8 hours ago
The Bobcat 751 skid-steer loader is a popular piece of heavy equipment known for its versatility and compact design, making it ideal for a range of tasks including digging, lifting, and material handling. One of the key features of the Bobcat 751 is its auxiliary hydraulic system, which allows operators to power a variety of attachments such as augers, breakers, and grapple buckets. However, like any hydraulic system, the auxiliary hydraulics can experience issues that prevent the machine from performing optimally. This article provides a detailed guide to troubleshooting auxiliary hydraulic problems in the Bobcat 751, including potential causes, solutions, and tips for maintaining system efficiency.
Understanding the Bobcat 751 Auxiliary Hydraulic System
Before diving into troubleshooting, it's important to understand how the auxiliary hydraulic system works on the Bobcat 751. The system is designed to provide power to attachments by using the machine’s engine-driven hydraulic pump. The pump sends hydraulic fluid through hoses to the attachment, allowing it to operate.
The Bobcat 751 is equipped with both standard and high-flow auxiliary hydraulic circuits, depending on the model and configuration. The standard auxiliary system is ideal for light-duty attachments, while the high-flow system is capable of powering larger, more demanding attachments like hydraulic breakers or trenchers.
Common Issues with Bobcat 751 Auxiliary Hydraulics
When troubleshooting auxiliary hydraulic problems on the Bobcat 751, there are several common issues to consider. These include low hydraulic pressure, lack of flow, and system leaks. Here are some of the most frequent causes:
Here are step-by-step instructions for troubleshooting common auxiliary hydraulic issues on the Bobcat 751:
Preventing auxiliary hydraulic problems is always better than fixing them. Regular maintenance can extend the life of the system and reduce the likelihood of costly repairs. Here are a few maintenance tips to keep your Bobcat 751 auxiliary hydraulics in top condition:
The auxiliary hydraulic system on the Bobcat 751 is a crucial component for powering a variety of attachments. While issues such as low hydraulic pressure, leaks, and faulty control valves can cause the system to malfunction, understanding the root causes and knowing how to troubleshoot them can help you restore functionality quickly. Regular maintenance and prompt attention to any issues will help ensure that your Bobcat 751 continues to perform at its best, allowing you to get the job done efficiently.
Understanding the Bobcat 751 Auxiliary Hydraulic System
Before diving into troubleshooting, it's important to understand how the auxiliary hydraulic system works on the Bobcat 751. The system is designed to provide power to attachments by using the machine’s engine-driven hydraulic pump. The pump sends hydraulic fluid through hoses to the attachment, allowing it to operate.
The Bobcat 751 is equipped with both standard and high-flow auxiliary hydraulic circuits, depending on the model and configuration. The standard auxiliary system is ideal for light-duty attachments, while the high-flow system is capable of powering larger, more demanding attachments like hydraulic breakers or trenchers.
Common Issues with Bobcat 751 Auxiliary Hydraulics
When troubleshooting auxiliary hydraulic problems on the Bobcat 751, there are several common issues to consider. These include low hydraulic pressure, lack of flow, and system leaks. Here are some of the most frequent causes:
- Low Hydraulic Pressure or Flow
If the auxiliary hydraulics on the Bobcat 751 are not providing sufficient pressure or flow to the attachment, the performance of the attachment will be greatly diminished. This issue can be caused by several factors:- Clogged Hydraulic Filters: The hydraulic system relies on clean hydraulic fluid to operate efficiently. If the filters are clogged or dirty, fluid may not flow properly, resulting in low pressure or flow to the auxiliary circuits.
- Low Hydraulic Fluid Levels: Insufficient hydraulic fluid can lead to a lack of pressure in the system. Always check the hydraulic fluid reservoir and top up the fluid as needed.
- Faulty Hydraulic Pump: A malfunctioning hydraulic pump may not be able to generate enough pressure to operate the auxiliary hydraulics. This could be due to internal damage or wear, requiring the pump to be repaired or replaced.
- Clogged Hydraulic Filters: The hydraulic system relies on clean hydraulic fluid to operate efficiently. If the filters are clogged or dirty, fluid may not flow properly, resulting in low pressure or flow to the auxiliary circuits.
- Leaks in the Hydraulic System
Hydraulic fluid leaks are another common issue that can prevent the auxiliary hydraulics from working effectively. Leaks can occur at various points in the hydraulic system, such as the hoses, fittings, or the valve block. Leaks lead to a loss of pressure and fluid, reducing the system's performance. Identifying and repairing leaks as soon as possible is crucial to maintaining the health of the system.
- Auxiliary Control Valve Problems
The auxiliary hydraulic system on the Bobcat 751 is controlled by an auxiliary valve that directs hydraulic fluid to the attachments. If the valve is stuck, damaged, or clogged, it may prevent the hydraulic fluid from reaching the attachment, leading to a loss of function. In such cases, the valve will need to be inspected and repaired or replaced as necessary.
- Incorrect Attachment Connection
When using attachments, it’s important to ensure that they are properly connected to the auxiliary hydraulic system. Improper connections, such as incorrect hose fittings or unsealed connections, can lead to a loss of hydraulic power. This problem is often easy to identify by inspecting the attachment and the hydraulic hoses for any loose or missing connections.
