Troubleshooting Hydraulic Light Issues on New Holland LS170 Skid Steer

[MikePhua]

The New Holland LS170 skid steer loader is a versatile and powerful piece of equipment used in various industries such as construction, landscaping, and agriculture. Like all heavy machinery, maintaining the LS170's hydraulic system is crucial for ensuring optimal performance and preventing costly repairs. One common issue that operators may encounter is the illumination of the hydraulic warning lights on the instrument panel. These lights typically signal a potential problem within the hydraulic system, and it’s essential to diagnose the cause promptly.
Understanding the Hydraulic System in the LS170
The LS170 is powered by a robust hydraulic system that drives its lifting arms, bucket, and other attachments. Hydraulics are an integral part of the machine’s functionality, and the hydraulic warning lights are designed to alert operators to issues that could affect the performance or safety of the equipment. The system in the LS170 includes hydraulic pumps, hoses, valves, filters, and reservoirs—all of which must function properly to maintain performance.
The LS170 features a closed-loop hydraulic system, meaning the fluid circulates within the system, providing power to various components. If the hydraulic lights come on, it usually points to issues related to fluid pressure, fluid levels, or component malfunctions.
Common Causes of Hydraulic Warning Lights
When the hydraulic lights illuminate, several factors could be at play. Below are some of the most common reasons why the hydraulic lights may appear on the LS170.

1. Low Hydraulic Fluid Levels
   • One of the most common causes of the hydraulic warning light is low fluid levels in the hydraulic reservoir. This can occur due to a leak in the system or normal fluid consumption over time.
     
   • Low hydraulic fluid reduces the pressure within the system, causing the light to activate. Regularly checking the fluid levels and topping them off can prevent this issue.
     
2. Hydraulic Fluid Contamination
   • Contaminants such as dirt, water, or air can enter the hydraulic system, leading to degraded fluid quality. Contaminated fluid can cause the system to overheat, leading to potential damage.
     
   • The hydraulic fluid should be filtered regularly to prevent contamination, and in some cases, a full fluid change may be necessary.
     
3. Hydraulic Pump Failure
   • The hydraulic pump is responsible for circulating fluid throughout the system, and if it fails, the system will not generate the necessary pressure for lifting or operation.
     
   • A failed pump may be the result of age, wear and tear, or a lack of lubrication. It’s essential to monitor pump performance to avoid complete system failure.
     
4. Clogged Hydraulic Filters
   • The LS170 is equipped with filters designed to capture contaminants from the hydraulic fluid. If these filters become clogged, it can restrict the flow of fluid and reduce the system's pressure, causing the hydraulic light to turn on.
     
   • Regularly replacing or cleaning hydraulic filters is a simple maintenance task that can extend the life of the hydraulic system.
     
5. Faulty Pressure Relief Valve
   • The pressure relief valve is designed to protect the system from excessive pressure. If this valve malfunctions or gets stuck, it may cause the hydraulic system to over-pressurize or under-pressurize, triggering the warning lights.
     
   • A malfunctioning pressure relief valve needs to be repaired or replaced to restore proper system functionality.
     
6. Hydraulic Hose Leaks
   • Hydraulic hoses are vital for transporting fluid throughout the system. If one of these hoses leaks, it can lead to a drop in fluid pressure, which will activate the hydraulic warning light.
     
   • Regularly inspect all hydraulic hoses for signs of wear, cracks, or leaks. Replacing damaged hoses promptly can prevent further issues.
     

Diagnosing the Problem
When the hydraulic lights turn on in a New Holland LS170, it’s crucial to approach the issue systematically. Here are some steps to help diagnose and resolve the problem.

1. Check Fluid Levels:
   • The first step in diagnosing a hydraulic light issue is to check the hydraulic fluid level. Ensure the fluid is at the proper level as indicated in the operator’s manual. If the fluid is low, top it off and see if the light goes off after a few minutes of operation.
     
2. Inspect Hydraulic Hoses and Fittings:
   • Look for signs of fluid leakage around hoses, valves, and connections. Even small leaks can lead to significant pressure drops over time. If any hoses appear damaged, replace them immediately.
     
3. Examine the Hydraulic Filters:
   • A clogged hydraulic filter can often be the culprit. Check the filters and replace them if they are dirty or damaged. This is a simple and inexpensive fix that can resolve many issues.
     
4. Test the Hydraulic Pump:
   • If the fluid levels are correct and there are no visible leaks or blockages, the issue may lie with the hydraulic pump. A pump that is not functioning properly can cause low pressure, which activates the hydraulic warning light. Testing the pump pressure can confirm whether the pump is in good condition or needs to be replaced.
     
5. Check for Fluid Contamination:
   • If you suspect the fluid may be contaminated, consider having it tested or replacing it entirely. Contaminated fluid can cause significant damage to the pump, valves, and seals.
     
6. Inspect the Pressure Relief Valve:
   • If none of the previous steps have resolved the issue, the pressure relief valve could be at fault. Testing the valve and ensuring it is functioning properly can help rule out this potential cause.
     

Preventive Maintenance Tips
Preventing hydraulic system issues in the LS170 requires consistent maintenance and monitoring. Here are some tips to keep your skid steer’s hydraulic system running smoothly:

1. Regular Fluid Checks:
   • Regularly check the hydraulic fluid levels and quality. Low or dirty fluid can cause the system to malfunction, leading to costly repairs. Ensure that the fluid is clear and free of contaminants.
     
2. Filter Replacement:
   • Replace hydraulic filters according to the manufacturer’s recommendations. A clean filter ensures that debris and contaminants do not damage the hydraulic system.
     
3. Keep the System Clean:
   • During maintenance or repairs, always ensure that the system is clean. Dirt and debris can damage the system’s components, leading to more significant issues.
     
4. Inspect Hoses and Fittings:
   • Regularly inspect all hydraulic hoses and connections for leaks or damage. Promptly replace any damaged hoses to avoid pressure drops that can trigger warning lights.
     
5. Lubrication:
   • Regularly lubricate moving parts of the skid steer, especially the hydraulic pump, to reduce wear and tear. Well-lubricated components function more efficiently and are less prone to failure.
     

Conclusion
The hydraulic system of the New Holland LS170 is an essential component for its overall performance and efficiency. When hydraulic warning lights appear, it’s important to address the issue immediately to prevent further damage. By regularly checking fluid levels, inspecting for leaks, and replacing filters, operators can maintain the hydraulic system’s functionality and ensure that their skid steer remains in optimal working condition. Following a structured diagnostic approach and performing preventive maintenance can keep the LS170 running smoothly for years, avoiding costly repairs and downtime.