Troubleshooting Persistent Drive Motor Issues on the Case 1845C Skid Steer

[MikePhua]

The Case 1845C is a well-regarded skid steer loader used in a variety of construction and agricultural tasks. However, like any piece of heavy machinery, it can develop issues over time. One of the common problems faced by owners of the Case 1845C is persistent issues with the drive motor. Even after replacing the drive motor, some operators have found that the same problems continue to occur. In this article, we will explore possible reasons why the new drive motor might not solve the issue, as well as troubleshooting steps to ensure proper operation.
Common Symptoms of Drive Motor Issues

1. Loss of Power to One or Both Wheels
   • One of the most noticeable symptoms of drive motor issues is a lack of power being delivered to one or both wheels. The skid steer may struggle to move or fail to respond as expected when the controls are engaged.
     
   • Cause: The drive motor may be malfunctioning or not receiving the proper hydraulic power. A blocked hydraulic line or a faulty valve could be restricting the flow of fluid to the motor, reducing its efficiency.
     
   • Solution: Check the hydraulic fluid levels and inspect the hydraulic lines for any blockages or leaks. If the fluid is low, top it up with the correct type of fluid. Ensure that all lines are clear and free from debris.
     
2. Erratic Movement or Loss of Control
   • Another common issue is erratic movement, where the skid steer lurches forward or backward unexpectedly, or fails to maintain a consistent speed.
     
   • Cause: This could be due to a malfunctioning drive motor or a problem with the hydraulic system that controls the motor. It may also be a result of a problem with the electronic controls or sensors that regulate the drive motor’s speed and response.
     
   • Solution: Inspect the hydraulic system for any signs of irregular pressure or flow. Check the motor’s electrical connections and sensors to ensure they are functioning properly. A diagnostic scan may reveal any issues with the electronic control system.
     
3. Overheating of the Drive Motor
   • Overheating of the drive motor can occur if the motor is not receiving enough hydraulic fluid or if the system is under too much strain.
     
   • Cause: The motor may be working harder than it should due to insufficient lubrication or incorrect hydraulic flow. Additionally, issues with the cooling system or overheating of the hydraulic fluid can lead to excessive heat buildup.
     
   • Solution: Ensure that the motor is properly lubricated and that hydraulic fluid is flowing correctly. Check the cooling system to ensure it is functioning and that the fluid is not overheating. Replace any damaged cooling components if necessary.
     

Possible Causes for Persistent Issues Despite New Drive Motor

1. Incorrect Installation of the New Motor
   • If the new drive motor was not installed correctly, it may not be aligned properly or could have internal damage due to improper fitting.
     
   • Cause: A new motor installed incorrectly or with insufficient care may not function as expected, even if it is a brand-new part.
     
   • Solution: Double-check the installation process. Verify that the new motor is properly aligned, connected, and securely mounted. Ensure that all bolts and fasteners are torqued to the manufacturer’s specifications.
     
2. Hydraulic System Imbalance
   • A major cause of repeated issues even after replacing the drive motor could be problems within the hydraulic system. A faulty valve, worn pump, or damaged hydraulic lines can reduce the efficiency of the motor, leading to similar symptoms.
     
   • Cause: If the hydraulic pump is not delivering consistent pressure or there is air in the system, it may cause erratic motor performance even with a new motor installed.
     
   • Solution: Check the entire hydraulic system for issues. Inspect the hydraulic pump and valves for any signs of wear or damage. Bleed the system to remove any trapped air and ensure proper fluid flow. You may also need to replace any worn hydraulic components to ensure reliable operation.
     
3. Improper Calibration or Control System Malfunction
   • The drive motor’s performance is also regulated by the skid steer’s electronic control system. If this system is malfunctioning or improperly calibrated, it can cause the motor to behave erratically, even if the motor itself is new.
     
   • Cause: Issues with the control system, such as faulty sensors, damaged wiring, or incorrect calibration, can lead to inconsistent or erratic performance of the new drive motor.
     
   • Solution: Use a diagnostic tool to check for any error codes or malfunctions in the control system. If the system is miscalibrated, it may need to be reset or recalibrated. Inspect the wiring and connections for any signs of damage or loose connections.
     
4. Fuel System Issues
   • The fuel system could be causing the drive motor issues, particularly if the machine is not getting the proper amount of power or fuel to run effectively.
     
   • Cause: A clogged fuel filter, bad fuel injectors, or a malfunctioning fuel pump could prevent the machine from operating at full capacity, leading to problems with the drive motor.
     
   • Solution: Check the fuel system for any blockages, leaks, or malfunctioning components. Replace the fuel filter if it’s clogged, and inspect the fuel lines for any damage. Ensure that the fuel pump is delivering the proper pressure to the system.
     

Step-by-Step Troubleshooting Process

1. Inspect the Hydraulic Fluid and System
   • Start by checking the hydraulic fluid level and ensuring that the fluid is clean and free from contaminants. Inspect the hydraulic lines and fittings for any signs of damage, leaks, or blockages.
     
2. Test the Drive Motor
   • Remove the motor and check for any visible signs of wear, misalignment, or internal damage. If possible, test the motor off the machine to ensure it is operating correctly.
     
3. Check the Electrical System
   • Inspect the wiring and sensors connected to the drive motor. Use a diagnostic tool to check for any errors or malfunctions in the control system that might be affecting motor performance.
     
4. Inspect the Hydraulic Pump and Valves
   • Test the hydraulic pump for consistent pressure and flow. Inspect the valves for any malfunctions or wear, and replace them if necessary.
     
5. Run the Skid Steer and Monitor Performance
   • After addressing any issues, run the skid steer and monitor the performance of the drive motor. Check for smooth and consistent operation, and ensure that the motor is delivering adequate power to the wheels.
     

Conclusion
Persistent drive motor issues on the Case 1845C skid steer, even after replacing the motor, can be frustrating. However, by systematically troubleshooting the hydraulic system, electrical components, and calibration settings, operators can identify the root cause of the problem. Common causes include hydraulic system imbalances, incorrect motor installation, fuel system issues, and control system malfunctions. By addressing these issues, owners can restore the drive motor’s functionality and ensure that the skid steer operates at optimal performance levels. Regular maintenance and careful inspection can help prevent similar issues in the future.