Troubleshooting Intermittent Auxiliary Hydraulics on the CAT 247B

[MikePhua]

The CAT 247B is a popular skid steer loader in the construction and landscaping industries, known for its compact size and powerful performance. Like many machines in its class, the CAT 247B is equipped with auxiliary hydraulics to drive various attachments, such as augers, breakers, and grapples. However, when these hydraulics malfunction intermittently, it can cause significant downtime and reduce productivity.
In this article, we’ll discuss common issues that may cause intermittent problems with the auxiliary hydraulics on the CAT 247B, how to diagnose these issues, and provide solutions to ensure your equipment runs efficiently.
Understanding Auxiliary Hydraulics on the CAT 247B
Auxiliary hydraulics on the CAT 247B are designed to provide hydraulic power to attachments that require additional fluid pressure, such as rotating attachments or larger buckets. This system is controlled via a switch or joystick in the operator’s cab and is powered by the machine’s main hydraulic system.
The auxiliary hydraulic system operates through hoses, fittings, and valves that direct hydraulic fluid to the attachment. When the system is functioning correctly, the hydraulic fluid is directed with the proper pressure to the attachment, allowing the operator to use the machine for a variety of tasks. If there is an issue with this system, it could impact the machine’s performance, making it difficult to use certain attachments effectively.
Common Causes of Intermittent Auxiliary Hydraulics Failure
Intermittent problems with the auxiliary hydraulics on the CAT 247B are frustrating, as they can happen without warning and sometimes resolve on their own, only to reappear later. Below are some of the most common causes of these issues:

1. Faulty Hydraulic Control Valve or Solenoid
   The hydraulic control valve is a crucial component of the auxiliary hydraulic system. It directs hydraulic fluid from the pump to the appropriate attachment. If the valve or solenoid that controls it becomes faulty, the flow of hydraulic fluid can be inconsistent, leading to intermittent operation. A malfunctioning solenoid can cause the hydraulic system to turn on and off unexpectedly, or it may not activate at all.
   Solution: Inspect the solenoid and control valve for signs of wear or damage. Replace any worn components, and ensure the electrical connections are secure.
   
2. Hydraulic Pressure Relief Valve Issues
   The pressure relief valve regulates the amount of pressure in the hydraulic system. If this valve is malfunctioning, it can cause a drop in hydraulic pressure, leading to intermittent operation of the auxiliary hydraulics. This problem may be particularly noticeable under heavy load when the hydraulic system is called upon to operate at higher pressure.
   Solution: Check the pressure relief valve to ensure it's functioning correctly. If necessary, clean or replace the valve and recheck the system’s pressure.
   
3. Clogged or Leaking Hydraulic Hoses and Fittings
   Over time, hydraulic hoses and fittings can become clogged with dirt, debris, or internal wear debris. Even small leaks in the hoses or fittings can cause a drop in hydraulic fluid pressure, which can result in erratic performance or complete failure of the auxiliary hydraulics. This is especially problematic in older machines with worn-out hydraulic lines.
   Solution: Inspect all hoses and fittings for cracks, leaks, or blockages. If any hoses are damaged or worn, replace them immediately to restore proper fluid flow.
   
4. Insufficient Hydraulic Fluid
   Low hydraulic fluid levels can cause a range of issues with the auxiliary hydraulic system, including intermittent failure. If the fluid level is too low, the pump may not be able to supply enough pressure to the auxiliary hydraulics, causing it to function sporadically. Additionally, old or contaminated fluid can lead to performance issues.
   Solution: Regularly check the hydraulic fluid level and top up as necessary. Make sure to use the recommended fluid type and perform fluid changes at the intervals recommended by the manufacturer.
   
5. Electrical Issues
   Since the auxiliary hydraulics on the CAT 247B are electronically controlled, electrical issues such as a faulty switch, wiring problems, or a poor connection can cause intermittent operation. A malfunctioning control switch or loose wiring could prevent the system from activating or cause it to fail unexpectedly during operation.
   Solution: Inspect the wiring and electrical components, including the control switch and connections, for signs of wear or damage. Clean and secure any loose connections, and replace any faulty switches or relays.
   
6. Dirty or Worn Filters
   Hydraulic filters are responsible for trapping contaminants in the fluid before it reaches critical components like the pump, valves, and hoses. If the filter becomes clogged or contaminated, it can cause a reduction in hydraulic fluid flow, leading to intermittent hydraulic function.
   Solution: Replace or clean the hydraulic filter as part of regular maintenance. Ensure the filters are in good condition to avoid clogging and ensure smooth hydraulic operation.
   

Step-by-Step Diagnosis of Auxiliary Hydraulic Problems
When troubleshooting intermittent hydraulic problems, it’s essential to approach the issue systematically. Here’s a step-by-step process to help you diagnose and resolve issues with the auxiliary hydraulics:

1. Check the Hydraulic Fluid Level and Quality
   Start by ensuring that the hydraulic fluid is at the proper level and is in good condition. If the fluid is dirty or contaminated, change it and replace the filter. Make sure you are using the correct type of hydraulic fluid as specified by the manufacturer.
   
2. Test the Hydraulic Pressure
   Use a pressure gauge to test the hydraulic system’s pressure. Compare the reading to the manufacturer’s specifications. If the pressure is too low, it could indicate a problem with the pressure relief valve or the pump.
   
3. Inspect the Hydraulic Control Valve
   If the fluid level and pressure are fine, check the hydraulic control valve for any signs of malfunction. Test the solenoid and valve operation by activating the auxiliary hydraulics and monitoring for consistent performance. If the system is not responding correctly, the valve or solenoid may need to be replaced.
   
4. Examine Hoses and Fittings for Leaks or Damage
   Inspect all hoses and fittings leading to and from the auxiliary hydraulics for leaks or damage. Look for any cracks, abrasions, or signs of wear that could cause fluid loss or a reduction in pressure.
   
5. Inspect Electrical Connections
   Since the auxiliary hydraulics rely on electrical components, ensure that all wiring, relays, and switches are functioning correctly. Look for frayed wires, corrosion, or loose connections that could cause intermittent issues.
   
6. Test Attachments
   If the hydraulic system appears to be working fine, test the attachments being used with the auxiliary hydraulics. Some attachments may require higher flow rates or pressure than others, and using the wrong type of attachment could cause performance issues.
   

Real-World Example: Solving Hydraulic Coupler Problems
A contractor working with a CAT 247B on a large construction site experienced intermittent issues with their hydraulic coupler. The coupler, which was being used to operate a jackhammer, would suddenly lose power during operation, causing delays in the project.
After conducting a thorough inspection, the team discovered a leaking hydraulic hose near the coupler, which had been causing the intermittent drop in hydraulic pressure. Once the hose was replaced and the system was properly bled, the hydraulic coupler began functioning smoothly again, allowing the team to continue their work without further interruptions.
Conclusion: Preventing Intermittent Auxiliary Hydraulic Issues
Intermittent problems with the auxiliary hydraulics on the CAT 247B can be frustrating, but with the right troubleshooting steps, these issues can be resolved quickly and efficiently. Regular maintenance, including checking hydraulic fluid levels, inspecting hoses and fittings, and testing the hydraulic control system, will ensure that your machine remains in optimal condition and reduces downtime.
By staying on top of routine maintenance and addressing issues as soon as they arise, you can extend the life of your CAT 247B and keep your auxiliary hydraulics working smoothly for years to come. Whether you're using it for digging, lifting, or operating attachments, the CAT 247B is a powerful and versatile machine that can handle a variety of tasks—provided its hydraulic system is in top shape.