Pressure Relief Radiator Cap for John Deere 40 Series Tractors

Description

When you’re working hard on hot days and notice your coolant bubbling out or your temperature gauge climbing, chances are your radiator cap isn’t holding pressure like it should. This simple but critical part raises your coolant’s boiling point by about 45 degrees, keeping your John Deere running cool when the work gets tough. A worn cap that won’t seal properly leads to coolant loss, overheating, and poor heater performance – problems you don’t need when there’s work to do.

What You’re Getting

• Spring-loaded valve that maintains just the right system pressure for your 40 Series tractor
• Vacuum relief feature prevents radiator hose collapse as the engine cools down
• Quality gasket that creates a positive seal and resists coolant chemicals
• Safety release mechanism protects you from steam burns during removal

Built for Real Farm Work

Your John Deere 40 Series tractor – whether it’s a compact 940 for utility work, a versatile 2140 on the hay rake, or a powerful 3140 pulling heavy tillage equipment – generates serious heat under load. During peak seasons like planting, haying, or harvest, your cooling system works overtime. This pressure cap keeps coolant where it belongs instead of pushing out the overflow when things heat up.

Made to Last

This isn’t just a lid – it’s an engineered pressure control device with a calibrated spring that opens at exactly the right pressure. The high-quality rubber gasket resists compression and deterioration from coolant exposure, while the vacuum relief allows coolant recovery as the engine cools. Built to handle thousands of heat cycles without losing calibration.

Installation Notes

Never remove a radiator cap while the engine is hot – wait until it’s completely cool to avoid steam burns. Clean the radiator neck sealing surface and check for damage before installing. Push down and turn the new cap until it’s fully locked – proper seating is critical for the cap to function. If your tractor’s been overheating, try this simple fix first before assuming you need major cooling system work.