New Holland LX985 Stuck in High Speed: Causes and Solutions

[MikePhua]

The New Holland LX985 is a versatile skid steer loader that is widely used in construction, agriculture, and other heavy industries for tasks such as lifting, digging, and material handling. However, like any complex machinery, it can experience operational issues that may disrupt productivity. One such issue is the loader getting stuck in high speed, which can be both puzzling and frustrating for operators. In this article, we’ll explore the potential causes behind the New Holland LX985 being stuck in high speed, the implications of this problem, and offer troubleshooting tips to resolve it.
Overview of the New Holland LX985 Skid Steer
The New Holland LX985 is part of the LX series of skid steer loaders, which are known for their durability, power, and versatility. These machines are equipped with high-performance engines and hydraulic systems that allow them to handle demanding tasks on job sites. The LX985 is powered by a 74-horsepower engine, capable of providing significant lifting and digging capabilities.
One of the key features of the LX985 is its hydrostatic drive system, which allows the operator to control the machine’s speed and direction seamlessly. This system is what allows the loader to accelerate smoothly and adjust speeds based on the workload. However, like all mechanical systems, this drive system can experience issues over time, leading to performance problems.
Understanding the Hydrostatic Drive System
Before diving into the potential causes of the "stuck in high speed" issue, it’s important to understand how the hydrostatic drive system works. The system uses a combination of hydraulic pumps and motors to transfer power from the engine to the wheels, allowing for precise control of speed and direction.
The hydrostatic drive system typically consists of the following components:

• Hydraulic pumps: These draw fluid from the reservoir and pressurize it to generate power for the drive motors.
  
• Drive motors: These receive pressurized hydraulic fluid from the pumps and convert it into mechanical movement to drive the wheels.
  
• Hydraulic fluid: The fluid serves as both a power medium and a lubricant, helping the system operate smoothly.
  
• Control valves: These valves regulate the flow of hydraulic fluid to the pumps and motors, controlling the speed of the machine.
  

The system allows for infinitely variable speed control, meaning the operator can adjust the loader's speed smoothly without the need for gears or shifting. However, when something goes wrong, the system may cause the loader to remain stuck in one gear, such as the high-speed setting, rendering the machine hard to control.
Common Causes for Getting Stuck in High Speed
Several issues can lead to a New Holland LX985 being stuck in high speed. The following are some of the most common causes:
1. Hydraulic System Problems
The most likely culprit when an LX985 loader is stuck in high speed is a malfunction within the hydraulic system. As mentioned earlier, the system relies on hydraulic fluid to operate the pumps and motors. If there is a loss of pressure or a blockage in the hydraulic system, the control valves may fail to respond correctly, causing the machine to remain stuck in high speed.
Common hydraulic-related issues include:

• Low hydraulic fluid: If the hydraulic fluid level is low, it can affect the pressure within the system, leading to erratic behavior in speed control.
  
• Contaminated hydraulic fluid: Dirt or debris in the hydraulic fluid can clog the system and cause poor performance. This may lead to inconsistent speed control or the machine becoming stuck in high speed.
  
• Worn-out hydraulic components: Over time, the hydraulic pump or motor may wear out, causing the system to malfunction and prevent the machine from slowing down.
  

Solution: Check the hydraulic fluid level and condition, ensuring there is no contamination. If the fluid is dirty or low, replace it with the manufacturer’s recommended fluid. Also, inspect the hydraulic hoses, pumps, and motors for any signs of wear or damage, and replace any faulty components.
2. Faulty Control Valve
The control valve in the hydrostatic drive system is responsible for regulating the flow of hydraulic fluid to the pumps and motors. If this valve becomes damaged or stuck, it can prevent the machine from adjusting its speed correctly, leaving it stuck in high speed.
Common causes of a faulty control valve include:

• Valve sticking: Over time, the valve may become sticky due to dirt or fluid contamination, preventing it from moving freely.
  
• Internal damage: The valve may suffer internal damage from excessive wear or fluid contamination, leading to malfunction.
  

Solution: Inspect the control valve for any signs of sticking or damage. If the valve is faulty, it will need to be cleaned or replaced. A hydraulic technician can test the valve's operation to ensure it is functioning properly.
3. Electrical System Issues
While less likely, electrical problems in the New Holland LX985 could also be responsible for the high-speed issue. The machine's hydrostatic drive system is controlled by electronic components that regulate the speed. If there is an electrical failure or short circuit, it could cause the system to default to high speed.
Solution: Check the fuses, wiring, and connectors associated with the speed control system. Ensure there is no damage to the electrical system and that all connections are secure. In some cases, an ECU (electronic control unit) reset or replacement may be required.
4. Issues with the Transmission System
The transmission system in the LX985 works in conjunction with the hydraulic system to manage the machine’s speed. If there is a malfunction in the transmission, such as a problem with the drive belt or an internal failure, it could cause the machine to become stuck in one speed mode.
Solution: Inspect the transmission for any issues, including leaks, worn-out components, or broken parts. If necessary, replace or repair the affected parts of the transmission system to restore normal operation.
Troubleshooting Tips and Preventive Measures
To prevent the "stuck in high speed" issue from occurring again, regular maintenance and troubleshooting are essential. Here are some tips to help keep your New Holland LX985 operating smoothly:

• Regularly check hydraulic fluid levels and replace fluid at recommended intervals.
  
• Inspect hydraulic filters to ensure they are not clogged with contaminants, which can impair system performance.
  
• Monitor the electrical system for any signs of issues, and ensure that all wiring and connections are secure.
  
• Perform routine inspections of the control valve and other key components of the hydrostatic drive system to ensure they are functioning properly.
  
• Follow the manufacturer's maintenance schedule to keep the machine in peak operating condition.
  

Conclusion
Getting stuck in high speed can be a serious issue for New Holland LX985 operators, but understanding the causes and solutions can help mitigate this problem. Whether it’s a hydraulic failure, a faulty control valve, electrical issues, or a problem with the transmission, prompt identification and maintenance can restore your loader’s performance and keep your projects on track. Regular inspections and adherence to the recommended maintenance schedule are key to preventing these issues from arising in the future, ensuring that the LX985 continues to be a reliable and efficient machine.