Troubleshooting New Holland LS170 Skid Steer Starting Issues

[MikePhua]

Introduction
The New Holland LS170 is a widely used skid steer loader known for its reliability and versatility in various construction and agricultural applications. However, like any complex machinery, it can occasionally experience starting issues. One common problem reported by operators is the engine cranking but not starting, or starting only when the key is released from the start position. Understanding the underlying causes and potential solutions can help in efficiently diagnosing and resolving these issues.
Key Components Involved in the Starting Circuit
To effectively troubleshoot starting issues, it's essential to understand the key components involved in the LS170's starting circuit:

• Ignition Switch: Controls the flow of electrical power to various components, including the starter and fuel solenoid.
  
• Starter Relay: Acts as a switch to engage the starter motor when the ignition switch is in the start position.
  
• Fuel Solenoid: Regulates fuel flow to the engine; it must receive a constant voltage to remain open during cranking.
  
• Seat and Seatbelt Switches: Safety interlocks that prevent the engine from starting unless the operator is seated and the seatbelt is fastened.
  
• Service/Run Switch: Allows the operator to bypass certain safety interlocks for maintenance purposes.
  

Common Symptoms and Diagnostic Steps

1. Engine Cranks but Doesn't Start
   • Possible Causes:
     • Low voltage to the fuel solenoid during cranking.
       
     • Faulty starter relay or ignition switch.
       
     • Loose or corroded wiring connections.
       
   • Diagnostic Steps:
     • Measure the voltage at the fuel solenoid during cranking. A significant voltage drop (e.g., below 9V) indicates insufficient power.
       
     • Inspect and clean all battery terminals and ground connections.
       
     • Test the starter relay by swapping it with a known good relay.
       
     • Check the ignition switch for proper operation and continuity.
       
2. Engine Starts Only When Key is Released
   • Possible Causes:
     • Wiring issue between the ignition switch and the fuel solenoid.
       
     • Faulty service/run switch.
       
     • ECM (Electronic Control Module) malfunction.
       
   • Diagnostic Steps:
     • Inspect the wiring harness for any signs of wear, corrosion, or loose connections.
       
     • Test the service/run switch for proper operation.
       
     • If all else fails, consider testing or replacing the ECM.
       

Preventive Maintenance Tips

• Regularly Inspect and Clean Battery Terminals: Corrosion can impede electrical flow, leading to starting issues.
  
• Check and Tighten All Ground Connections: A poor ground connection can cause erratic electrical behavior.
  
• Test Safety Interlocks Periodically: Ensure that seat and seatbelt switches are functioning correctly.
  
• Use Quality Fuel and Maintain Fuel System: Contaminated fuel can lead to solenoid and injector problems.
  

Conclusion
Starting issues with the New Holland LS170 can stem from various electrical components and safety interlocks. By systematically diagnosing each potential cause and performing regular maintenance, operators can ensure reliable performance and minimize downtime. If problems persist despite troubleshooting efforts, consulting the operator's manual or seeking professional assistance may be necessary.