This is a coolant expansion tank, also known as an overflow reservoir, for Volvo excavators, serving as a crucial component of the engine's cooling system. It is made from robust, impact-resistant plastic designed to withstand engine operating temperatures and coolant pressure, unlike a brittle or cracked original tank. Operators may observe coolant leaks around the tank, a drop in coolant level without obvious external leaks, or steam from the engine bay if the expansion tank is compromised.
Always verify with serial number before ordering.
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Cross-reference part number with serial number before ordering to confirm fitment. Keep original parts until new ones are confirmed correct. Record part numbers replaced for future reference.
Always consult the OEM service manual for model-specific torque values and procedures. WhatsApp our technical team if you need fitment guidance.
Visible coolant leaks originating from the expansion tank or a consistently low coolant level are the primary indicators of a problem. If left unaddressed, the engine can overheat due to insufficient coolant, leading to severe internal damage. A compromised tank can also lead to loss of system pressure, reducing the cooling efficiency.
Ensure the new tank is securely mounted to prevent vibration-induced stress fractures. Do not overfill the tank; fill to the indicated level when the engine is cool.
Check the radiator cap and all coolant hoses for signs of swelling, cracking, or leaks.