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Radiator cap

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Radiator Caps for Excavators and Heavy Equipment

Find a replacement radiator cap for selected excavators and heavy equipment at Fab Heavy Parts. A radiator cap is an important component of a compatible pressurized engine cooling system, helping maintain the specified cooling-system pressure while allowing pressure relief according to its design.

Our radiator cap listings include replacement options for selected Hitachi, Komatsu, Kobelco, Caterpillar, Takeuchi, and John Deere equipment applications. Different machines may require different cap designs, pressure ratings, and sealing arrangements.

Replacement Radiator Caps for Excavator Applications

Available radiator cap listings cover a variety of excavator models and cooling-system configurations.

For example, radiator cap reference 4650360 is listed for selected Hitachi excavators, including ZX110-3, ZX120-3, and ZX130-3 applications. Another product, reference 19113-00078, is listed for Takeuchi TB, TW, and TL series equipment.

Additional radiator cap options are listed for Komatsu PC-series excavators, Kobelco SK-series machines, and selected Caterpillar E-series excavators.

These examples illustrate the range of equipment applications represented in our radiator cap products. Compatibility must be confirmed for each individual machine rather than assumed across an entire model family.

What to Check When Choosing a Radiator Cap

Selecting the correct radiator cap involves more than matching its outside appearance.

Check the original cap's part number, specified pressure rating, neck dimensions, locking design, and sealing arrangement. A replacement with an incorrect pressure specification or incompatible sealing surface may prevent the cooling system from operating as intended.

Use your equipment's parts manual and cooling-system specifications to confirm the correct replacement. If the original cap has no readable identification, check the equipment model and serial number against the manufacturer's parts information.

Radiator Cap Replacement and Cooling System Maintenance

Radiator caps should be inspected when there are signs of coolant leakage around the filler neck, damaged seals, or suspected pressure-control problems.

Because radiator caps operate within a pressurized cooling system, never remove a cap while the engine or coolant is hot. Follow the equipment manufacturer's cooling-system inspection and replacement procedures.

If your repair also involves a damaged radiator assembly, explore our radiator replacement parts for related cooling-system components.

Need Help Finding the Right Radiator cap?

Can't find the replacement part you need? Send FAB Heavy Parts your part number, engine model, or equipment details. Our team can help review your requirements and provide a quotation.

Request a Quote

Frequently Asked Questions

How do I know which radiator cap fits my excavator?

Start by checking the part number on your original radiator cap and your excavator's model and serial number. You should also confirm the required pressure rating, cap dimensions, and sealing design. Even if two caps look alike, they may not be interchangeable. We recommend checking the equipment's parts manual before selecting a replacement.

Can I use a radiator cap with a different pressure rating?

We recommend using the pressure rating specified by your equipment manufacturer. A cap with an incorrect rating may change how the cooling system maintains or releases pressure. Do not select a higher- or lower-pressure cap simply because it fits the radiator opening.

What should I do if the part number on my old radiator cap is missing or unreadable?

You can use your machine's manufacturer, model, and serial number to look up the specified radiator cap in the equipment parts manual. You should also confirm the required pressure rating and filler-neck design. If the information is incomplete, gather clear photos and measurements of the original cap and radiator neck before choosing a replacement.

How can I tell if my excavator's radiator cap needs replacing?

Visible damage to the cap's seal, corrosion, or coolant leakage around the filler neck may indicate a problem. However, overheating or coolant loss can also have other causes. We recommend inspecting the cooling system and having the cap pressure-tested using the appropriate equipment when necessary.

What should I check before installing a replacement radiator cap?

Make sure the engine and cooling system are completely cool before removing the original cap. Check the radiator filler neck and sealing surfaces for damage or contamination, and confirm that the replacement matches the required specifications. Follow your equipment manufacturer's instructions for installation and cooling-system inspection.

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