Replacing Lift Arm Seals on a Case 1845C Skid Steer Loader

[MikePhua]

Introduction
The Case 1845C skid steer loader, introduced in the early 1990s, has been a workhorse in various industries due to its compact size and powerful performance. Over time, components such as the lift arm seals may wear out, leading to hydraulic fluid leaks and reduced lifting capacity. Replacing these seals is essential to maintain optimal machine performance.
Understanding the Lift Arm Seals
The lift arm seals are integral to the hydraulic cylinders that control the movement of the loader's lift arms. These seals prevent hydraulic fluid from leaking out and contaminants from entering the cylinder, ensuring smooth and efficient operation. Common symptoms of worn or damaged lift arm seals include visible hydraulic fluid leaks and sluggish or uneven lift arm movement.
Identifying the Correct Seal Kit
For the Case 1845C, several aftermarket seal kits are available. For instance, the 128725A1 seal kit is designed for the lift cylinders of models 1840, 1845, 1845B, and 1845C, featuring a 1-1/2" rod and 2-1/2" bore. It's crucial to verify the specific cylinder model and dimensions before purchasing a seal kit to ensure compatibility.
Tools and Safety Precautions
Before commencing the seal replacement, gather the following tools:

• Wrenches and socket set
  
• Pry bar or seal puller
  
• Torque wrench
  
• Clean rags and solvent for cleaning
  
• Safety gloves and goggles
  

Step-by-Step Seal Replacement Process

1. Preparation: Lower the lift arms and secure the loader on a flat surface. Disconnect the battery to prevent accidental operation.
   
2. Hydraulic Pressure Relief: Operate the lift arms to relieve any hydraulic pressure in the system. This step is crucial to prevent sudden movements during disassembly.
   
3. Remove Hydraulic Hoses: Using appropriate wrenches, disconnect the hydraulic hoses from the lift cylinder. Be prepared for residual hydraulic fluid to drain out.
   
4. Detach the Cylinder: Remove the retaining pins and snap rings securing the cylinder to the lift arm. Carefully slide the cylinder out of its mounting brackets.
   
5. Disassemble the Cylinder: Place the cylinder on a clean work surface. Using a seal puller or appropriate tool, remove the old seals from the cylinder components. Inspect all parts for wear or damage and clean thoroughly.
   
6. Install New Seals: Lubricate the new seals with clean hydraulic oil. Carefully install them into their respective grooves, ensuring they are seated properly to prevent leaks.
   
7. Reassemble the Cylinder: Reinstall the cylinder components in reverse order of disassembly. Ensure all parts are torqued to the manufacturer's specifications.
   
8. Reinstall the Cylinder: Position the cylinder back into its mounting brackets and secure it with the retaining pins and snap rings.
   
9. Reconnect Hydraulic Hoses: Attach the hydraulic hoses to the cylinder, ensuring all connections are tight to prevent leaks.
   
10. Test the System: Reconnect the battery and operate the lift arms through their full range of motion. Check for any signs of hydraulic fluid leaks and ensure smooth operation.
    

Maintenance Tips

• Regularly inspect the lift arm seals for signs of wear or damage.
  
• Keep the hydraulic system clean and free from contaminants.
  
• Use high-quality hydraulic fluid as recommended by the manufacturer.
  
• Address any hydraulic issues promptly to prevent further damage.
  

Conclusion
Replacing the lift arm seals on a Case 1845C skid steer loader is a manageable task with the right tools and procedures. Regular maintenance and timely seal replacement will ensure the longevity and reliability of the loader, minimizing downtime and repair costs.