Bobcat S185 Auxiliary Hydraulic Problem

[MikePhua]

Bobcat is well-known for its line of skid steer loaders, which are utilized in a wide range of construction, landscaping, and agricultural applications. One of the key features of Bobcat's equipment, including the S185 model, is its auxiliary hydraulic system. This system is designed to provide hydraulic power to attachments, enhancing the loader's versatility and performance. However, issues with the auxiliary hydraulics can lead to reduced efficiency, performance problems, and downtime. Understanding the common problems and troubleshooting steps related to the auxiliary hydraulic system of the Bobcat S185 is essential for operators and maintenance personnel.
Understanding the Auxiliary Hydraulic System in Bobcat S185
The Bobcat S185 is equipped with an auxiliary hydraulic system that powers attachments such as augers, breakers, and grapples. The auxiliary hydraulic system operates by directing hydraulic flow from the loader’s main hydraulic pump to the attachment. The S185's auxiliary hydraulics are controlled by a set of valves, which manage the flow of hydraulic fluid.
The system consists of several key components:

1. Hydraulic Pump: This pump is responsible for supplying hydraulic fluid under pressure.
   
2. Hydraulic Hoses: These hoses carry hydraulic fluid from the pump to the auxiliary port on the machine, and from there to the attachment.
   
3. Control Valves: The control valve directs the hydraulic fluid to the correct attachment, based on the operator’s input.
   
4. Auxiliary Ports: The ports are where the attachment is connected to the machine, allowing hydraulic fluid to flow through and power the attachment.
   
5. Pressure Relief Valve: This valve prevents over-pressurization by releasing excess hydraulic pressure.
   

The auxiliary hydraulic system is integral to the performance of various attachments and plays a significant role in the overall productivity of the Bobcat S185. Any issues in the system can lead to operational problems, such as a lack of power to attachments, slow or erratic movements, or even complete failure to operate.
Common Auxiliary Hydraulic Problems in Bobcat S185
When dealing with auxiliary hydraulic problems in the Bobcat S185, operators may experience one or more of the following issues:

1. No Hydraulic Flow to Attachments: One of the most common problems is when the operator notices that the attachment is not receiving any hydraulic power, resulting in a lack of functionality.
   
2. Slow or Erratic Attachment Movement: If the attachment operates slowly or inconsistently, it could be a sign of low hydraulic pressure, blockages, or valve issues.
   
3. Leaking Hydraulic Fluid: Leaking hoses or connections can result in reduced pressure and inefficient hydraulic power transmission, leading to poor performance.
   
4. No Response from Auxiliary Hydraulics: If the auxiliary hydraulics fail to respond to the operator’s input, it could indicate problems with the control valve, wiring, or the operator’s joystick.
   
5. Pressure Problems: Excessive or insufficient pressure can cause issues in the operation of attachments, including overheating, slow operation, and increased wear on the system.
   

Troubleshooting Auxiliary Hydraulic Problems
When faced with auxiliary hydraulic issues on the Bobcat S185, the following steps can be taken to diagnose and correct the problem:
1. Check Hydraulic Fluid Levels and Quality
Low or contaminated hydraulic fluid is one of the leading causes of auxiliary hydraulic problems. Insufficient fluid levels or dirty fluid can result in poor hydraulic pressure and inadequate flow to the attachments.

• Action: Inspect the hydraulic fluid reservoir to ensure it is filled to the correct level. If the fluid is dirty, drain and replace it with fresh, high-quality hydraulic fluid as recommended by Bobcat.
  

2. Inspect Hoses and Fittings for Leaks
Hydraulic leaks can lead to a drop in pressure, causing the auxiliary hydraulics to perform poorly. Check the hoses, fittings, and connections for any visible signs of leakage or wear.

• Action: Tighten loose fittings and replace any damaged or worn hoses. Pay close attention to the auxiliary port connections where the hydraulic hoses meet the attachments.
  

3. Test the Auxiliary Hydraulic Pressure
Low pressure can cause attachments to operate sluggishly or erratically. If the system is not producing enough hydraulic pressure, the attachments will not receive the full power needed for optimal performance.

• Action: Use a pressure gauge to measure the hydraulic pressure at the auxiliary ports. If the pressure is below the manufacturer’s recommended specifications, investigate further for issues with the pump, control valves, or pressure relief valves.
  

4. Inspect the Control Valve and Wiring
A malfunctioning control valve or issues with the wiring can prevent the hydraulic system from responding to the operator’s commands. This can result in a failure to power attachments or slow, jerky movements.

• Action: Check the control valve for blockages or signs of damage. Inspect the wiring and electrical connections between the joystick and the hydraulic valve to ensure that they are intact and free from corrosion.
  

5. Examine the Auxiliary Port Connections
Sometimes, the problem may lie with the attachment’s connection to the auxiliary ports. A poor connection can lead to inadequate hydraulic flow or even damage the hydraulic components.

• Action: Inspect the auxiliary port on the S185 to ensure a secure and proper connection to the attachment. Clean any dirt or debris that may have accumulated around the ports, as this can affect the hydraulic flow.
  

6. Verify the Pressure Relief Valve
The pressure relief valve protects the hydraulic system from over-pressurization, which can lead to system damage. If the valve is stuck open or malfunctioning, it could cause the hydraulic pressure to drop too low.

• Action: Test the pressure relief valve to ensure it is functioning correctly. If necessary, replace the valve if it is no longer providing the correct pressure regulation.
  

Preventive Maintenance for Auxiliary Hydraulics
To prevent auxiliary hydraulic problems from arising, it’s important to implement a regular maintenance routine. Some key preventive maintenance practices include:

• Regular Fluid Checks: Monitor hydraulic fluid levels regularly and ensure that the fluid remains clean and free from contaminants. Use the recommended fluid for your Bobcat S185 to ensure optimal performance.
  
• Periodic Inspections of Hoses and Fittings: Inspect all hydraulic hoses, fittings, and connections for signs of wear, leaks, or damage. Tighten or replace parts as necessary to prevent pressure loss.
  
• System Flushing: Every 1,000 hours or as recommended by Bobcat, flush the hydraulic system to remove any debris or contaminants that could impair the system’s performance.
  
• Operator Training: Proper operator training is essential to prevent unnecessary wear and tear on the hydraulic system. Operators should be trained to use the auxiliary hydraulics appropriately, avoiding sudden, jerky movements that can strain the system.
  

Conclusion
The auxiliary hydraulic system in the Bobcat S185 is a critical component that allows the machine to work with a variety of attachments, from augers to grapples. Problems with this system can lead to decreased productivity, increased downtime, and higher repair costs. By understanding the common issues that can arise, such as low hydraulic flow, leaks, and pressure problems, operators and maintenance personnel can take proactive steps to troubleshoot and repair the system. Regular inspections, proper fluid maintenance, and timely repairs are key to ensuring that the auxiliary hydraulics continue to perform at their best, maximizing the S185's capabilities and longevity.