DW20S Excavator Issues and Solutions

[MikePhua]

The DW20S is a widely used excavator in the construction and digging industries. However, users have reported several common issues that affect its performance and operational efficiency. This article summarizes some of the reported problems with the DW20S, offering potential solutions to help operators increase the machine's lifespan and improve work efficiency.
Problem Description
The main issues reported by users include:

1. Engine Starting Difficulties: Many operators have found it difficult to start the DW20S, especially during cold starts, requiring multiple attempts before the engine starts.
   
2. Hydraulic System Failures: Hydraulic system issues lead to unstable operation, particularly during digging, lifting, or rotating, as the hydraulic power output is insufficient.
   
3. Fuel System Problems: When there is a failure in the fuel system, the machine’s working efficiency is greatly reduced, particularly after prolonged use when there is inadequate fuel supply or leakage.
   
4. Steering Issues: The steering system may become sticky, causing the excavator to respond poorly to steering commands, making operation difficult.
   

Possible Causes

1. Engine Starting Difficulties:
   • Low Battery Voltage: A low battery charge can be the root cause of starting issues, particularly in cold weather conditions.
     
   • Fuel Supply Issues: If the fuel system is clogged or the fuel filter is dirty, it can lead to difficulty starting the engine.
     
   • Low Coolant Temperature: If the coolant temperature is too low, the fuel may not be atomizing correctly, which can affect the startup process.
     
2. Hydraulic System Failures:
   • Poor Hydraulic Oil Quality: Low-quality or contaminated hydraulic oil may result in the system not operating smoothly and could lead to significant damage over time.
     
   • Hydraulic Pump Failure: A worn-out or faulty hydraulic pump may result in low pressure, which causes inadequate operation of the hydraulic system.
     
3. Fuel System Problems:
   • Clogged Fuel Filter: A dirty or blocked fuel filter can restrict the fuel flow, causing insufficient fuel supply to the engine, leading to poor performance.
     
   • Fuel Pump Failure: A malfunctioning fuel pump may result in inconsistent or low fuel pressure, affecting the overall operation of the engine.
     
4. Steering System Issues:
   • Low Steering Oil: If the steering system oil is low or if the pump fails, it can result in sticky or unresponsive steering.
     
   • Wear and Tear on Steering Components: Over time, the steering components may wear out, leading to a loss of responsiveness and difficulty controlling the machine.
     

Possible Solutions

1. Engine Starting Difficulties:
   • Check the Battery: Regularly check the battery voltage and ensure that the battery is in good condition. Replace it if necessary.
     
   • Replace the Fuel Filter: Regularly change the fuel filter to ensure the fuel supply remains clean and free from contaminants.
     
   • Check Coolant Temperature: Ensure the coolant temperature is within the recommended range to facilitate smooth engine startup.
     
2. Hydraulic System Failures:
   • Change Hydraulic Oil: Replace the hydraulic oil at regular intervals and use high-quality oil to maintain smooth system operation.
     
   • Inspect Hydraulic Pump: Check the hydraulic pump for any signs of wear or damage, and replace it if necessary to restore proper function.
     
3. Fuel System Problems:
   • Replace the Fuel Filter: Ensure that the fuel filter is replaced periodically to avoid clogs that hinder fuel flow.
     
   • Inspect the Fuel Pump: Check the fuel pump's pressure and flow rate. Replace it if it is malfunctioning.
     
4. Steering System Issues:
   • Check Steering Oil: Ensure that the steering oil is at the proper level to avoid poor or sticky steering.
     
   • Inspect Steering Components: Regularly check the steering components for wear and replace any damaged or worn parts to restore proper steering functionality.
     

Conclusion
The DW20S excavator, like any heavy equipment, can experience common issues over time. Regular maintenance and inspections of key systems, such as the hydraulic, fuel, and steering systems, can help reduce the frequency of these problems. Operators should stay proactive and address issues early, ensuring the longevity of the machine and its smooth operation. By following the recommended maintenance practices and addressing issues promptly, users can keep their DW20S excavator running efficiently and safely.