Kubota SVL 90-2 Chugging and Skipping Issue: Troubleshooting and Solutions

[MikePhua]

Introduction: The Kubota SVL 90-2 Performance Problem
The Kubota SVL 90-2 is a powerful compact track loader commonly used in various construction and landscaping tasks. However, like all heavy equipment, it can experience issues that affect performance. One such issue reported by users is the "chugging" or "skipping" during operation, where the engine stutters or misfires intermittently. This can lead to reduced efficiency and could cause significant operational delays.
In this article, we will explore the possible causes of chugging and skipping in the Kubota SVL 90-2 and provide troubleshooting steps to resolve these issues.
1. Identifying the Symptoms of Chugging and Skipping
When experiencing chugging or skipping, operators of the Kubota SVL 90-2 may notice:

• Intermittent Engine Stuttering: The engine may lose power for a moment and then resume, which is often felt as a "chug" or "skip."
  
• Lack of Smooth Acceleration: The machine may have trouble maintaining a steady speed and might hesitate during acceleration.
  
• Power Loss Under Load: The engine may struggle when the loader is under load, causing noticeable power loss or hesitation.
  
• Increased Fuel Consumption: The engine might use more fuel than usual due to inefficient combustion.
  

These symptoms are typically a sign of an issue affecting the engine or fuel system, which requires prompt attention to prevent further damage.
2. Common Causes of Chugging and Skipping
Several factors can cause the chugging or skipping issue in the Kubota SVL 90-2. Here are some of the most likely culprits:

• Fuel Quality and Contamination: One of the primary reasons for engine hesitation is poor-quality fuel or contamination. Water, dirt, or debris in the fuel system can clog filters or injectors, affecting combustion.
  
• Clogged Fuel Filters: Fuel filters can become clogged over time due to dirt, rust, or debris in the fuel tank. A clogged filter restricts fuel flow, leading to poor engine performance and chugging.
  
• Dirty Fuel Injectors: The fuel injectors in the engine are responsible for delivering fuel in a fine spray. If the injectors become clogged or dirty, the fuel may not be atomized properly, leading to irregular combustion and skipping.
  
• Air in the Fuel System: If air has entered the fuel lines or fuel filter, it can disrupt the smooth flow of fuel to the engine, resulting in intermittent power loss and engine stuttering.
  
• Worn or Faulty Fuel Pump: A malfunctioning fuel pump may not provide enough pressure to deliver fuel properly, leading to skipping or stuttering as the engine struggles to maintain power.
  
• Faulty Spark Plugs: Misfiring or faulty spark plugs can cause irregular combustion, leading to engine skipping or chugging. This can also result in poor fuel efficiency and loss of power.
  
• Air Intake System Issues: Clogged or dirty air filters can restrict airflow to the engine, causing an imbalanced air-to-fuel ratio and resulting in engine skipping.
  

3. Troubleshooting Steps
To diagnose and fix the chugging and skipping issue on the Kubota SVL 90-2, follow these troubleshooting steps:

• Step 1: Inspect Fuel Quality and Tank: Check the fuel in the tank for contamination. Drain any old or suspect fuel and replace it with fresh fuel. Make sure the fuel tank is sealed and free from dirt or water.
  
• Step 2: Replace or Clean Fuel Filters: Inspect and replace the fuel filters if necessary. Clogged filters can impede fuel flow, leading to engine hesitation. It’s important to clean the fuel lines and ensure no debris is blocking the filter.
  
• Step 3: Clean or Replace Fuel Injectors: If you suspect the injectors are clogged, consider cleaning them with a fuel injector cleaner. In severe cases, the injectors may need to be replaced.
  
• Step 4: Bleed the Fuel System: If air has entered the fuel system, it must be bled out. Consult the operator’s manual for the correct procedure to purge air from the fuel lines and fuel filter.
  
• Step 5: Check the Fuel Pump: Verify that the fuel pump is working correctly and providing sufficient pressure. If the pump is faulty, it may need to be replaced to restore proper fuel delivery.
  
• Step 6: Inspect Spark Plugs: Check the spark plugs for signs of wear or fouling. Replace any faulty or worn plugs, as they can cause misfires and engine skipping.
  
• Step 7: Check the Air Filters: Ensure that the air filters are clean and not clogged. A dirty air filter can restrict airflow, leading to poor engine performance. Clean or replace the filter as needed.
  

4. Preventive Maintenance Tips
To avoid chugging and skipping issues in the future, it’s essential to perform regular maintenance:

• Regular Fuel and Filter Maintenance: Replace the fuel filters as per the manufacturer's recommended intervals. Also, ensure that the fuel is of good quality and free from contamination.
  
• Check Fuel System Components: Periodically inspect the fuel pump, injectors, and fuel lines for any signs of wear or damage. Regular inspection helps prevent fuel delivery issues.
  
• Spark Plug Maintenance: Replace spark plugs at the recommended intervals to avoid misfires. Check them regularly to ensure they are in good condition.
  
• Clean Air Filters: Ensure that the air filter is clean and free from dirt and debris. Replace it as needed to maintain optimal engine performance.
  

5. Conclusion
Chugging and skipping in the Kubota SVL 90-2 is typically caused by issues with the fuel system, air intake, or spark plugs. By following the troubleshooting steps outlined above and performing regular maintenance, operators can resolve the issue and keep their loader running smoothly.
If the problem persists after these steps, it is advisable to consult a professional mechanic or Kubota technician to diagnose and repair any underlying issues with the engine or fuel system.