Volvo LM846 Tilt Ram Seal Replacement

[MikePhua]

Introduction to the Volvo LM846
The Volvo LM846 is a wheel loader model introduced in the late 1970s, known for its robust design and versatility in various construction and material handling applications. As with many machines of its era, the LM846 utilized hydraulic systems to operate key functions, including the tilt mechanism, which is crucial for bucket positioning and material handling.
Understanding the Tilt Ram and Its Seals
The tilt ram, or tilt cylinder, is a hydraulic actuator responsible for tilting the loader's bucket. It consists of a cylinder housing, piston, rod, and seals. The seals within the tilt ram prevent hydraulic fluid leaks and contamination, ensuring efficient operation. Over time, these seals can wear out due to factors like pressure fluctuations, contamination, and age, leading to performance issues such as slow or erratic bucket movement.
Common Seal Failures and Symptoms

• External Leaks: Visible hydraulic fluid around the cylinder rod or housing.
  
• Internal Leaks: Loss of pressure, resulting in slow or unresponsive bucket movement.
  
• Contamination: Dirt or debris entering the hydraulic system, causing wear on seals and other components.
  

Seal Replacement Process
Replacing the seals in the tilt ram involves several steps:

1. Preparation: Ensure the loader is on stable ground, and the hydraulic system is depressurized.
   
2. Removal: Detach the tilt cylinder from the loader frame and remove any associated components.
   
3. Disassembly: Carefully remove the cylinder rod from the housing, taking note of the orientation of all parts.
   
4. Inspection: Examine the cylinder for any signs of wear or damage that may require additional repairs.
   
5. Seal Replacement: Install new seals, ensuring they are correctly oriented and seated.
   
6. Reassembly: Reassemble the cylinder, ensuring all parts are correctly installed and torqued to specifications.
   
7. Testing: Reinstall the cylinder and test the hydraulic system for proper operation.
   

Selecting the Right Seal Kit
For the 1978 Volvo LM846, obtaining the correct seal kit is crucial. The original equipment manufacturer (OEM) part numbers may no longer be available, but aftermarket kits compatible with Volvo wheel loaders can be sourced. It's essential to verify the compatibility of the seal kit with the specific model and year of the loader to ensure proper fit and function.
Maintenance Tips

• Regularly inspect the tilt cylinder for signs of wear or leaks.
  
• Keep the hydraulic system clean and free from contaminants.
  
• Ensure the hydraulic fluid is at the correct level and in good condition.
  
• Replace seals at the first sign of wear to prevent further damage.
  

Conclusion
Maintaining the hydraulic system, particularly the tilt ram seals, is vital for the efficient operation of the Volvo LM846 loader. Regular inspections and timely seal replacements can extend the life of the equipment and prevent costly repairs. By understanding the components and processes involved, operators can ensure their machines remain in optimal working condition.