China HITACHI EX120-5 RADIATOR CAP (OEM HI 4343268) | Tonkee®

Pressure Rating: The cap is typically designed to withstand specific pressure levels within the cooling system.

In this case, it is engineered to manage the pressure associated with the Hitachi EX120-5's cooling system.

Material: Radiator caps are commonly made of high-quality materials such as durable plastic or metal. The exact material used may vary based on the manufacturer and model.

Size: The cap is designed to fit the radiator neck of the Hitachi EX120-5 excavator precisely. It should have a secure fit to prevent any coolant leaks.

Sealing Mechanism: Radiator caps usually have a sealing mechanism, such as a rubber gasket, to ensure a tight seal when the cap is in place. This seal is essential to maintain proper pressure and prevent coolant from escaping.

The primary function of the Hitachi EX120-5 Radiator Cap is to maintain the cooling system's pressure and regulate the flow of coolant. Here are its key functions:

Pressure Regulation: The cap helps regulate the pressure within the cooling system. It does this by allowing excess pressure to escape when it exceeds a certain threshold. This is crucial to prevent overheating and damage to the engine.

Coolant Circulation: The cap also facilitates the circulation of coolant between the radiator and the engine.

When the engine heats up, coolant expands and is pushed into the overflow or expansion tank. When the engine cools down, the cap allows coolant to be drawn back into the radiator, maintaining a consistent level of coolant in the system.

Sealing: One of the critical functions of the radiator cap is to create a tight seal to prevent coolant from leaking out. This seal ensures that the cooling system remains pressurized, which, in turn, raises the boiling point of the coolant, reducing the risk of overheating.

Safety: Radiator caps often feature a pressure relief valve. If the pressure within the cooling system becomes too high, the valve opens, allowing excess coolant and steam to escape harmlessly. This prevents catastrophic failures and protects the engine from damage.

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