4240423M Komatsu EXPANSION TANK

This thing holds extra coolant for your engine. Coolant, as you probably know, circulates through the engine to keep it from overheating. As the engine heats up, that coolant expands—that’s just physics. The expansion tank gives that expanded coolant somewhere to go, prevents pressure building up in the system. It also provides coolant back into the radiator as the engine cools down and the fluid contracts. Essentially it manages the volume changes in your cooling system. It’s part of the cooling system, specifically connected to the radiator usually through a hose. It's a sealed unit, meaning it holds pressure. It doesn’t make the coolant circulate—the water pump does that—but it's a critical piece in maintaining the proper coolant level and pressure. Think of it as a safety valve and a reservoir all in one. It works with the radiator cap to keep everything at the right pressure. If the expansion tank fails, you can run into a lot of trouble. A cracked or leaking tank means you're losing coolant, and that leads to overheating, which can cause serious engine damage. You’ll notice if it's failing—you might see coolant leaking, or the engine temperature gauge creeping up. It acts like a shield against pressure build – up, so if that shield goes, things get risky fast. Ignoring it can lead to a blown head gasket or worse. You can find a replacement pretty easily, places like Fixparts Online usually have a good selection, and it’s often something a reasonably handy person can replace themselves. Eco-friendly and safe: Expansion Tank (MPN 4240423M) comes with a 12-month warranty!

About Komatsu

Komatsu provides innovative and reliable machinery solutions designed to withstand the harshest conditions in construction and mining.

Why Choose Komatsu?

• Komatsu parts are built to last, meaning less downtime and more work getting done. • Our parts are designed specifically for Komatsu equipment, ensuring a perfect fit and optimal performance. • We have a huge inventory of parts, so you can get what you need quickly. • Genuine Komatsu parts help maintain your machine’s value and protect your investment. Drive with confidence – choose Komatsu parts at FixParts Online.