Troubleshooting a New Holland LS185B Skid Steer That Won't Start

[MikePhua]

The New Holland LS185B is a popular skid steer loader used in a variety of construction and agricultural tasks. However, like any piece of heavy equipment, it can occasionally experience issues, such as failing to start. When the LS185B won't start, it's crucial to systematically troubleshoot the problem to identify and resolve the underlying issue. In this article, we’ll walk through the potential causes of a no-start situation and offer solutions for getting your machine back in action.
Common Causes for a New Holland LS185B Not Starting

1. Battery Issues
   • One of the most common reasons for a no-start condition in any vehicle, including skid steers, is a dead or weak battery. If the battery doesn’t have enough charge, the engine won’t start.
     
   • Cause: A discharged or faulty battery, corroded terminals, or loose connections can prevent the machine from starting.
     
   • Solution: Start by checking the battery voltage with a multimeter. If the voltage is low (below 12.4V), recharge or replace the battery. Clean any corrosion from the terminals and tighten any loose connections to ensure proper power flow.
     
2. Fuel System Problems
   • Fuel-related issues can also prevent the LS185B from starting. Problems such as a clogged fuel filter, air in the fuel lines, or an empty fuel tank can all contribute to a no-start condition.
     
   • Cause: Blockages in the fuel filter, fuel lines, or a malfunctioning fuel pump can restrict fuel flow to the engine.
     
   • Solution: First, check the fuel level to ensure there is enough fuel in the tank. Inspect the fuel filter for any blockages or dirt, and replace it if necessary. Bleed the fuel system to remove any air pockets that may have formed in the lines. Ensure that the fuel pump is functioning and providing adequate pressure.
     
3. Ignition System Failure
   • If the ignition system is not functioning properly, the engine will fail to start. This can be caused by a faulty starter motor, ignition switch, or related components.
     
   • Cause: A malfunctioning starter motor, ignition relay, or blown fuse can prevent the starter from engaging properly.
     
   • Solution: Test the starter motor by checking for voltage at the starter terminal when turning the ignition key. If there’s no voltage, check the ignition switch, fuses, and relays. Replace any faulty parts as needed.
     
4. Safety Switches and Interlocks
   • The LS185B is equipped with various safety switches and interlock systems that prevent the machine from starting if certain conditions aren’t met, such as the seat being occupied or the transmission being in neutral.
     
   • Cause: A malfunctioning safety switch or interlock system can prevent the machine from starting, even if there are no mechanical issues.
     
   • Solution: Check that all safety interlocks are functioning properly. Verify that the seat switch is working, and that the machine is in neutral or park. Inspect the seat sensor and other safety switches for any faults.
     
5. Wiring and Electrical Connections
   • Loose or corroded wiring connections can prevent the flow of electricity to critical components, causing the machine not to start.
     
   • Cause: Poor electrical connections or damaged wiring can interfere with the starting system.
     
   • Solution: Inspect all wiring and connectors related to the starting system. Look for any visible signs of wear, corrosion, or loose connections. Clean and tighten connections as needed, and replace any damaged wires or connectors.
     
6. Faulty Engine Control Module (ECM)
   • The ECM controls various engine functions, including the start-up process. If the ECM malfunctions or fails, it may prevent the engine from starting.
     
   • Cause: A damaged or malfunctioning ECM can cause the engine to fail to start by not sending the proper signals to the ignition or fuel systems.
     
   • Solution: Check for any diagnostic trouble codes (DTCs) using a scan tool to see if the ECM is reporting any issues. If necessary, have the ECM tested and replaced by a professional.
     

Step-by-Step Troubleshooting Process

1. Check the Battery
   • Verify the battery’s charge and inspect for corrosion or loose connections. Clean the terminals and tighten any loose connections. If the battery voltage is low, recharge or replace it.
     
2. Inspect the Fuel System
   • Ensure there is enough fuel in the tank and check the fuel filter for clogs or dirt. Bleed the fuel system to remove any air pockets and ensure that the fuel pump is operating correctly.
     
3. Test the Ignition System
   • Check the starter motor for proper operation. Verify that there is voltage at the starter when the ignition is turned on. Inspect the ignition switch, fuses, and relays for any faults and replace any defective components.
     
4. Inspect Safety Switches
   • Ensure that all safety switches are functioning correctly. Verify that the machine is in neutral, the seat switch is engaged, and other interlock systems are working properly.
     
5. Examine Wiring and Electrical Connections
   • Inspect all wiring and connectors related to the starting system. Tighten or clean any loose or corroded connections and replace any damaged wires.
     
6. Check the ECM
   • Use a diagnostic scanner to check for any trouble codes related to the engine control module. If the ECM is faulty, it may need to be repaired or replaced.
     

Conclusion
When a New Holland LS185B won’t start, the problem can usually be traced back to one of several common causes, such as a dead battery, fuel system issues, ignition system failure, or electrical problems. By following a systematic troubleshooting process, operators can identify and resolve the issue efficiently. Regular maintenance, including checking the battery, fuel system, and safety switches, can help prevent future starting problems and ensure that your skid steer continues to perform reliably on the job site. If these basic checks don’t resolve the issue, further investigation into the ECM or other electrical systems may be required, in which case consulting a professional technician is recommended.