3CX, 4CX
Excavators, Forklifts, Wheeled Loaders, Telescopic Handlers, Generators
The thermostat is the "brain" of the cooling system. It regulates the flow of coolant to maintain the optimal engine operating temperature. If your machine is overheating, or conversely, cannot reach the proper operating temperature (engine is underheated), or the temperature gauge is fluctuating wildly, these are classic symptoms of a faulty thermostat. A thermostat stuck in the closed position leads to overheating and a blown head gasket, while one stuck in the open position leads to increased fuel consumption and accelerated engine wear.
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Original JCB Quality
Guarantee of the highest protection
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Precise Opening Temperature
Optimal engine operating temperature
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High Durability
Corrosion resistance
Only an original thermostat guarantees the parameters that effectively protect the DieselMax engine and its components from overheating or underheating.
Using original consumable parts is often a condition for maintaining the warranty and positively affects the machine's resale value.
Using original parts is the best way to avoid unforeseen breakdowns and costly downtime.
Installing a new thermostat on an old, deformed gasket is a guarantee of an immediate leak. Always use a new housing gasket.
While replacing the thermostat, inspect the tension of the serpentine belt and check for any leaks from the water pump. This is a perfect time for a comprehensive cooling system service.
After replacement and refilling the system with new coolant (e.g., HYPTRON), the cooling system must be thoroughly bled according to the service manual to avoid engine overheating.
Answer: It is one of the most common causes. Other possibilities include a faulty water pump, a clogged radiator, a malfunctioning fan, or a low coolant level. Replacing the thermostat is the simplest and cheapest diagnostic step.
Question: My machine's engine is constantly underheated. Is the thermostat also to blame?Answer: Yes. This means the thermostat is stuck in the open position, and the coolant is constantly circulating in the large circuit, preventing the engine from reaching its optimal operating temperature.
Question: Can I use a replacement?Answer: The DieselMax engine is sensitive to the precision of the cooling system. If you are looking for a proven and safe alternative to an original part, choose only replacements from reputable brands, such as REDX, which guarantee parameters compliant with the original.
If you are unsure whether the selected product is suitable for your machine, contact us and we will help you choose the right part and provide practical advice in minutes.
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