Choosing the Right Swing Gear Lubricant for the Kobelco SK135SRLC-1E

[MikePhua]

The Kobelco SK135SRLC-1E is a popular model of excavators, known for its reliability, fuel efficiency, and advanced technology. As with any heavy machinery, regular maintenance is crucial to ensuring the longevity and efficient performance of the equipment. One area that often requires attention is the swing gear mechanism. This system, which allows the excavator’s upper structure to rotate relative to the undercarriage, relies heavily on proper lubrication to avoid excessive wear, overheating, and ultimately costly breakdowns.
In this article, we will explore the importance of swing gear lubrication for the Kobelco SK135SRLC-1E, the right lubricant to use, and maintenance tips to keep the machine running smoothly.
What Is Swing Gear and Why Does It Need Special Lubrication?
The swing gear is a key component in any excavator, enabling the machine's upper structure to rotate 360 degrees while maintaining stability and balance. This rotational capability is crucial for a wide range of applications, from digging to loading. The gear is exposed to significant pressure and friction during operation, making it highly susceptible to wear if not adequately lubricated.
Lubricating the swing gear is necessary for the following reasons:

1. Reduce Friction: The swing gear experiences constant friction as it rotates, which can lead to metal-to-metal contact without proper lubrication. This increases wear on the components, shortening their lifespan and increasing maintenance costs.
   
2. Prevent Overheating: Friction generates heat, which can cause damage to internal parts of the swing gear. Proper lubrication ensures heat dissipation, preventing overheating and maintaining smooth operation.
   
3. Extend Gear Life: Using the right lubricant helps protect the gears, seals, and bearings, preventing premature failure. Regular maintenance of the lubrication system ensures the gears operate at optimal efficiency over time.
   
4. Improve Efficiency: Proper lubrication reduces the load on the engine, decreasing fuel consumption and improving the overall efficiency of the machine.
   

Choosing the Right Swing Gear Lubricant for the Kobelco SK135SRLC-1E
The manufacturer’s recommendations for lubrication play a crucial role in ensuring the performance and longevity of the swing gear. Kobelco specifies a certain type of lubricant for its SK135SRLC-1E model, taking into account the operating conditions and the specific requirements of the swing system.

1. Kobelco-Specific Lubricants: Kobelco often recommends using their proprietary lubricants, which are formulated specifically for their equipment. For the SK135SRLC-1E, Kobelco suggests using a high-quality gear oil that provides adequate protection against wear and ensures smooth operation of the swing mechanism.
   
2. Viscosity and Temperature Range: The viscosity of the lubricant is a crucial factor in determining its suitability for different temperatures and operational conditions. High-viscosity lubricants are recommended for colder climates, while lower viscosity oils may be better for warmer environments. Be sure to check the equipment's manual for the right viscosity grade to match local climate conditions and operating temperatures.
   
3. Additives for Extreme Pressure: Swing gears are subjected to extreme pressure, particularly during heavy lifting and rough terrain operations. Choosing a lubricant that contains extreme-pressure (EP) additives can help ensure that the gears remain protected, even under high-stress conditions.
   
4. Synthetic vs. Mineral Oil: Many modern machines, including the Kobelco SK135SRLC-1E, can benefit from synthetic lubricants, which offer enhanced performance in extreme conditions. Synthetic oils tend to have better thermal stability, which reduces the chances of overheating. However, mineral oils are still commonly used and can be more affordable while still providing adequate protection under normal operating conditions.
   

How to Check and Change Swing Gear Lubricant
Maintaining the correct lubricant level and quality is an ongoing process in the care of an excavator. Regular inspections and timely changes help prevent issues that could lead to mechanical failures or reduced performance.

1. Inspect Lubricant Levels: Regularly check the swing gear lubrication level by using the machine's dipstick or inspection ports. Low lubricant levels can indicate a leak or a need for top-up. Keeping the lubricant level within the recommended range is essential for avoiding friction and wear.
   
2. Examine Lubricant Condition: Over time, lubricants can degrade and lose their effectiveness due to contamination, high temperatures, and pressure. Check the color and consistency of the lubricant. If the oil appears dark, gritty, or contaminated, it may be time for a change.
   
3. Change the Lubricant: The operator’s manual will specify the interval for changing the swing gear lubricant, typically after a set number of operating hours. For instance, lubricants may need to be changed every 500 to 1000 hours of operation. Always use the recommended lubricant type and ensure that the swing gear is adequately filled during the change.
   
4. Seal and Filter Inspection: During the lubricant change process, inspect the seals and filters for any damage or wear. Damaged seals can lead to leaks, and worn filters can allow contaminants into the lubrication system. Replacing these components during each oil change can prevent future issues.
   

Real-World Experience: Challenges with Swing Gear Lubrication
A common issue faced by operators and maintenance professionals is the failure to regularly check and replace swing gear lubricants. In one instance, a construction company operating several Kobelco excavators reported that one of their SK135SRLC-1E units experienced severe swing gear failure after neglecting regular maintenance. The lack of proper lubrication caused friction to build up, resulting in the metal components grinding against each other, leading to irreparable damage to the swing gear.
The breakdown led to significant downtime and costly repairs. The company had to replace the entire swing gear assembly, costing them both time and money. After this incident, the company implemented a more rigorous lubrication maintenance schedule to avoid such problems in the future. They now adhere to strict maintenance intervals and always use the recommended lubricants for their machines.
Tips for Preventing Swing Gear Issues

1. Regular Lubrication Checks: Perform lubrication checks at least once every 250 hours of operation to ensure the levels are adequate and the oil is still in good condition.
   
2. Use Quality Lubricants: Always use high-quality, manufacturer-recommended lubricants to protect the swing gear components. Low-quality or incorrect lubricants can cause unnecessary wear and premature failure.
   
3. Clean Environment: Work in cleaner environments to prevent dust and debris from contaminating the lubricant. Use proper sealing techniques to keep contaminants out of the swing gear housing.
   
4. Monitor Operational Conditions: Avoid heavy lifting or continuous rotation under extreme conditions without proper lubrication. Consider reducing the workload or ensuring more frequent maintenance during heavy-duty operations.
   

Conclusion: The Importance of Swing Gear Lubrication for the Kobelco SK135SRLC-1E
The swing gear system in the Kobelco SK135SRLC-1E is a crucial component that requires attention to detail during maintenance. Choosing the right lubricant, regularly inspecting the system, and following the manufacturer’s guidelines for lubricant changes are all essential for maintaining optimal performance and extending the lifespan of the excavator. Regular care and proper lubrication will ensure that the machine operates at peak efficiency, preventing costly breakdowns and improving overall productivity.
By following these simple yet vital steps, operators and maintenance crews can significantly reduce the risk of mechanical failure and keep the Kobelco SK135SRLC-1E running smoothly for years to come. Proper swing gear lubrication is not just a maintenance task—it is an investment in the longevity and reliability of your machinery.