- Incorrect Flow Settings
The Bobcat 751 has a flow control system that adjusts the hydraulic flow rate for different attachments. If the flow setting is incorrect or has been accidentally changed, it may prevent the attachment from working properly. Ensuring the correct flow rate is set for each attachment is essential for optimal performance.
Here are step-by-step instructions for troubleshooting common auxiliary hydraulic issues on the Bobcat 751:
- Check Hydraulic Fluid Levels:
- Start by checking the hydraulic fluid reservoir to ensure it is at the proper level. Low fluid levels can cause the system to underperform. If necessary, top up the fluid using the manufacturer-recommended hydraulic fluid.
- Start by checking the hydraulic fluid reservoir to ensure it is at the proper level. Low fluid levels can cause the system to underperform. If necessary, top up the fluid using the manufacturer-recommended hydraulic fluid.
- Inspect Hydraulic Filters:
- Inspect the hydraulic filters for signs of clogging or contamination. If the filters are dirty or clogged, replace them to restore proper fluid flow.
- Inspect the hydraulic filters for signs of clogging or contamination. If the filters are dirty or clogged, replace them to restore proper fluid flow.
- Check for Leaks:
- Inspect all hoses, fittings, and connections for signs of hydraulic fluid leakage. Even a small leak can lead to significant issues. Tighten or replace any damaged components to prevent further leaks.
- Inspect all hoses, fittings, and connections for signs of hydraulic fluid leakage. Even a small leak can lead to significant issues. Tighten or replace any damaged components to prevent further leaks.
- Test the Hydraulic Pump:
- If the auxiliary hydraulics are still not working properly, the hydraulic pump may be the issue. Check the pump for any signs of damage or wear. If the pump is malfunctioning, it will need to be repaired or replaced.
- If the auxiliary hydraulics are still not working properly, the hydraulic pump may be the issue. Check the pump for any signs of damage or wear. If the pump is malfunctioning, it will need to be repaired or replaced.
- Inspect the Auxiliary Control Valve:
- Check the auxiliary control valve for proper operation. If the valve is stuck, clogged, or malfunctioning, it may prevent the hydraulic fluid from reaching the attachment. Clean, repair, or replace the valve as necessary.
- Check the auxiliary control valve for proper operation. If the valve is stuck, clogged, or malfunctioning, it may prevent the hydraulic fluid from reaching the attachment. Clean, repair, or replace the valve as necessary.
- Verify Attachment Connections:
- Ensure that the attachment is properly connected to the auxiliary hydraulic lines. Check for any loose or missing fittings, and ensure the hoses are securely attached.
- Ensure that the attachment is properly connected to the auxiliary hydraulic lines. Check for any loose or missing fittings, and ensure the hoses are securely attached.
- Check Flow Settings:
- Review the flow settings for the attachment to make sure they are correct. Adjust the flow rate if necessary to match the requirements of the attachment being used.
- Review the flow settings for the attachment to make sure they are correct. Adjust the flow rate if necessary to match the requirements of the attachment being used.
Preventing auxiliary hydraulic problems is always better than fixing them. Regular maintenance can extend the life of the system and reduce the likelihood of costly repairs. Here are a few maintenance tips to keep your Bobcat 751 auxiliary hydraulics in top condition:
- Regularly Replace Hydraulic Filters:
- To ensure clean hydraulic fluid, replace the hydraulic filters on a regular basis as recommended by the manufacturer. Dirty filters can cause wear and tear on the hydraulic system.
- To ensure clean hydraulic fluid, replace the hydraulic filters on a regular basis as recommended by the manufacturer. Dirty filters can cause wear and tear on the hydraulic system.
- Monitor Hydraulic Fluid Levels:
- Keep an eye on the hydraulic fluid levels and top up the fluid whenever necessary. Check for signs of leaks and repair them promptly.
- Keep an eye on the hydraulic fluid levels and top up the fluid whenever necessary. Check for signs of leaks and repair them promptly.
- Inspect Hoses and Fittings:
- Routinely inspect the hydraulic hoses and fittings for wear, damage, or leaks. Replace any hoses or fittings that show signs of wear before they cause a more serious problem.
- Routinely inspect the hydraulic hoses and fittings for wear, damage, or leaks. Replace any hoses or fittings that show signs of wear before they cause a more serious problem.
- Test the Hydraulic System Regularly:
- Conduct regular tests to ensure that the hydraulic system is functioning properly. Check the auxiliary hydraulic pressure and flow to make sure the system is performing at peak efficiency.
- Conduct regular tests to ensure that the hydraulic system is functioning properly. Check the auxiliary hydraulic pressure and flow to make sure the system is performing at peak efficiency.
The auxiliary hydraulic system on the Bobcat 751 is a crucial component for powering a variety of attachments. While issues such as low hydraulic pressure, leaks, and faulty control valves can cause the system to malfunction, understanding the root causes and knowing how to troubleshoot them can help you restore functionality quickly. Regular maintenance and prompt attention to any issues will help ensure that your Bobcat 751 continues to perform at its best, allowing you to get the job done efficiently.
