Terex L20 Expansion Tanks: Importance, Functionality, and Replacement Options

[MikePhua]

Terex equipment, known for its robust construction machinery, is widely used across various industries, including mining, construction, and material handling. The Terex L20, a part of their compact equipment line, is one such machine that offers versatility and reliability. As with any complex machine, regular maintenance and component replacement are essential for ensuring peak performance. One of the vital components in the cooling system of the Terex L20 is the expansion tank. Understanding the role of expansion tanks and the process of their maintenance or replacement can help operators keep the machinery running smoothly.
What is an Expansion Tank?
An expansion tank, often referred to as an overflow tank, is an integral part of a machine’s cooling system. The primary purpose of the expansion tank is to maintain the correct pressure in the system and allow for the expansion of coolant as the engine heats up.
Key Functions of an Expansion Tank:

1. Pressure Regulation: As the engine heats up, the coolant expands. The expansion tank provides extra space for this coolant expansion, ensuring the pressure remains within safe limits.
   
2. Coolant Storage: In cases of coolant loss or overheating, the expansion tank stores the excess coolant, preventing air from entering the cooling system and keeping it sealed.
   
3. Preventing Overheating: By managing pressure and coolant levels, the expansion tank helps in preventing engine overheating, ensuring efficient operation even under heavy loads.
   
4. Air Removal: It helps remove air from the cooling system, preventing air pockets that could cause damage to the engine or other components.
   

In the case of the Terex L20, the expansion tank plays a crucial role in ensuring that the hydraulic and engine cooling systems operate smoothly, even in challenging work environments.
Common Issues with Expansion Tanks in the Terex L20
Over time, like all components, the expansion tank in the Terex L20 can wear out or fail due to various reasons. Some of the most common issues with expansion tanks in these machines include:

1. Cracks and Leaks: Prolonged exposure to high temperatures can cause the tank’s material, typically plastic or metal, to crack. Leaking coolant from these cracks can result in overheating and damage to the engine.
   
2. Pressure Build-Up: If the expansion tank’s cap or pressure relief valve is faulty, it can result in excessive pressure within the cooling system, causing damage to the radiator or hoses.
   
3. Corrosion: Over time, the materials inside the expansion tank, such as rubber seals or the tank itself, can corrode, especially if the coolant has not been replaced regularly or if the wrong type of coolant is used.
   
4. Coolant Contamination: A buildup of contaminants within the expansion tank can lead to blockages in the cooling system, reducing efficiency and possibly causing overheating.
   

How to Identify a Faulty Expansion Tank
To prevent more severe issues such as engine overheating or breakdown, it is important to be able to identify when an expansion tank is malfunctioning. Here are a few signs that the expansion tank in your Terex L20 might need attention:

1. Coolant Leaks: If you notice coolant pooling around the expansion tank or beneath the machine, it could indicate a leak in the tank.
   
2. Increased Engine Temperature: A sudden rise in engine temperature, especially under heavy loads, can be a sign of insufficient coolant or improper pressure regulation within the cooling system.
   
3. Coolant Overflow: If coolant is visibly overflowing from the expansion tank, it could indicate a failure in the pressure regulation system or that the tank is overfilled.
   
4. Corrosion or Damage: Visible signs of corrosion, especially around the tank’s inlet or outlet connections, are clear indicators of wear and tear.
   

Replacement of the Expansion Tank in the Terex L20
When the expansion tank in the Terex L20 fails, it is crucial to replace it promptly to avoid further damage to the engine or cooling system. The process of replacing the expansion tank can be straightforward, but it does require some attention to detail to ensure the correct replacement parts and proper installation.
Steps to Replace the Expansion Tank:

1. Preparation: Before beginning the replacement, make sure the machine is turned off and has had time to cool down. This helps to prevent burns from hot coolant or engine components.
   
2. Drain Coolant: If necessary, drain the coolant from the system to avoid spills when the old expansion tank is removed.
   
3. Remove the Old Tank: Loosen the connections to the expansion tank and remove any brackets or fasteners holding it in place. Carefully remove the old tank from its position.
   
4. Install the New Expansion Tank: Position the new expansion tank in place, ensuring all connections align correctly. Secure the tank with any required fasteners or brackets.
   
5. Refill Coolant: Once the new expansion tank is in place, refill the cooling system with the correct type and amount of coolant. Be sure to check for any air pockets by allowing the engine to run for a few minutes.
   
6. Test for Leaks: After installation, start the engine and allow it to reach operating temperature. Check the expansion tank and surrounding areas for any signs of leaks or irregularities.
   

Choosing the Right Aftermarket Expansion Tank
When replacing the expansion tank, some operators opt for aftermarket parts due to cost-effectiveness or availability. Aftermarket expansion tanks can provide the same functionality as the OEM (original equipment manufacturer) parts but at a reduced cost. However, it is important to ensure that the aftermarket parts meet the necessary specifications for your Terex L20.
Considerations for Choosing Aftermarket Parts:

• Compatibility: Ensure the expansion tank is compatible with the cooling system and engine specifications of your Terex L20.
  
• Material Quality: Look for tanks made from durable materials that can withstand the high temperatures and pressure found in the cooling system.
  
• Warranty: Some aftermarket parts come with a warranty, providing peace of mind in case of early failure.
  
• Reputation of Supplier: Choose suppliers with a good track record for providing quality parts, backed by positive reviews and customer feedback.
  

Preventing Future Issues with Expansion Tanks
Proper maintenance is key to extending the life of your expansion tank and overall cooling system. Here are a few tips for preventing issues in the future:

1. Regular Coolant Maintenance: Regularly check and replace the coolant to ensure it is free from contaminants and still performing at optimal levels.
   
2. Inspect the Cooling System: Periodically inspect all components of the cooling system, including the expansion tank, hoses, radiator, and cap, for signs of wear, leaks, or damage.
   
3. Pressure Relief Valve Check: Ensure that the pressure relief valve is functioning correctly. A malfunctioning valve can lead to overpressure and damage to the cooling system.
   
4. Use OEM Coolant: Always use the recommended coolant type for your Terex L20. Using incorrect or poor-quality coolant can accelerate the deterioration of the expansion tank and other cooling system components.
   

Conclusion
The expansion tank is a vital part of the Terex L20’s cooling system, ensuring that the engine runs at the correct temperature and pressure. By understanding its role, recognizing signs of failure, and using proper maintenance practices, you can help extend the life of your machine and avoid costly repairs. Whether opting for OEM or aftermarket expansion tanks, choosing high-quality parts and performing regular checks will keep your Terex L20 in top working condition.