Case 1845B with Tandem Injection Pump: Common Issues and Solutions

[MikePhua]

The Case 1845B is a compact yet powerful skid steer loader known for its ability to handle a wide variety of tasks, from material handling to digging and pushing. One of the key components that power this machine is the injection pump, which is responsible for delivering fuel to the engine at the correct timing and pressure. When issues arise with the Tandem Injection Pump, it can severely affect the machine’s performance, causing reduced power, rough idling, and even complete failure.
In this article, we’ll discuss common problems associated with the Tandem Injection Pump on the Case 1845B, how to diagnose them, and potential solutions to keep your skid steer loader running efficiently.
Understanding the Tandem Injection Pump
The Tandem Injection Pump is a critical component in the fuel system of many diesel engines, including the one found in the Case 1845B. It works by pressurizing the diesel fuel and then injecting it into the engine’s cylinders at precisely the right time to ensure optimal combustion. In some models, the Tandem design incorporates two pumps working in tandem to manage fuel delivery more efficiently.
Common Issues with the Tandem Injection Pump
1. Fuel Delivery Problems
One of the most common issues with the Tandem Injection Pump is insufficient fuel delivery. If the pump fails to deliver the proper amount of fuel to the engine, it can cause poor engine performance, resulting in sluggish acceleration, poor throttle response, and stalling.
Possible Causes:

• Worn or damaged fuel pump components: Over time, components such as the gears or valve lifters inside the pump may wear down, reducing fuel delivery.
  
• Clogged fuel lines or filters: If the fuel filters or lines become clogged, they can prevent proper fuel flow to the pump, causing delivery issues.
  
• Faulty fuel timing: The timing of the fuel delivery can be off if the pump is improperly calibrated, resulting in poor engine performance.
  

Solution:

• Check for fuel blockages: Inspect and replace fuel filters regularly, and ensure fuel lines are clear of debris.
  
• Pump inspection: A detailed inspection of the Tandem Injection Pump will identify any damaged internal components, which may need to be replaced.
  
• Calibrate the fuel pump: If fuel timing is off, recalibration of the pump may be necessary. Professional service or specialized tools may be required for this task.
  

2. Hard Starting or No Start
Another common issue is hard starting or the engine failing to start altogether. A malfunctioning Tandem Injection Pump can prevent the engine from receiving the proper amount of fuel during startup, leading to extended cranking times or complete failure to start.
Possible Causes:

• Fuel starvation: If the pump isn’t supplying enough fuel to the injectors, the engine will have difficulty starting.
  
• Faulty lift pump: In some systems, a lift pump supplies fuel to the injection pump. If this pump is faulty, it can lead to fuel supply problems at startup.
  
• Air in the fuel system: Air in the fuel lines or pump can cause cavitation, preventing proper fuel delivery to the engine.
  

Solution:

• Prime the fuel system: Ensure there is no air in the fuel system by bleeding the fuel lines. Follow the manufacturer’s instructions for proper priming procedures.
  
• Inspect the lift pump: If the lift pump is faulty, it may need to be replaced or repaired.
  
• Replace worn seals: Worn seals or gaskets can allow air to enter the system, so check the pump and fuel lines for any signs of leakage.
  

3. Poor Engine Performance (Rough Idling or Hesitation)
A malfunctioning Tandem Injection Pump can cause the engine to run roughly or hesitate when accelerating. This issue is often characterized by rough idling, inconsistent RPMs, or hesitation during throttle response.
Possible Causes:

• Leaking fuel injectors: If the injectors are leaking or not properly atomizing the fuel, it can result in rough engine performance.
  
• Wear in the injection pump: Over time, internal components in the injection pump can wear down, leading to inconsistent fuel delivery.
  
• Incorrect fuel pressure: If the fuel pressure is too high or too low, it can cause poor engine performance.
  

Solution:

• Inspect the fuel injectors: Clean or replace the fuel injectors if they are clogged or leaking.
  
• Inspect and repair the pump: If wear in the pump is causing inconsistent fuel delivery, the pump may need to be overhauled or replaced.
  
• Check the fuel pressure: Use a fuel pressure gauge to ensure the pressure is within the correct range.
  

Maintenance Tips for the Tandem Injection Pump
Proper maintenance is key to preventing issues with the Tandem Injection Pump. Below are a few tips to ensure long-term performance and avoid unexpected breakdowns.
1. Regular Fuel Filter Changes
A clogged fuel filter can lead to poor fuel delivery, putting extra strain on the injection pump. Replace the fuel filter regularly to prevent fuel system issues. Most experts recommend changing the fuel filter every 250-500 hours depending on usage and environmental conditions.
2. Use High-Quality Fuel
Poor-quality fuel can contain contaminants like water and dirt, which can damage the injection pump. Always use clean, high-quality diesel fuel to prevent contamination and extend the life of the injection system.
3. Check for Fuel Leaks
Regularly inspect the fuel lines, fuel tank, and injection pump for any signs of leakage. A small leak can cause the fuel system to lose pressure, resulting in poor engine performance.
4. Monitor Fuel Pressure
Ensure that the fuel pressure is within the proper range. Low or high fuel pressure can lead to poor engine performance and may indicate a problem with the Tandem Injection Pump or fuel system components.
Real-World Example: Troubleshooting a Case 1845B with a Tandem Injection Pump Issue
A contractor operating a Case 1845B skid steer noticed that the engine was experiencing hard starting issues. After performing routine maintenance, including checking the fuel filters and fuel lines, they discovered that the Tandem Injection Pump was not providing consistent fuel delivery. Upon further inspection, it was revealed that the lift pump was faulty, leading to poor fuel supply to the injection pump.
After replacing the lift pump and recalibrating the injection pump, the skid steer returned to normal performance, with improved starting, smoother idling, and better overall throttle response.
Conclusion: Maintaining Your Case 1845B's Tandem Injection Pump
The Tandem Injection Pump is a critical component in the Case 1845B skid steer loader’s fuel system. Regular maintenance, such as fuel filter replacements, proper fuel quality, and early diagnosis of fuel delivery issues, can prevent many of the common problems associated with this component. If problems do arise, diagnosing and repairing them promptly can save time and money, ensuring that your skid steer continues to perform at its best.
By staying on top of these maintenance tips and addressing issues as soon as they arise, operators can keep their Case 1845B running smoothly and efficiently for years to come.