Description

If you’ve noticed your vintage John Deere running a little warmer than it should, or you’re seeing coolant drops under the tractor after a hard day’s work, that old radiator cap might be the culprit. These Tisco caps are direct replacements for John Deere part AA5757R, and they’re built to handle the pressure these older tractors need to keep their cooling systems working right. A proper sealing cap keeps your coolant where it belongs and your engine running at the right temperature.

What You’re Getting

Includes a fresh gasket for a leak-proof seal from day one
Built for pressurized cooling systems that maintain proper operating temperature
Direct replacement design – no modifications needed, just unscrew the old and thread on the new
Proper venting prevents vacuum buildup while maintaining system pressure
Heavy-duty construction that stands up to the heat cycles these vintage engines produce

Built for Real Farm Work

This cap fits a whole range of John Deere vintage iron from the 1940s through the 1960s. Whether you’re running a Model 50 for light chores, working ground with a 70 or 80, or handling bigger jobs with a 420 through 830, this cap keeps your cooling system sealed up tight. These tractors were built when things were made to last, and this replacement cap follows that same philosophy.

Made to Last

The pressurized cooling systems on these older tractors run different pressure specs than modern machines, and this cap is designed specifically for those requirements. The gasket stays flexible through temperature changes, and the cap itself handles the expansion and contraction that comes with decades of heating up and cooling down.

Installation Notes

Installation takes just a few seconds – spin off the old cap and thread on the new one. If your old cap has been stuck for years, a little penetrating oil around the threads makes removal easier. While you’ve got the cap off, take a peek inside the radiator to check coolant level and condition – it’s a good time to top off or change if needed.