Description
When your tractor’s running hot and you notice coolant puddles under the radiator, chances are your cap isn’t holding pressure like it should. This radiator cap keeps your cooling system pressurized so coolant can absorb more heat without boiling over. If you’re losing coolant or dealing with overheating on hot days, a new cap might be all you need to get back to work.
What You’re Getting
- Direct replacement that maintains proper system pressure for efficient cooling
- Pressure relief valve prevents expensive damage from over-pressurization
- Vacuum valve recovers coolant from overflow as engine cools down
- Heavy-duty spring and rubber seal handle constant pressure cycles
- Built to handle the harsh environment around your radiator
Built for Real Farm Work
These caps fit your John Deere 40 and 50 series tractors—the workhorses that pull heavy tillage equipment, run grain carts during harvest, and power through long days in the field. Whether you’ve got a 4040 on loader duty or a 4250 pulling the planter, proper cooling keeps these powerful engines running when the work gets tough and temperatures climb.
Made to Last
A radiator cap lives in one of the hottest, most challenging spots on your tractor. This replacement uses quality materials that handle extreme heat, constant pressure changes, and exposure to coolant chemicals. The rubber seal stays flexible through temperature swings, and the spring maintains proper tension season after season.
Good to Know
Replace your cap if you see coolant residue around it, the rubber seal looks hard or cracked, or it won’t hold system pressure. A quick visual check during regular maintenance catches most problems before they leave you stranded. Keep a spare handy—caps tend to fail when you need your tractor most, like during harvest or planting season.
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