus: Overview
The Daewoo 702 Plus is a mid-sized tracked excavator, built to handle medium-scale construction projects. This machine is designed for operators who need a combination of power, efficiency, and ease of maintenance. Known for its durability, the 702 Plus comes equipped with a variety of features intended to increase productivity and reduce downtime. It is typically used for digging, lifting, grading, and other tasks requiring significant hydraulic power.
Daewoo, which later became part of Doosan, first entered the heavy equipment market in the late 1990s. Over the years, the brand's machinery gained popularity due to its competitive pricing and performance. While Daewoo equipment, including the 702 Plus, may not have the same brand recognition as some of the industry giants like Caterpillar or Komatsu, it has developed a strong reputation in several global markets, especially for projects that require cost-effective solutions.
Key Features of the Daewoo 702 Plus
The Daewoo 702 Plus offers several features that make it a reliable and efficient choice for contractors and heavy equipment operators:

1. Engine Power: The 702 Plus is equipped with a diesel engine that delivers substantial power for demanding tasks. With a horsepower rating that sits comfortably in the mid-range for excavators, the machine is capable of handling a variety of tasks including digging, lifting, and grading.
   
2. Hydraulic System: One of the standout features of the Daewoo 702 Plus is its hydraulic system. The excavator is equipped with a powerful hydraulic pump that provides efficient power to the boom, arm, and bucket. This system ensures smooth operation even in challenging conditions.
   
3. Operator Comfort: Daewoo designed the 702 Plus with operator comfort in mind. The cab is spacious, offering a good view of the worksite, and features controls that are easy to operate, even for extended periods. The machine’s air conditioning and soundproofing systems also add to operator comfort.
   
4. Durability and Build Quality: As with most of Daewoo’s heavy equipment, the 702 Plus is designed to withstand tough working conditions. The track system is robust, and the machine is built to endure the rigors of rough terrain, heavy lifting, and high workloads.
   
5. Ease of Maintenance: Maintenance is simplified with easy access to major components. The hydraulic pumps, filters, and engine parts are all within easy reach for regular inspection, servicing, and repairs.
   
6. Undercarriage and Tracks: The 702 Plus features an advanced undercarriage system designed for superior stability and traction. This helps the machine navigate various types of terrain with ease, whether working in soft soils or on hard surfaces.
   

Technical Specifications
To understand the capabilities of the Daewoo 702 Plus, it's essential to look at its technical specifications. These specs include the machine's engine power, operating weight, and digging depth, all of which determine its performance in different applications.

• Engine Power: 150-170 horsepower (depending on specific model and configuration)
  
• Operating Weight: 20,000 – 23,000 kg (varies with configuration and attachments)
  
• Maximum Digging Depth: Around 6 meters (can vary based on bucket size and boom configuration)
  
• Bucket Capacity: 0.8 – 1.0 cubic meters
  
• Boom Reach: Approximately 9 meters, with variations depending on configuration.
  

These specifications make the Daewoo 702 Plus a solid contender in the mid-sized excavator category, ideal for a range of construction tasks where precision, power, and reliability are crucial.
Common Issues with the Daewoo 702 Plus
Like any piece of heavy machinery, the Daewoo 702 Plus can experience issues from time to time. Understanding these potential problems can help operators minimize downtime and repair costs. Some of the most common issues with the Daewoo 702 Plus include:

1. Hydraulic System Problems: Over time, the hydraulic system can experience wear and tear, leading to issues such as loss of power, jerky movements, or slow response times. Common causes include dirty hydraulic fluid, faulty pumps, or leaks in the hydraulic lines. Regular maintenance and checks are essential for preventing these issues.
   
2. Engine Performance Issues: Some owners have reported engine performance issues, such as rough idling or difficulty starting. These issues can often be traced back to problems with the fuel system, such as clogged fuel filters, dirty injectors, or low fuel pressure.
   
3. Track and Undercarriage Wear: The undercarriage system, while durable, can still suffer from excessive wear, especially in harsh environments. Regular inspection of the tracks, rollers, and idlers is necessary to ensure proper function. Failure to maintain the undercarriage can lead to increased repair costs and decreased performance.
   
4. Electrical System Failures: As with many modern excavators, electrical issues can sometimes arise, particularly with the machine’s sensors, wiring, and control systems. Problems with electrical components can lead to incorrect readings, system malfunctions, or a complete failure to start. Keeping the electrical system clean and ensuring regular inspections can help mitigate these issues.
   
5. Leaks and Seals: Over time, seals and gaskets may wear out, leading to fluid leaks. This is particularly true for hydraulic systems and engine components. Regularly checking for leaks and replacing worn seals can prevent fluid loss and further damage.
   

Maintenance Tips for the Daewoo 702 Plus
To extend the life of the Daewoo 702 Plus and keep it operating at peak performance, routine maintenance is essential. Some key maintenance practices include:

• Regular Oil Changes: Ensure the engine oil is changed at the recommended intervals. Using the correct oil type and grade is essential for engine longevity.
  
• Hydraulic Fluid Checks: Regularly inspect the hydraulic fluid levels and cleanliness. Contaminants in the hydraulic fluid can cause damage to pumps, valves, and other components.
  
• Track and Undercarriage Inspections: Check the tracks and undercarriage components for wear. Keep the tracks tensioned properly and lubricate components as needed.
  
• Air Filter and Fuel System Maintenance: Replace the air filters and clean the fuel system to prevent engine performance issues. Clogged filters and dirty injectors can lead to reduced efficiency and engine failures.
  
• Check for Leaks: Inspect the machine regularly for fluid leaks, especially in the hydraulic system. Address leaks promptly to prevent further damage.
  

Conclusion
The Daewoo 702 Plus excavator is a reliable, mid-sized machine that delivers solid performance for a variety of construction and earthmoving tasks. While it may not have the same global recognition as some larger brands, its durability, efficiency, and cost-effectiveness have made it a popular choice among contractors worldwide. By understanding its key features, troubleshooting common issues, and following proper maintenance practices, operators can ensure that the 702 Plus remains a powerful and dependable asset for years to come.