Troubleshooting Case 850B Turbo Track Loader Power Loss After Start

[MikePhua]

The Case 850B turbo track loader is a powerful and reliable piece of equipment commonly used in construction, landscaping, and earthmoving operations. Known for its strength and versatility, this model is often a key player on job sites where heavy lifting and maneuverability are essential. However, like any machine, it can experience mechanical issues. One such problem reported by operators is when the engine starts and runs well initially but begins to stumble and lose power after a minute or so.
This article delves into the potential causes of this issue, providing detailed troubleshooting steps and solutions to help operators get their Case 850B running smoothly again.
Understanding the Case 850B Turbo Track Loader
The Case 850B track loader is equipped with a turbocharged engine designed to deliver significant power for tough tasks. The turbocharging system increases the engine's efficiency by forcing more air into the combustion chamber, allowing for more fuel to burn and resulting in a boost in horsepower. While this makes the loader incredibly powerful, it also introduces complexity in the engine and fuel systems that can lead to specific issues if not properly maintained.
Common Causes of Power Loss in the Case 850B
When a Case 850B loader starts and runs but loses power after a brief period, it can often be attributed to one of several key issues. Below are some common culprits and their potential fixes:

1. Fuel System Problems
   One of the first things to check in power loss scenarios is the fuel system. Several issues can cause fuel starvation or improper fuel delivery, which can result in the engine stumbling or stalling.
   • Fuel Filter Clogging: Over time, fuel filters can become clogged with dirt and debris, restricting the flow of fuel to the engine. This can cause the engine to run fine initially but lose power as it struggles to get the proper fuel supply.
     
   • Fuel Line Obstruction: A blockage in the fuel lines can also impede fuel flow, leading to performance issues. This could be due to dirt, rust, or debris accumulating in the lines.
     
   • Fuel Pump Failure: A failing fuel pump may struggle to maintain proper fuel pressure, which can result in the engine losing power after a short time.
     
   Solution: Start by checking and replacing the fuel filter if necessary. Inspect the fuel lines for any visible damage or obstructions and replace any damaged sections. If the fuel pump is suspected, test its output and replace it if it's not providing the correct pressure.
   
2. Air Intake and Turbocharger Issues
   The turbocharger plays a critical role in increasing engine power by compressing air and forcing it into the combustion chamber. If there is an issue with the air intake or turbo system, it could cause the engine to run fine initially but lose power as the system warms up.
   • Dirty or Clogged Air Filter: A clogged air filter can restrict airflow to the engine, especially at higher operating speeds. When the filter is dirty, the turbo may not be able to supply the necessary air pressure, leading to power loss.
     
   • Turbocharger Failure: A malfunctioning turbocharger can fail to increase air pressure, leading to reduced engine efficiency. Common turbo issues include worn bearings or a malfunctioning wastegate.
     
   • Air Intake Leaks: Leaks in the air intake system can lead to a loss of pressure and reduced engine performance.
     
   Solution: Inspect the air filter and replace it if necessary. Check the turbocharger for signs of wear or damage, and ensure that all intake hoses and connections are tight and leak-free.
   
3. Fuel Injection Problems
   The fuel injectors in a turbocharged engine play a vital role in controlling the amount of fuel delivered to the combustion chamber. If the injectors are clogged or malfunctioning, the engine may not get the correct amount of fuel, leading to stumbling or power loss.
   • Clogged or Dirty Injectors: Over time, fuel injectors can become clogged with carbon deposits or other debris, leading to uneven fuel distribution.
     
   • Faulty Injector Pump: The injector pump controls the timing and amount of fuel injected into the engine. A malfunctioning pump can result in improper fuel delivery.
     
   Solution: Have the injectors tested and cleaned if necessary. If they are severely clogged, replacement may be required. Additionally, check the injector pump for proper operation.
   
4. Electrical and Sensor Malfunctions
   In modern equipment like the Case 850B, sensors and electrical systems play a key role in regulating engine performance. If a sensor malfunctions, it can send incorrect signals to the engine control unit (ECU), causing the engine to lose power.
   • Throttle Position Sensor (TPS) Issues: The TPS communicates the position of the throttle to the ECU. If it malfunctions, the engine may not receive the correct throttle input, leading to erratic performance.
     
   • Airflow or Pressure Sensors: These sensors monitor airflow and pressure in the intake and exhaust systems. If they malfunction, they can cause the engine to run poorly or lose power.
     
   Solution: Inspect the electrical wiring and sensors for any signs of wear or damage. Use a diagnostic tool to check for fault codes that could indicate sensor issues. Replace any faulty sensors as needed.
   
5. Exhaust System Blockage
   A blockage or restriction in the exhaust system can lead to increased back pressure, which can prevent the engine from operating efficiently. In turbocharged engines, this can cause a significant loss of power as the exhaust gases cannot exit the engine freely.
   • Clogged Diesel Particulate Filter (DPF): The DPF traps soot and particulate matter from the exhaust gases. Over time, it can become clogged, especially if the machine is frequently used in short, low-speed runs. This can result in excessive back pressure, causing the engine to stumble and lose power.
     
   Solution: Inspect the exhaust system for blockages and check the DPF for clogging. If the filter is clogged, it may need to be cleaned or replaced.
   

Steps for Diagnosing and Fixing the Issue
To properly diagnose the issue, follow these steps:

1. Start with the Fuel System: Check the fuel filter, fuel lines, and fuel pump for any issues. Replace or clean as necessary.
   
2. Inspect the Air Intake and Turbocharger: Replace the air filter and inspect the turbocharger for signs of damage. Ensure the air intake system is sealed and free of leaks.
   
3. Check the Fuel Injectors: Clean or replace the fuel injectors if necessary. Test the injector pump to ensure it’s functioning correctly.
   
4. Inspect Electrical Components: Use a diagnostic tool to check for any fault codes related to electrical or sensor issues. Repair or replace faulty components.
   
5. Examine the Exhaust System: Check for exhaust blockages, especially in the DPF. Clean or replace the DPF as necessary.
   

Preventive Maintenance for the Case 850B
Preventive maintenance is key to ensuring the longevity and reliability of your Case 850B. Regularly check and replace the fuel filters, air filters, and fluid levels. Inspect the turbocharger and exhaust system periodically to ensure optimal performance. Staying on top of these tasks will help prevent the power loss issues discussed and keep your loader running smoothly.
Conclusion
If your Case 850B turbo track loader starts strong but loses power shortly after, the issue is most likely related to the fuel system, air intake, or exhaust system. By following the troubleshooting steps outlined above, you can diagnose the root cause and implement the necessary repairs. Regular maintenance and early detection of potential problems will ensure that your Case 850B continues to operate efficiently and effectively for years to come.