New Holland 170 Shuts Down After Starting

[MikePhua]

A New Holland 170 skid steer exhibited an issue where the engine would start but immediately shut down once the key returned to the "run" position. This problem could be frustrating as it disrupts work and may indicate an underlying electrical or mechanical issue.
Possible Causes
Several potential reasons were identified for this issue, including:

1. Ignition Switch Problems: If the ignition switch is faulty or not properly connected, the machine may not remain in the "run" position after the key is turned, causing the engine to shut off.
   
2. Fuel Shutoff Solenoid: Many modern machines are equipped with a fuel shutoff solenoid that controls fuel flow to the engine. If this solenoid is malfunctioning or is not receiving power correctly, it could cut off the fuel supply when the key returns to the run position.
   
3. Wiring or Connection Issues: A loose or damaged wire, particularly around the ignition system or fuel system, could be causing intermittent loss of power or signal to the necessary components, resulting in the shutdown.
   
4. Safety Features: Some safety features like seat switches, pressure sensors, or hydraulic locks could be engaging improperly, causing the engine to shut down when the key returns to the run position.
   

Troubleshooting Process
The troubleshooting steps taken were as follows:

1. Ignition Switch Inspection: The ignition switch was tested for continuity and proper function. No issues were found with the switch itself, and it was determined to be functioning properly.
   
2. Fuel Shutoff Solenoid Check: The fuel solenoid was tested, and it was found that it was not receiving power after the key was turned back to the run position. This pointed to a potential issue with the solenoid's wiring or electrical connection.
   
3. Wiring Inspection: All relevant wiring around the ignition and fuel system was inspected for any signs of wear, corrosion, or disconnection. A loose connection in the wiring harness was found and corrected.
   
4. Safety Feature Examination: The safety switches, including the seat switch and pressure sensors, were checked. It was determined that none of these were malfunctioning and were not contributing to the shutdown issue.
   

Solution
The solution involved addressing the primary issue with the electrical wiring:

• Repairing Wiring Connections: The loose wire in the ignition system was fixed, restoring the proper flow of power to the fuel solenoid and other critical systems.
  
• Fuel Shutoff Solenoid Repair: The solenoid was cleaned and tested, ensuring that it operated correctly once the electrical connection was restored.
  

After these repairs, the skid steer started and ran normally without shutting down when the key returned to the "run" position.
Conclusion
In conclusion, the shutdown issue on the New Holland 170 was caused by a combination of faulty wiring and an issue with the fuel shutoff solenoid. By inspecting and repairing the ignition system wiring and ensuring the fuel solenoid was functioning correctly, the problem was resolved. Regular maintenance and wiring checks are recommended to prevent similar issues from arising in the future.