Troubleshooting Auxiliary Hydraulic Issues on the Case 1845C Skid Steer

[MikePhua]

Introduction
The Case 1845C skid steer loader, introduced in the early 1990s, has been a reliable workhorse in various industries, including construction and agriculture. One of its notable features is the auxiliary hydraulic system, designed to power attachments such as augers, breakers, and grapples. However, users have reported issues with the auxiliary hydraulics, particularly after modifications like the removal of the high-flow system. Understanding the system's design and common problems can aid in effective troubleshooting and repair.
System Overview
The auxiliary hydraulic system on the 1845C operates through an open-center hydraulic circuit. This means that hydraulic fluid continuously flows through the system, even when not in use, to maintain pressure and allow for quick response when needed. The loader's control valve directs this flow to various functions, including the auxiliary hydraulics.
Common Issues and Causes

1. Inadequate Return Path for Oil
   After removing the high-flow system, some users have reported that the auxiliary hydraulics fail to operate correctly. This issue often arises when the power beyond port, which was previously used to direct oil flow to the high-flow system, is not properly sealed or redirected. If the power beyond port is blocked without providing an alternative return path to the sump, hydraulic fluid cannot circulate properly, leading to malfunction.
   
2. Sticky Auxiliary Foot Pedal
   Another common problem is a sticky or partially depressed auxiliary foot pedal, which can rob oil from the lift circuit. This issue may result from debris or wear in the pedal mechanism, causing inconsistent hydraulic flow and affecting the performance of attachments.
   
3. Contamination and Air in the Hydraulic System
   Contaminants such as dirt or metal shavings can enter the hydraulic system, leading to clogged filters and valves. Additionally, air trapped in the lines can cause erratic operation or complete failure of the auxiliary hydraulics. Regular maintenance, including checking fluid levels, replacing filters, and bleeding the system, is essential to prevent these issues.
   

Troubleshooting Steps

1. Inspect the Power Beyond Port
   Ensure that the power beyond port is properly sealed or redirected. If the high-flow system has been removed, the port should be capped with a standard plug to allow oil to return to the sump. Failure to do so can impede oil flow and affect auxiliary hydraulic function.
   
2. Examine the Auxiliary Foot Pedal
   Check the auxiliary foot pedal for smooth operation. Clean any debris and lubricate moving parts as necessary. If the pedal is still sticky, inspect the linkage and springs for wear or damage.
   
3. Check for Contamination
   Inspect hydraulic filters and lines for signs of contamination. Replace any clogged filters and flush the system if necessary. Bleed the hydraulic system to remove trapped air, ensuring that fluid flows freely through all components.
   

Preventive Maintenance Tips

• Regularly Check Fluid Levels: Maintain the hydraulic fluid at the recommended level to ensure proper system operation.
  
• Replace Filters Periodically: Regularly replace hydraulic filters to prevent contamination and ensure clean fluid flow.
  
• Inspect Hoses and Fittings: Check hoses and fittings for leaks or signs of wear, and replace them as needed.
  
• Lubricate Moving Parts: Regularly lubricate moving parts, including the auxiliary foot pedal, to prevent sticking and wear.
  

Conclusion
The auxiliary hydraulic system on the Case 1845C skid steer is a valuable feature that enhances the machine's versatility. By understanding the system's design and common issues, operators can effectively troubleshoot and maintain the system, ensuring reliable performance of auxiliary attachments. Regular maintenance and prompt attention to problems can extend the life of the hydraulic system and improve overall machine productivity.